METHOD FOR OBTAINING ENCAPSULATED NANOPARTICLES

Abstract

A method for obtaining at least one particle, including: (a) preparing solution A including at least one precursor of at least one of Si, B, P, Ge, As, Al, Fe, Ti, Zr, Ni, Zn, Ca, Na, Ba, K, Mg, Pb, Ag, V, Te, Mn, Ir, Sc, Nb, Sn, Ce, Be, Ta, S, Se, N, F, and Cl; (b) preparing aqueous solution B; (c) forming droplets of solution A; (d) forming droplets of solution B; (e) mixing droplets; (f) dispersing mixed droplets in a gas flow; (g) heating dispersed droplets to obtain the at least one particle; (h) cooling the at least one particle; and (i) separating and collecting the at least one particle. The aqueous solution is acidic, neutral, or basic. In step (a) and/or step (b) at least one colloidal suspension of a plurality of nanoparticles is mixed with the solution. Also, a device for implementing the method.

Claims

1-16. (canceled)

17. A method for obtaining at least one particle comprising the following steps: (a) preparing a solution A comprising at least one precursor of at least one element selected from the group constituted by silicon, boron, phosphorus, germanium, arsenic, aluminium, iron, titanium, zirconium, nickel, zinc, calcium, sodium, barium, potassium, magnesium, lead, silver, vanadium, tellurium, manganese, iridium, scandium, niobium, tin, cerium, beryllium, tantalum, sulfur, selenium, nitrogen, fluorine, chlorine, the at least one precursor of at least one element being the precursor of an inorganic material; (b) preparing an aqueous solution B; (c) forming droplets of solution A by a first means for forming droplets; (d) forming droplets of solution B by a second means for forming droplets; (e) mixing said droplets; (f) dispersing the mixed droplets in a gas flow; (g) heating said dispersed droplets at a temperature sufficient to obtain the at least one particle; (h) cooling of said at least one particle; and (i) separating and collecting said at least one particle; wherein the aqueous solution may be acidic, neutral, or basic; wherein at least one colloidal suspension comprising a plurality of nanoparticles is mixed with the solution A at step (a) and/or with the solution B at step (b); and wherein the nanoparticles are inorganic nanoparticles.

18. The method for obtaining at least one particle according to claim 17, wherein at least one precursor of at least one heteroelement selected from the group constituted by cadmium, sulfur, selenium, indium, tellurium, mercury, tin, copper, nitrogen, gallium, antimony, thallium, molybdenum, palladium, cerium, tungsten, cobalt, manganese, silicon, boron, phosphorus, germanium, arsenic, aluminium, iron, titanium, zirconium, nickel, zinc, calcium, sodium, barium, potassium, magnesium, lead, vanadium, silver, beryllium, iridium, scandium, niobium or tantalum is added to solution A at step (a) and/or to solution B at step (b).

19. The method according to claim 17, wherein the droplets are formed by spray-drying or spray-pyrolysis.

20. The method according to claim 17, wherein the droplets of solution A and solution B are simultaneously formed.

21. The method according to claim 17, wherein the droplets of solution A are formed prior to or after the formation of droplets of solution B.

22. The method according to claim 17, wherein the droplets of solution B or solution A are replaced by vapors of solution B or solution A respectively.

23. The method according to claim 17, wherein the nanoparticles are luminescent, preferably the luminescent nanoparticles are semiconductor nanocrystals comprising a core comprising a material of formula M.sub.xN.sub.yE.sub.zA.sub.w, wherein: M is selected from the group consisting of Zn, Cd, Hg, Cu, Ag, Au, Ni, Pd, Pt, Co, Fe, Ru, Os, Mn, Tc, Re, Cr, Mo, W, V, Nd, Ta, Ti, Zr, Hf, Be, Mg, Ca, Sr, Ba, Al, Ga, In, Tl, Si, Ge, Sn, Pb, As, Sb, Bi, Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Cs or a mixture thereof; N is selected from the group consisting of Zn, Cd, Hg, Cu, Ag, Au, Ni, Pd, Pt, Co, Fe, Ru, Os, Mn, Tc, Re, Cr, Mo, W, V, Nd, Ta, Ti, Zr, Hf, Be, Mg, Ca, Sr, Ba, Al, Ga, In, Tl, Si, Ge, Sn, Pb, As, Sb, Bi, Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Cs or a mixture thereof; E is selected from the group consisting of O, S, Se, Te, C, N, P, As, Sb, F, Cl, Br, I, or a mixture thereof; A is selected from the group consisting of O, S, Se, Te, C, N, P, As, Sb, F, Cl, Br, I, or a mixture thereof; and x, y, z and w are independently a decimal number from 0 to 5; x, y, z and w are not simultaneously equal to 0; x and y are not simultaneously equal to 0; z and w may not be simultaneously equal to 0.

24. The method according to claim 23, wherein the semiconductor nanocrystals comprise at least one shell comprising a material of formula M.sub.xN.sub.yE.sub.zA.sub.w, wherein: M is selected from the group consisting of Zn, Cd, Hg, Cu, Ag, Au, Ni, Pd, Pt, Co, Fe, Ru, Os, Mn, Tc, Re, Cr, Mo, W, V, Nd, Ta, Ti, Zr, Hf, Be, Mg, Ca, Sr, Ba, Al, Ga, In, Tl, Si, Ge, Sn, Pb, As, Sb, Bi, Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Cs or a mixture thereof; N is selected from the group consisting of Zn, Cd, Hg, Cu, Ag, Au, Ni, Pd, Pt, Co, Fe, Ru, Os, Mn, Tc, Re, Cr, Mo, W, V, Nd, Ta, Ti, Zr, Hf, Be, Mg, Ca, Sr, Ba, Al, Ga, In, Tl, Si, Ge, Sn, Pb, As, Sb, Bi, Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Cs or a mixture thereof; E is selected from the group consisting of O, S, Se, Te, C, N, P, As, Sb, F, Cl, Br, I, or a mixture thereof; A is selected from the group consisting of O, S, Se, Te, C, N, P, As, Sb, F, Cl, Br, I, or a mixture thereof; and x, y, z and w are independently a decimal number from 0 to 5; x, y, z and w are not simultaneously equal to 0; x and y are not simultaneously equal to 0; z and w may not be simultaneously equal to 0.

25. The method according to claim 23, wherein the semiconductor nanocrystals comprise at least one crown comprising a material of formula M.sub.xN.sub.yE.sub.zA.sub.w, wherein: M is selected from the group consisting of Zn, Cd, Hg, Cu, Ag, Au, Ni, Pd, Pt, Co, Fe, Ru, Os, Mn, Tc, Re, Cr, Mo, W, V, Nd, Ta, Ti, Zr, Hf, Be, Mg, Ca, Sr, Ba, Al, Ga, In, Tl, Si, Ge, Sn, Pb, As, Sb, Bi, Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Cs or a mixture thereof; N is selected from the group consisting of Zn, Cd, Hg, Cu, Ag, Au, Ni, Pd, Pt, Co, Fe, Ru, Os, Mn, Tc, Re, Cr, Mo, W, V, Nd, Ta, Ti, Zr, Hf, Be, Mg, Ca, Sr, Ba, Al, Ga, In, Tl, Si, Ge, Sn, Pb, As, Sb, Bi, Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Cs or a mixture thereof; E is selected from the group consisting of O, S, Se, Te, C, N, P, As, Sb, F, Cl, Br, I, or a mixture thereof; A is selected from the group consisting of O, S, Se, Te, C, N, P, As, Sb, F, Cl, Br, I, or a mixture thereof; and x, y, z and w are independently a decimal number from 0 to 5; x, y, z and w are not simultaneously equal to 0; x and y are not simultaneously equal to 0; z and w may not be simultaneously equal to 0.

26. The method according to claim 23, wherein the semiconductor nanocrystals are semiconductor nanoplatelets.

27. A particle obtained by the method according to claim 17, wherein said obtained particle comprises a plurality of nanoparticles encapsulated in an inorganic material.

28. A particle obtainable by the method according to claim 17, wherein said obtainable particle comprises a plurality of nanoparticles encapsulated in an inorganic material, wherein the plurality of nanoparticles is uniformly dispersed in said inorganic material.

29. A device for implementing the method according to claim 17, said device comprising: at least one gas supply; a first means for forming droplets of a first solution; a second means for forming droplets of a second solution; an optional means for forming reactive vapors of a third solution; an optional means for releasing gas; a tube; means for heating the droplets to obtain at least one particle; means for cooling the at least one particle; means for separating and collecting the at least one particle; and a pumping device; and connecting means.

30. The device according to claim 29, wherein the means for forming droplets are located and are working in a series or in parallel.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[1673] FIG. 1 illustrates a particle 1 comprising a plurality of nanoparticles 3 encapsulated in an inorganic material 2.

[1674] FIG. 2 illustrates a particle 1 comprising a plurality of spherical nanoparticles 31 encapsulated in an inorganic material 2.

[1675] FIG. 3 illustrates a particle 1 comprising a plurality of 2D nanoparticles 32 encapsulated in an inorganic material 2.

[1676] FIG. 4 illustrates a particle 1 comprising a plurality of spherical nanoparticles 31 and a plurality of 2D nanoparticles 32 encapsulated in an inorganic material 2.

[1677] FIG. 5 illustrates different types of nanoparticles 3.

[1678] FIG. 5A illustrates a core nanoparticle 33 without a shell.

[1679] FIG. 5B illustrates a core 33/shell 34 nanoparticle 3 with one shell 34.

[1680] FIG. 5C illustrates a core 33/shell (34, 35) nanoparticle 3 with two different shells (34, 35).

[1681] FIG. 5D illustrates a core 33/shell (34, 35, 36) nanoparticle 3 with two different shells (34, 35) surrounded by an oxide insulator shell 36.

[1682] FIG. 5E illustrates a core 33/crown 37 2D nanoparticle 32.

[1683] FIG. 5F illustrates a core 33/shell 34 2D nanoparticle 32 with one shell 34.

[1684] FIG. 5G illustrates a core 33/shell (34, 35) 2D nanoparticle 32 with two different shells (34, 35).

[1685] FIG. 5H illustrates a core 33/shell (34, 35, 36) 2D nanoparticle 32 with two different shells (34, 35) surrounded by an oxide insulator shell 36.

[1686] FIG. 6 illustrates a device 4 for implementing the method of the invention comprising a gas supply 41; a first means for forming droplets of a first solution 42; a second means for forming droplets of a second solution 43; a tube 441; means for heating the droplets to obtain at least one particle 44; means for cooling the at least one particle 46; means for separating and collecting the at least one particle 47; a pumping device 48; and connecting means 45.

[1687] FIG. 7 illustrates a device 4 for implementing the method of the invention comprising two gas supplies (411, 412); a first means for forming droplets of a first solution 42; a second means for forming droplets of a second solution 43; a tube 441; means for heating the droplets to obtain at least one particle 44; means for cooling the at least one particle 46; means for separating and collecting the at least one particle 47; a pumping device 48; and connecting means 45.

[1688] FIG. 8 illustrates an industrial device 4 for implementing the method of the invention comprising two gas supplies (411, 412); two valves 413; a first means for forming droplets of a first solution 42; a second means for forming droplets of a second solution 43; two resulting sprays of droplets (421, 431); a mixing chamber 5; means for heating the droplets to obtain at least one particle 44; means for cooling the at least one particle 46; means for separating and collecting the at least one particle 47; a pumping device 48; and connecting means 45.

[1689] FIG. 9 illustrates a first means for forming droplets 42 of a first solution and a second means for forming droplets 43 of a second solution.

[1690] FIG. 9A illustrates a first means for forming droplets 42 of a first solution and a second means for forming droplets 43 of a second solution working in series.

[1691] FIG. 9B illustrates a first means for forming droplets 42 of a first solution and a second means for forming droplets 43 of a second solution working in parallel.

[1692] FIG. 9C illustrates a first means for forming droplets 42 of a first solution and a container 49 comprising a solution capable of producing reactive vapors working in series.

[1693] FIG. 9D illustrates a first means for forming droplets 42 of a first solution and a container 49 comprising a solution capable of producing reactive vapors working in parallel.

[1694] FIG. 10 illustrates a first means for forming droplets 42 of a first solution, a second means for forming droplets 43 of a second solution and a container 49 comprising a solution capable of producing reactive vapors working in series.

[1695] FIG. 11 is TEM images showing obtained particles 1 comprising nanoparticles (dark contrast) uniformly dispersed in an inorganic material (bright contrast).

[1696] FIG. 11A is a TEM image showing CdSe/CdZnS nanoplatelets (dark contrast) uniformly dispersed in SiO.sub.2 (bright contrast@ SiO.sub.2).

[1697] FIG. 11B is a TEM image showing CdSe/CdZnS nanoplatelets (dark contrast) uniformly dispersed in SiO.sub.2 (bright contrast@ SiO.sub.2).

[1698] FIG. 11C is a TEM image showing CdSe/CdZnS nanoplatelets (dark contrast) uniformly dispersed in Al.sub.2O.sub.3(bright contrast@Al.sub.2O.sub.3).

[1699] FIG. 11D is a TEM image showing obtained particles 1 comprising nanoparticles (dark contrast) uniformly dispersed in an inorganic material (bright contrast) produced by using water vapor.

[1700] FIG. 11E is a TEM image showing Fe.sub.3O.sub.4 nanoparticles (dark contrast) uniformly dispersed in Al.sub.2O.sub.3(bright contrast@Al.sub.2O.sub.3).

[1701] FIG. 12 illustrates a particle 1 comprising a core 11 comprising a plurality of nanoparticles 32 encapsulated in an inorganic material 2, and a shell 12 comprising a plurality of nanoparticles 31 encapsulated in an inorganic material 21.

[1702] FIG. 13 is a set of 4 transmission electron microscopy (TEM) images.

[1703] FIGS. 13A-B show InP/ZnS@SiO.sub.2 prepared by reverse microemulsion.

[1704] FIGS. 13C-D show CdSe/CdS/ZnS@SiO.sub.2 prepared as detailed in Example 26.

[1705] FIG. 14 shows the N.sub.2 adsorption isotherm of composite particles 1.

[1706] FIG. 14A shows the N.sub.2 adsorption isotherm of composite particles 1 CdSe/CdZnS@ SiO.sub.2 prepared from a basic aqueous solution and from an acidic solution.

[1707] FIG. 14B shows the N.sub.2 adsorption isotherm of composite particles 1 CdSe/CdZnS@ Al.sub.2O.sub.3 obtained by heating droplets at 150 C., 300 C. and 550 C.

EXAMPLES

[1708] The present invention is further illustrated by the following examples.

Example 1: Inorganic Nanoparticles Preparation

[1709] Nanoparticles used in the examples herein were prepared according to methods of the art (Lhuillier E. et al., Acc. Chem. Res., 2015, 48 (1), pp 22-30; Pedetti S. et al., J. Am. Chem. Soc., 2014, 136 (46), pp 16430-16438; Ithurria S. et al., J. Am. Chem. Soc., 2008, 130, 16504-16505; Nasilowski M. et al., Chem. Rev. 2016, 116, 10934-10982).

[1710] Nanoparticles used in the examples herein were selected in the group comprising CdSe/CdZnS, CdSe, CdS, CdTe, CdSe/CdS, CdSe/ZnS, CdSe/CdZnS, CdS/ZnS, CdS/CdZnS, CdTe/ZnS, CdTe/CdZnS, CdSeS/ZnS, CdSeS/CdS, CdSeS/CdZnS, CuInS.sub.2/ZnS, CuInSe.sub.2/ZnS, InP/CdS, InP/ZnS, InZnP/ZnS, InP/ZnSeS, InP/ZnSe, InP/CdZnS, CdSe/CdZnS/ZnS, CdSe/ZnS/CdZnS, CdSe/CdS/ZnS, CdSe/CdS/CdZnS, CdSe/ZnSe/ZnS, CdSeS/CdS/ZnS, CdSeS/CdS/CdZnS, CdSeS/CdZnS/ZnS, CdSeS/ZnSe/ZnS, CdSeS/ZnSe/CdZnS, CdSeS/ZnS/CdZnS, CdS e/ZnS/CdS, CdSeS/ZnS/CdS, CdS e/ZnSe/CdZnS, InP/ZnSe/ZnS, InP/CdS/ZnS e/ZnS, InP/CdS/ZnS, InP/ZnS/CdS, InP/GaP/ZnS, InP/GaP/ZnSe, InP/CdZnS/ZnS, InP/ZnS/CdZnS, InP/CdS/CdZnS, InP/ZnSe/CdZnS, InP/ZnS/ZnSe, InP/GaP/ZnSe/ZnS, InP/ZnS/ZnSe/ZnS, nanoplatelets or quantum dots.

Example 2: Exchange Ligands for Phase Transfer in Basic Aqueous Solution

[1711] 100 L of CdSe/CdZnS nanoplatelets suspended in heptane were mixed with 3-mercaptopropionic acid and heated at 60 C. for several hours. The nanoparticles were then precipitated by centrifugation and redispersed in dimethylformamide Potassium tert-butoxide were added to the solution before adding ethanol and centrifugate. The final colloidal nanoparticles were redispersed in water.

Example 3: Exchange Ligands for Phase Transfer in Acidic Aqueous Solution

[1712] 100 L of CdSe/CdZnS nanoplatelets suspended in a basic aqueous solution were mixed with ethanol and centrifugated. A PEG-based polymer was solubilized in water and added to the precipitated nanoplatelets. Acetic acid was dissolved in the colloidal suspension to control the acidic pH.

Example 4: Composite Particles Preparation from a Basic Aqueous SolutionCdSe/CdZnS@SiO.SUB.2

[1713] 100 L of CdSe/CdZnS nanoplatelets suspended in a basic aqueous solution were mixed with a basic aqueous solution of TEOS at 0.13M previously hydrolyzed for 24 hours, then loaded on a spray-drying set-up. The liquid mixture was sprayed towards a tube furnace heated at a temperature ranging from the boiling point of the solvent to 1000 C. with a nitrogen flow. The composite particles were collected at the surface of a filter.

[1714] FIG. 11A-B show TEM images of the resulting particles.

[1715] FIG. 14A shows the N.sub.2 adsorption isotherm of the resulting particles. Said resulting particles are porous.

[1716] The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with CdSe, CdS,

[1717] CdTe, CdSe/CdS, CdSe/ZnS, CdSe/CdZnS, CdS/ZnS, CdS/CdZnS, CdTe/ZnS, CdTe/CdZnS, CdSeS/ZnS, CdSeS/CdS, CdSeS/CdZnS, CuInS.sub.2/ZnS, CuInSe.sub.2/ZnS, InP/CdS, InP/ZnS, InZnP/ZnS, InP/ZnSeS, InP/ZnSe, InP/CdZnS, CdSe/CdZnS/ZnS, CdSe/ZnS/CdZnS, CdSe/CdS/ZnS, CdSe/CdS/CdZnS, CdSe/ZnS e/ZnS, CdSeS/CdS/ZnS, CdSeS/CdS/CdZnS, CdSeS/CdZnS/ZnS, CdSeS/ZnSe/ZnS, CdSeS/ZnSe/CdZnS, CdSeS/ZnS/CdZnS, CdSe/ZnS/CdS, CdSeS/ZnS/CdS, CdS e/ZnSe/CdZnS, InP/ZnS e/ZnS, InP/CdS/ZnSe/ZnS, InP/CdS/ZnS, InP/ZnS/CdS, InP/GaP/ZnS, InP/GaP/ZnSe, InP/CdZnS/ZnS, InP/ZnS/CdZnS, InP/CdS/CdZnS, InP/ZnSe/CdZnS, InP/ZnS/ZnSe, InP/GaP/ZnSe/ZnS, InP/ZnS/ZnSe/ZnS, nanoplatelets or quantum dots, or a mixture thereof.

[1718] The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with organic nanoparticles, inorganic nanoparticles such as metal nanoparticles, halide nanoparticles, chalcogenide nanoparticles, phosphide nanoparticles, sulfide nanoparticles, metalloid nanoparticles, metallic alloy nanoparticles, phosphor nanoparticles, perovskite nanoparticles, ceramic nanoparticles such as for example oxide nanoparticles, carbide nanoparticles, nitride nanoparticles, or a mixture thereof.

Example 5: Composite Particles Preparation from an Acidic Aqueous SolutionCdSe/CdZnS@SiO.SUB.2

[1719] 100 L of CdSe/CdZnS nanoplatelets suspended in an acidic aqueous solution were mixed with an acidic aqueous solution of TEOS at 0.13M previously hydrolyzed for 24 hours, then loaded on a spray-drying set-up. The liquid mixture was sprayed towards a tube furnace heated at a temperature ranging from the boiling point of the solvent to 1000 C. with a nitrogen flow. The composite particles were collected at the surface of a filter.

[1720] FIG. 14A shows the N.sub.2 adsorption isotherm of the resulting particles. Said resulting particles are not porous.

[1721] The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with CdSe, CdS, CdTe, CdSe/CdS, CdSe/ZnS, CdSe/CdZnS, CdS/ZnS, CdS/CdZnS, CdTe/ZnS, CdTe/CdZnS, CdSeS/ZnS, CdSeS/CdS, CdSeS/CdZnS, CuInS.sub.2/ZnS, CuInSe.sub.2/ZnS, InP/CdS, InP/ZnS, InZnP/ZnS, InP/ZnSeS, InP/ZnSe, InP/CdZnS, CdSe/CdZnS/ZnS, CdSe/ZnS/CdZnS, CdSe/CdS/ZnS, CdSe/CdS/CdZnS, CdSe/ZnS e/ZnS, CdSeS/CdS/ZnS, CdSeS/CdS/CdZnS, CdSeS/CdZnS/ZnS, CdSeS/ZnSe/ZnS, CdSeS/ZnSe/CdZnS, CdSeS/ZnS/CdZnS, CdSe/ZnS/CdS, CdSeS/ZnS/CdS, CdS e/ZnSe/CdZnS, InP/ZnS e/ZnS, InP/CdS/ZnSe/ZnS, InP/CdS/ZnS, InP/ZnS/CdS, InP/GaP/ZnS, InP/GaP/ZnSe, InP/CdZnS/ZnS, InP/ZnS/CdZnS, InP/CdS/CdZnS, InP/ZnSe/CdZnS, InP/ZnS/ZnSe, InP/GaP/ZnSe/ZnS, InP/ZnS/ZnSe/ZnS, nanoplatelets or quantum dots, or a mixture thereof.

[1722] The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with organic nanoparticles, inorganic nanoparticles such as metal nanoparticles, halide nanoparticles, chalcogenide nanoparticles, phosphide nanoparticles, sulfide nanoparticles, metalloid nanoparticles, metallic alloy nanoparticles, phosphor nanoparticles, perovskite nanoparticles, ceramic nanoparticles such as for example oxide nanoparticles, carbide nanoparticles, nitride nanoparticles, or a mixture thereof.

Example 6: Composite Particles Preparation from a Basic Aqueous Solution with Hetero-ElementsCdSe/CdZnS@Si.SUB.x.Cd.SUB.y.Zn.SUB.z.O.SUB.w

[1723] 100 L of CdSe/CdZnS nanoplatelets suspended in an acidic aqueous solution were mixed with an acidic aqueous solution of TEOS at 0.13M previously hydrolyzed for 24 hours in presence of cadmium acetate at 0.01M and zinc oxide at 0.01M, then loaded on a spray-drying set-up. The liquid mixture was sprayed towards a tube furnace heated at a temperature ranging from the boiling point of the solvent to 1000 C. with a nitrogen flow. The composite particles were collected at the surface of a filter.

[1724] The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with CdSe, CdS, CdTe, CdSe/CdS, CdSe/ZnS, CdSe/CdZnS, CdS/ZnS, CdS/CdZnS, CdTe/ZnS, CdTe/CdZnS, CdSeS/ZnS, CdSeS/CdS, CdSeS/CdZnS, CuInS.sub.2/ZnS, CuInSe.sub.2/ZnS, InP/CdS, InP/ZnS, InZnP/ZnS, InP/ZnSeS, InP/ZnSe, InP/CdZnS, CdSe/CdZnS/ZnS, CdSe/ZnS/CdZnS, CdSe/CdS/ZnS, CdSe/CdS/CdZnS, CdSe/ZnS e/ZnS, CdSeS/CdS/ZnS, CdSeS/CdS/CdZnS, CdSeS/CdZnS/ZnS, CdSeS/ZnSe/ZnS, CdSeS/ZnSe/CdZnS, CdSeS/ZnS/CdZnS, CdSe/ZnS/CdS, CdSeS/ZnS/CdS, CdS e/ZnSe/CdZnS, InP/ZnS e/ZnS, InP/CdS/ZnSe/ZnS, InP/CdS/ZnS, InP/ZnS/CdS, InP/GaP/ZnS, InP/GaP/ZnSe, InP/CdZnS/ZnS, InP/ZnS/CdZnS, InP/CdS/CdZnS, InP/ZnSe/CdZnS, InP/ZnS/ZnSe, InP/GaP/ZnSe/ZnS, InP/ZnS/ZnSe/ZnS, nanoplatelets or quantum dots, or a mixture thereof.

[1725] The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with organic nanoparticles, inorganic nanoparticles such as metal nanoparticles, halide nanoparticles, chalcogenide nanoparticles, phosphide nanoparticles, sulfide nanoparticles, metalloid nanoparticles, metallic alloy nanoparticles, phosphor nanoparticles, perovskite nanoparticles, ceramic nanoparticles such as for example oxide nanoparticles, carbide nanoparticles, nitride nanoparticles, or a mixture thereof.

Example 7: Composite Particles Preparation from an Organic Solution and an Aqueous SolutionCdSe/CdZnS @Al.SUB.2.O.SUB.3

[1726] 100 L of CdSe/CdZnS nanoplatelets suspended in heptane were mixed with aluminium tri-sec butoxide and 5 mL of pentane, then loaded on a spray-drying set-up. On another side, a basic aqueous solution was prepared and loaded the same spray-drying set-up, but at a different location than the first heptane solution. The two liquids were sprayed simultaneously towards a tube furnace heated at a temperature ranging from the boiling point of the solvent to 1000 C. with a nitrogen flow. The composite particles were collected at the surface of a filter.

[1727] FIG. 11C shows TEM images of the resulting particles.

[1728] FIG. 14B show N.sub.2 adsorption isotherms for particles obtained after heating the droplets at 150 C., 300 C. and 550 C. Increasing the heating temperature results in a loss of the porosity. Thus particles obtained by heating at 150 C. are porous, whereas the particles obtained by heating at 300 C. and 550 C. are not porous.

[1729] The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with CdSe, CdS, CdTe, CdSe/CdS, CdSe/ZnS, CdSe/CdZnS, CdS/ZnS, CdS/CdZnS, CdTe/ZnS, CdTe/CdZnS, CdSeS/ZnS, CdSeS/CdS, CdSeS/CdZnS, CuInS.sub.2/ZnS, CuInSe.sub.2/ZnS, InP/CdS, InP/ZnS, InZnP/ZnS, InP/ZnSeS, InP/ZnSe, InP/CdZnS, CdSe/CdZnS/ZnS, CdSe/ZnS/CdZnS, CdSe/CdS/ZnS, CdSe/CdS/CdZnS, CdSe/ZnS e/ZnS, CdSeS/CdS/ZnS, CdSeS/CdS/CdZnS, CdSeS/CdZnS/ZnS, CdSeS/ZnSe/ZnS, CdSeS/ZnSe/CdZnS, CdSeS/ZnS/CdZnS, CdSe/ZnS/CdS, CdSeS/ZnS/CdS, CdS e/ZnSe/CdZnS, InP/ZnS e/ZnS, InP/CdS/ZnSe/ZnS, InP/CdS/ZnS, InP/ZnS/CdS, InP/GaP/ZnS, InP/GaP/ZnSe, InP/CdZnS/ZnS, InP/ZnS/CdZnS, InP/CdS/CdZnS, InP/ZnSe/CdZnS, InP/ZnS/ZnSe, InP/GaP/ZnSe/ZnS, InP/ZnS/ZnSe/ZnS, nanoplatelets or quantum dots, or a mixture thereof.

[1730] The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with organic nanoparticles, inorganic nanoparticles such as metal nanoparticles, halide nanoparticles, chalcogenide nanoparticles, phosphide nanoparticles, sulfide nanoparticles, metalloid nanoparticles, metallic alloy nanoparticles, phosphor nanoparticles, perovskite nanoparticles, ceramic nanoparticles such as for example oxide nanoparticles, carbide nanoparticles, nitride nanoparticles, or a mixture thereof.

[1731] The same procedure was carried out by replacing Al.sub.2O.sub.3 with ZnTe, SiO.sub.2, TiO.sub.2, HfO.sub.2, ZnSe, ZnO, ZnS or MgO, or a mixture thereof. Reaction temperature of the above procedure is adapted according to the inorganic material chosen.

[1732] The same procedure was carried out by replacing Al.sub.2O.sub.3 with a metal material, halide material, chalcogenide material, phosphide material, sulfide material, metalloid material, metallic alloy material, ceramic material such as for example oxide, carbide, nitride, glass, enamel, ceramic, stone, precious stone, pigment, cement and/or inorganic polymer, or a mixture thereof. Reaction temperature of the above procedure is adapted according to the inorganic material chosen.

Example 8: Composite Particles Preparation from an Organic Solution and an Aqueous SolutionInP/ZnS @Al.SUB.2.O.SUB.3

[1733] 4 mL of InP/ZnS nanoparticles suspended in heptane were mixed with aluminium tri-sec butoxide and 400 mL of heptane, then loaded in a spray-drying set-up. On another side, an acidic aqueous solution was prepared and loaded in the same spray-drying set-up, but at a different location than the first hexane solution. The two liquids were sprayed simultaneously with two different means for forming droplets towards a tube furnace heated at a temperature ranging from the boiling point of the solvent to 1000 C. with a nitrogen flow. The composite particles were collected at the surface of a filter.

[1734] The same procedure was carried out by replacing InP/ZnS nanoparticles with CdSe, CdS, CdTe, CdSe/CdS, CdSe/ZnS, CdSe/CdZnS, CdS/ZnS, CdS/CdZnS, CdTe/ZnS, CdTe/CdZnS, CdSe/CdZnS, CdSeS/ZnS, CdSeS/CdS, CdSeS/CdZnS, CuInS.sub.2/ZnS, CuInSe.sub.2/ZnS, InP/CdS, InP/ZnS, InZnP/ZnS, InP/ZnSeS, InP/ZnSe, InP/CdZnS, CdSe/CdZnS/ZnS, CdSe/ZnS/CdZnS, CdSe/CdS/ZnS, CdSe/CdS/CdZnS, CdSe/ZnSe/ZnS, CdSeS/CdS/ZnS, CdSeS/CdS/CdZnS, CdSeS/CdZnS/ZnS, CdSeS/ZnSe/ZnS, CdSeS/ZnSe/CdZnS, CdSeS/ZnS/CdZnS, CdS e/ZnS/CdS, CdSeS/ZnS/CdS, CdS e/ZnSe/CdZnS, InP/ZnSe/ZnS, InP/CdS/ZnS e/ZnS, InP/CdS/ZnS, InP/ZnS/CdS, InP/GaP/ZnS, InP/GaP/ZnSe, InP/CdZnS/ZnS, InP/ZnS/CdZnS, InP/CdS/CdZnS, InP/ZnSe/CdZnS, InP/ZnS/ZnSe, InP/GaP/ZnSe/ZnS, InP/ZnS/ZnSe/ZnS, nanoplatelets or quantum dots, or a mixture thereof.

[1735] The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with organic nanoparticles, inorganic nanoparticles such as metal nanoparticles, halide nanoparticles, chalcogenide nanoparticles, phosphide nanoparticles, sulfide nanoparticles, metalloid nanoparticles, metallic alloy nanoparticles, phosphor nanoparticles, perovskite nanoparticles, ceramic nanoparticles such as for example oxide nanoparticles, carbide nanoparticles, nitride nanoparticles, or a mixture thereof.

[1736] The same procedure was carried out by replacing Al.sub.2O.sub.3 with SiO.sub.2, TiO.sub.2, HfO.sub.2, ZnTe, ZnSe, ZnO, ZnS or MgO, or a mixture thereof. Reaction temperature of the above procedure is adapted according to the inorganic material chosen.

[1737] The same procedure was carried out by replacing Al.sub.2O.sub.3 with a metal material, halide material, chalcogenide material, phosphide material, sulfide material, metalloid material, metallic alloy material, ceramic material such as for example oxide, carbide, nitride, glass, enamel, ceramic, stone, precious stone, pigment, cement and/or inorganic polymer, or a mixture thereof. Reaction temperature of the above procedure is adapted according to the inorganic material chosen.

Example 9: Composite Particles Preparation from an Organic Solution and an Aqueous SolutionCH.SUB.5.N.SUB.2.PbBr.SUB.3.@Al.SUB.2.O.SUB.3

[1738] 100 L of CH.sub.5N.sub.2PbBr.sub.3 nanoparticles suspended in hexane were mixed with aluminium tri-sec butoxide and 5 mL of hexane, then loaded in a spray-drying set-up. On another side, an acidic aqueous solution was prepared and loaded in the same spray-drying set-up, but at a different location than the first hexane solution. The two liquids were sprayed simultaneously with two different means for forming droplets towards a tube furnace heated at a temperature ranging from the boiling point of the solvent to 1000 C. with a nitrogen flow. The composite particles were collected at the surface of a filter.

[1739] The same procedure was carried out by replacing Al.sub.2O.sub.3 with SiO.sub.2, TiO.sub.2, HfO.sub.2, ZnTe, ZnSe, ZnO, ZnS or MgO, or a mixture thereof. Reaction temperature of the above procedure is adapted according to the inorganic material chosen.

[1740] The same procedure was carried out by replacing Al.sub.2O.sub.3 with a metal material, halide material, chalcogenide material, phosphide material, sulfide material, metalloid material, metallic alloy material, ceramic material such as for example oxide, carbide, nitride, glass, enamel, ceramic, stone, precious stone, pigment, cement and/or inorganic polymer, or a mixture thereof. Reaction temperature of the above procedure is adapted according to the inorganic material chosen.

Example 10: Composite Particles Preparation from an Organic Solution and an Aqueous SolutionCdSe/CdZnSAu@SiO.SUB.2

[1741] On one side, 100 L of gold nanoparticles and 100 L of CdSe/CdZnS nanoplatelets suspended in an acidic aqueous solution were mixed with an acidic aqueous solution of TEOS at 0.13M previously hydrolyzed for 24 hours, then loaded in a spray-drying set-up. The suspension was sprayed towards a tube furnace heated at a temperature ranging from the boiling point of the solvent to 1000 C. with a nitrogen flow. The composite particles were collected at the surface of a GaN substrate. The GaN substrate with the deposited composite particles was then cut into pieces of 1 mm1 mm and electrically connected to get a LED emitting a mixture of the blue light and the light emitted by the fluorescent nanoparticles.

[1742] The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with CdSe, CdS, CdTe, CdSe/CdS, CdSe/ZnS, CdSe/CdZnS, CdS/ZnS, CdS/CdZnS, CdTe/ZnS, CdTe/CdZnS, CdSeS/ZnS, CdSeS/CdS, CdSeS/CdZnS, CuInS.sub.2/ZnS, CuInSe.sub.2/ZnS, InP/CdS, InP/ZnS, InZnP/ZnS, InP/ZnSeS, InP/ZnSe, InP/CdZnS, CdSe/CdZnS/ZnS, CdSe/ZnS/CdZnS, CdSe/CdS/ZnS, CdSe/CdS/CdZnS, CdSe/ZnS e/ZnS, CdSeS/CdS/ZnS, CdSeS/CdS/CdZnS, CdSeS/CdZnS/ZnS, CdSeS/ZnSe/ZnS, CdSeS/ZnSe/CdZnS, CdSeS/ZnS/CdZnS, CdSe/ZnS/CdS, CdSeS/ZnS/CdS, CdS e/ZnSe/CdZnS, InP/ZnS e/ZnS, InP/CdS/ZnSe/ZnS, InP/CdS/ZnS, InP/ZnS/CdS, InP/GaP/ZnS, InP/GaP/ZnSe, InP/CdZnS/ZnS, InP/ZnS/CdZnS, InP/CdS/CdZnS, InP/ZnSe/CdZnS, InP/ZnS/ZnSe, InP/GaP/ZnSe/ZnS, InP/ZnS/ZnSe/ZnS, nanoplatelets or quantum dots, or a mixture thereof.

[1743] The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with organic nanoparticles, inorganic nanoparticles such as metal nanoparticles, halide nanoparticles, chalcogenide nanoparticles, phosphide nanoparticles, sulfide nanoparticles, metalloid nanoparticles, metallic alloy nanoparticles, phosphor nanoparticles, perovskite nanoparticles, ceramic nanoparticles such as for example oxide nanoparticles, carbide nanoparticles, nitride nanoparticles, or a mixture thereof.

[1744] The same procedure was carried out by replacing SiO.sub.2 with Al.sub.2O.sub.3, TiO.sub.2, HfO.sub.2, ZnTe, ZnSe, ZnO, ZnS or MgO, or a mixture thereof. Reaction temperature of the above procedure is adapted according to the inorganic material chosen.

[1745] The same procedure was carried out by replacing SiO.sub.2 with a metal material, halide material, chalcogenide material, phosphide material, sulfide material, metalloid material, metallic alloy material, ceramic material such as for example oxide, carbide, nitride, glass, enamel, ceramic, stone, precious stone, pigment, cement and/or inorganic polymer, or a mixture thereof. Reaction temperature of the above procedure is adapted according to the inorganic material chosen.

Example 11: Composite Particles Preparation from an Organic Solution and an Aqueous SolutionFe.SUB.3.O.SUB.4.@Al.SUB.2.O.SUB.3.CdSe/CdZnS @SiO.SUB.2

[1746] On one side, 100 L of Fe.sub.3O.sub.4 nanoparticles suspended in an acidic aqueous solution were mixed with an acidic aqueous solution of TEOS at 0.13M previously hydrolyzed for 24 hours. On another side, 100 L of CdSe/CdZnS nanoplatelets suspended in heptane were mixed with aluminium tri-sec butoxide and 5 mL of heptane, then loaded on the same spray-drying set-up, but at a different location than the first aqueous solution. The two liquids were sprayed simultaneously with two different means for forming droplets towards a tube furnace heated at a temperature ranging from the boiling point of the solvent to 1000 C. with a nitrogen flow. The composite particles were collected at the surface of a filter. The composite particles comprise a core of silica containing Fe.sub.3O.sub.4 nanoparticles and a shell of alumina containing CdSe/CdZnS nanoplatelets.

[1747] The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with CdSe, CdS, CdTe, CdSe/CdS, CdSe/ZnS, CdSe/CdZnS, CdS/ZnS, CdS/CdZnS, CdTe/ZnS, CdTe/CdZnS, CdSeS/ZnS, CdSeS/CdS, CdSeS/CdZnS, CuInS.sub.2/ZnS, CuInSe.sub.2/ZnS, InP/CdS, InP/ZnS, InZnP/ZnS, InP/ZnSeS, InP/ZnSe, InP/CdZnS, CdSe/CdZnS/ZnS, CdSe/ZnS/CdZnS, CdSe/CdS/ZnS, CdSe/CdS/CdZnS, CdSe/ZnS e/ZnS, CdSeS/CdS/ZnS, CdSeS/CdS/CdZnS, CdSeS/CdZnS/ZnS, CdSeS/ZnSe/ZnS, CdSeS/ZnSe/CdZnS, CdSeS/ZnS/CdZnS, CdSe/ZnS/CdS, CdSeS/ZnS/CdS, CdS e/ZnSe/CdZnS, InP/ZnS e/ZnS, InP/CdS/ZnSe/ZnS, InP/CdS/ZnS, InP/ZnS/CdS, InP/GaP/ZnS, InP/GaP/ZnSe, InP/CdZnS/ZnS, InP/ZnS/CdZnS, InP/CdS/CdZnS, InP/ZnSe/CdZnS, InP/ZnS/ZnSe, InP/GaP/ZnSe/ZnS, InP/ZnS/ZnSe/ZnS, nanoplatelets or quantum dots, or a mixture thereof.

[1748] The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with organic nanoparticles, inorganic nanoparticles such as metal nanoparticles, halide nanoparticles, chalcogenide nanoparticles, phosphide nanoparticles, sulfide nanoparticles, metalloid nanoparticles, metallic alloy nanoparticles, phosphor nanoparticles, perovskite nanoparticles, ceramic nanoparticles such as for example oxide nanoparticles, carbide nanoparticles, nitride nanoparticles, or a mixture thereof.

[1749] The same procedure was carried out by replacing Al.sub.2O.sub.3 and/or SiO.sub.2 with TiO.sub.2, SiO.sub.2, Al.sub.2O.sub.3, HfO.sub.2, ZnTe, ZnSe, ZnO, ZnS or MgO, or a mixture thereof. Reaction temperature of the above procedure is adapted according to the inorganic material chosen.

[1750] The same procedure was carried out by replacing Al.sub.2O.sub.3 and/or SiO.sub.2 with a metal material, halide material, chalcogenide material, phosphide material, sulfide material, metalloid material, metallic alloy material, ceramic material such as for example oxide, carbide, nitride, glass, enamel, ceramic, stone, precious stone, pigment, cement and/or inorganic polymer, or a mixture thereof. Reaction temperature of the above procedure is adapted according to the inorganic material chosen.

Example 12: Composite Particles Preparation from an Organic Solution and an Aqueous SolutionCdS/ZnS Nanoplatelets@Al.SUB.2.O.SUB.3

[1751] 4 mL of CdS/ZnS nanoplatelets suspended in heptane were mixed with aluminium tri-sec butoxide and 400 mL of heptane, then loaded in a spray-drying set-up. On another side, an acidic aqueous solution was prepared and loaded in the same spray-drying set-up, but at a different location than the first hexane solution. The two liquids were sprayed simultaneously with two different means for forming droplets towards a tube furnace heated at a temperature ranging from the boiling point of the solvent to 1000 C. with a nitrogen flow. The composite particles were collected at the surface of a filter.

[1752] The same procedure was carried out by replacing CdS/ZnS nanoplatelets with CdSe, CdS, CdTe, CdS e/CdS, CdS e/ZnS, CdSe/CdZnS, CdS/CdZnS, CdTe/ZnS, CdSe/CdZnS, CdTe/CdZnS, CdSeS/ZnS, CdSeS/CdS, CdSeS/CdZnS, CuInS.sub.2/ZnS, CuInSe.sub.2/ZnS, InP/CdS, InP/ZnS, InZnP/ZnS, InP/ZnSeS, InP/ZnSe, InP/CdZnS, CdSe/CdZnS/ZnS, CdSe/ZnS/CdZnS, CdSe/CdS/ZnS, CdSe/CdS/CdZnS, CdSe/ZnSe/ZnS, CdSeS/CdS/ZnS, CdSeS/CdS/CdZnS, CdSeS/CdZnS/ZnS, CdSeS/ZnSe/ZnS, CdSeS/ZnSe/CdZnS, CdSeS/ZnS/CdZnS, CdS e/ZnS/CdS, CdSeS/ZnS/CdS, CdS e/ZnSe/CdZnS, InP/ZnSe/ZnS, InP/CdS/ZnS e/ZnS, InP/CdS/ZnS, InP/ZnS/CdS, InP/GaP/ZnS, InP/GaP/ZnSe, InP/CdZnS/ZnS, InP/ZnS/CdZnS, InP/CdS/CdZnS, InP/ZnSe/CdZnS, InP/ZnS/ZnSe, InP/GaP/ZnSe/ZnS, InP/ZnS/ZnSe/ZnS, nanoplatelets or quantum dots, or a mixture thereof.

[1753] The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with organic nanoparticles, inorganic nanoparticles such as metal nanoparticles, halide nanoparticles, chalcogenide nanoparticles, phosphide nanoparticles, sulfide nanoparticles, metalloid nanoparticles, metallic alloy nanoparticles, phosphor nanoparticles, perovskite nanoparticles, ceramic nanoparticles such as for example oxide nanoparticles, carbide nanoparticles, nitride nanoparticles, or a mixture thereof.

[1754] The same procedure was carried out by replacing Al.sub.2O.sub.3 with SiO.sub.2, TiO.sub.2, HfO.sub.2, ZnTe, ZnSe, ZnO, ZnS or MgO, or a mixture thereof. Reaction temperature of the above procedure is adapted according to the inorganic material chosen.

[1755] The same procedure was carried out by replacing Al.sub.2O.sub.3 with a metal material, halide material, chalcogenide material, phosphide material, sulfide material, metalloid material, metallic alloy material, ceramic material such as for example oxide, carbide, nitride, glass, enamel, ceramic, stone, precious stone, pigment, cement and/or inorganic polymer, or a mixture thereof. Reaction temperature of the above procedure is adapted according to the inorganic material chosen.

Example 13: Composite Particles Preparation from an Organic Solution and an Aqueous SolutionInP/ZnS@SiO.SUB.2

[1756] 4 mL of InP/ZnS nanoparticles suspended in an acidic aqueous solution were mixed with an acidic aqueous solution of TEOS at 0.13M previously hydrolyzed for 24 hours, then loaded in a spray-drying set-up. The suspension was sprayed for forming droplets towards a tube furnace heated a temperature ranging from the boiling point of the solvent to 1000 C. with a nitrogen flow. The composite particles were collected at the surface of a filter.

[1757] The same procedure was carried out by replacing InP/ZnS nanoparticles with CdSe, CdS, CdTe, CdSe/CdS, CdSe/ZnS, CdSe/CdZnS, CdS/ZnS, CdS/CdZnS, CdTe/ZnS, CdTe/CdZnS, CdSeS/ZnS, CdSeS/CdS, CdSeS/CdZnS, CuInS.sub.2/ZnS, CuInSe.sub.2/ZnS, CdS e/CdZnS, InP/CdS, InZnP/ZnS, InP/ZnSeS, InP/ZnSe, InP/CdZnS, CdSe/CdZnS/ZnS, CdSe/ZnS/CdZnS, CdSe/CdS/ZnS, CdSe/CdS/CdZnS, CdSe/ZnS e/ZnS, CdSeS/CdS/ZnS, CdSeS/CdS/CdZnS, CdSeS/CdZnS/ZnS, CdSeS/ZnSe/ZnS, CdSeS/ZnSe/CdZnS, CdSeS/ZnS/CdZnS, CdSe/ZnS/CdS, CdSeS/ZnS/CdS, CdS e/ZnSe/CdZnS, InP/ZnS e/ZnS, InP/CdS/ZnSe/ZnS, InP/CdS/ZnS, InP/ZnS/CdS, InP/GaP/ZnS, InP/GaP/ZnSe, InP/CdZnS/ZnS, InP/ZnS/CdZnS, InP/CdS/CdZnS, InP/ZnSe/CdZnS, InP/ZnS/ZnSe, InP/GaP/ZnSe/ZnS, InP/ZnS/ZnSe/ZnS, nanoplatelets or quantum dots, or a mixture thereof.

[1758] The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with organic nanoparticles, inorganic nanoparticles such as metal nanoparticles, halide nanoparticles, chalcogenide nanoparticles, phosphide nanoparticles, sulfide nanoparticles, metalloid nanoparticles, metallic alloy nanoparticles, phosphor nanoparticles, perovskite nanoparticles, ceramic nanoparticles such as for example oxide nanoparticles, carbide nanoparticles, nitride nanoparticles, or a mixture thereof.

[1759] The same procedure was carried out by replacing SiO.sub.2 with Al.sub.2O.sub.3, TiO.sub.2, HfO.sub.2, ZnTe, ZnSe, ZnO, ZnS or MgO, or a mixture thereof. Reaction temperature of the above procedure is adapted according to the inorganic material chosen.

[1760] The same procedure was carried out by replacing SiO.sub.2 with a metal material, halide material, chalcogenide material, phosphide material, sulfide material, metalloid material, metallic alloy material, ceramic material such as for example oxide, carbide, nitride, glass, enamel, ceramic, stone, precious stone, pigment, cement and/or inorganic polymer, or a mixture thereof. Reaction temperature of the above procedure is adapted according to the inorganic material chosen.

Example 14: Particles Preparation from an Organic Solution and an Aqueous Solution, Followed by a Treatment of Ammonia VaporsCdSe/CdZnS @ZnO

[1761] 100 L of CdSe/CdZnS nanoplatelets suspended in heptane were mixed with zinc methoxyethoxide and 5 mL of pentane, then loaded on a spray-drying set-up as described in the invention. On another side, a basic aqueous solution was prepared and loaded on the same spray-drying set-up, but at a different location than the first heptane solution. On another side, an ammonium hydroxide solution was loaded on the same spray-drying system, between the tube furnace and the filter. The two first liquids were sprayed while the third one was heated at 35 C. by an external heating system to produce ammonia vapors, simultaneously towards a tube furnace heated at a temperature ranging from the boiling point of the solvent to 1000 C. with a nitrogen flow. The particles were collected at the surface of a filter.

[1762] The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with CdSe, CdS, CdTe, CdSe/CdS, CdSe/ZnS, CdSe/CdZnS, CdS/ZnS, CdS/CdZnS, CdTe/ZnS, CdTe/CdZnS, CdSeS/ZnS, CdSeS/CdS, CdSeS/CdZnS, CuInS.sub.2/ZnS, CuInSe.sub.2/ZnS, InP/CdS, InP/ZnS, InZnP/ZnS, InP/ZnSeS, InP/ZnSe, InP/CdZnS, CdSe/CdZnS/ZnS, CdSe/ZnS/CdZnS, CdSe/CdS/ZnS, CdSe/CdS/CdZnS, CdSe/ZnS e/ZnS, CdSeS/CdS/ZnS, CdSeS/CdS/CdZnS, CdSeS/CdZnS/ZnS, CdSeS/ZnSe/ZnS, CdSeS/ZnSe/CdZnS, CdSeS/ZnS/CdZnS, CdSe/ZnS/CdS, CdSeS/ZnS/CdS, CdS e/ZnSe/CdZnS, InP/ZnS e/ZnS, InP/CdS/ZnSe/ZnS, InP/CdS/ZnS, InP/ZnS/CdS, InP/GaP/ZnS, InP/GaP/ZnSe, InP/CdZnS/ZnS, InP/ZnS/CdZnS, InP/CdS/CdZnS, InP/ZnSe/CdZnS, InP/ZnS/ZnSe, InP/GaP/ZnSe/ZnS, InP/ZnS/ZnSe/ZnS, nanoplatelets or quantum dots, or a mixture thereof.

[1763] The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with organic nanoparticles, inorganic nanoparticles such as metal nanoparticles, halide nanoparticles, chalcogenide nanoparticles, phosphide nanoparticles, sulfide nanoparticles, metalloid nanoparticles, metallic alloy nanoparticles, phosphor nanoparticles, perovskite nanoparticles, ceramic nanoparticles such as for example oxide nanoparticles, carbide nanoparticles, nitride nanoparticles, or a mixture thereof.

[1764] The same procedure was carried out by replacing ZnO with SiO.sub.2, TiO.sub.2, HfO.sub.2, Al.sub.2O.sub.3, ZnTe, ZnSe, ZnS or MgO, or a mixture thereof. Reaction temperature of the above procedure is adapted according to the inorganic material chosen.

[1765] The same procedure was carried out by replacing ZnO with a metal material, halide material, chalcogenide material, phosphide material, sulfide material, metalloid material, metallic alloy material, ceramic material such as for example oxide, carbide, nitride, glass, enamel, ceramic, stone, precious stone, pigment, cement and/or inorganic polymer, or a mixture thereof. Reaction temperature of the above procedure is adapted according to the inorganic material chosen.

Example 15: Particles Preparation from an Organic Solution and an Aqueous Solution, Followed by an Extra Shell CoatingCdSe/CdZnS@Al.SUB.2.O.SUB.3.@MgO

[1766] 100 L of CdSe/CdZnS nanoplatelets suspended in heptane were mixed with zinc methoxyethoxide and 5 mL of pentane, then loaded on a spray-drying set-up as described in the invention. On another side, a basic aqueous solution was prepared and loaded on the same spray-drying set-up, but at a different location than the first heptane solution. The two liquids were sprayed simultaneously towards a tube furnace heated at a temperature ranging from the boiling point of the solvent to 1000 C. with a nitrogen flow. The particles were directed towards a tube where an extra MgO shell was coated at the surface of the particles by an ALD process, said particles being suspended in the gas. The particles were finally collected on the inner wall of the tube where the ALD was performed.

[1767] The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with CdSe, CdS, CdTe, CdSe/CdS, CdSe/ZnS, CdSe/CdZnS, CdS/ZnS, CdS/CdZnS, CdTe/ZnS, CdTe/CdZnS, CdSeS/ZnS, CdSeS/CdS, CdSeS/CdZnS, CuInS.sub.2/ZnS, CuInSe.sub.2/ZnS, InP/CdS, InP/ZnS, InZnP/ZnS, InP/ZnSeS, InP/ZnSe, InP/CdZnS, CdSe/CdZnS/ZnS, CdSe/ZnS/CdZnS, CdSe/CdS/ZnS, CdSe/CdS/CdZnS, CdSe/ZnS e/ZnS, CdSeS/CdS/ZnS, CdSeS/CdS/CdZnS, CdSeS/CdZnS/ZnS, CdSeS/ZnSe/ZnS, CdSeS/ZnSe/CdZnS, CdSeS/ZnS/CdZnS, CdSe/ZnS/CdS, CdSeS/ZnS/CdS, CdS e/ZnSe/CdZnS, InP/ZnS e/ZnS, InP/CdS/ZnSe/ZnS, InP/CdS/ZnS, InP/ZnS/CdS, InP/GaP/ZnS, InP/GaP/ZnSe, InP/CdZnS/ZnS, InP/ZnS/CdZnS, InP/CdS/CdZnS, InP/ZnSe/CdZnS, InP/ZnS/ZnSe, InP/GaP/ZnSe/ZnS, InP/ZnS/ZnSe/ZnS, nanoplatelets or quantum dots, or a mixture thereof.

[1768] The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with organic nanoparticles, inorganic nanoparticles such as metal nanoparticles, halide nanoparticles, chalcogenide nanoparticles, phosphide nanoparticles, sulfide nanoparticles, metalloid nanoparticles, metallic alloy nanoparticles, phosphor nanoparticles, perovskite nanoparticles, ceramic nanoparticles such as for example oxide nanoparticles, carbide nanoparticles, nitride nanoparticles, or a mixture thereof.

Example 16: Particles Preparation from an Organic Solution and an Aqueous SolutionCdSe/CdZnSFe.SUB.3.O.SUB.4.@SiO.SUB.2

[1769] On one side, 100 L of Fe.sub.3O.sub.4 nanoparticles and 100 L of CdSe/CdZnS nanoplatelets suspended in an acidic aqueous solution were mixed with an acidic aqueous solution of TEOS at 0.13M previously hydrolyzed for 24 hours, then loaded in a spray-drying set-up as described in the invention. On another side, an acidic aqueous solution was prepared and loaded on the same spray-drying set-up, but at a different location than the first heptane solution. The two liquids were sprayed simultaneously towards a tube furnace heated at a temperature ranging from the boiling point of the solvent to 1000 C. with a nitrogen flow. The particles were collected at the surface of a filter.

[1770] The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with CdSe, CdS, CdTe, CdSe/CdS, CdSe/ZnS, CdSe/CdZnS, CdS/ZnS, CdS/CdZnS, CdTe/ZnS, CdTe/CdZnS, CdSeS/ZnS, CdSeS/CdS, CdSeS/CdZnS, CuInS.sub.2/ZnS, CuInSe.sub.2/ZnS, InP/CdS, InP/ZnS, InZnP/ZnS, InP/ZnSeS, InP/ZnSe, InP/CdZnS, CdSe/CdZnS/ZnS, CdSe/ZnS/CdZnS, CdSe/CdS/ZnS, CdSe/CdS/CdZnS, CdSe/ZnS e/ZnS, CdSeS/CdS/ZnS, CdSeS/CdS/CdZnS, CdSeS/CdZnS/ZnS, CdSeS/ZnSe/ZnS, CdSeS/ZnSe/CdZnS, CdSeS/ZnS/CdZnS, CdSe/ZnS/CdS, CdSeS/ZnS/CdS, CdS e/ZnSe/CdZnS, InP/ZnS e/ZnS, InP/CdS/ZnSe/ZnS, InP/CdS/ZnS, InP/ZnS/CdS, InP/GaP/ZnS, InP/GaP/ZnSe, InP/CdZnS/ZnS, InP/ZnS/CdZnS, InP/CdS/CdZnS, InP/ZnSe/CdZnS, InP/ZnS/ZnSe, InP/GaP/ZnSe/ZnS, InP/ZnS/ZnSe/ZnS, nanoplatelets or quantum dots, or a mixture thereof.

[1771] The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with organic nanoparticles, inorganic nanoparticles such as metal nanoparticles, halide nanoparticles, chalcogenide nanoparticles, phosphide nanoparticles, sulfide nanoparticles, metalloid nanoparticles, metallic alloy nanoparticles, phosphor nanoparticles, perovskite nanoparticles, ceramic nanoparticles such as for example oxide nanoparticles, carbide nanoparticles, nitride nanoparticles, or a mixture thereof.

Example 17: Core/Shell Particles Preparation from an Organic Solution and an Aqueous SolutionAu@Al.SUB.2.O.SUB.3 .in the Core and CdSe/CdZnS@SiO.SUB.2 .in the Shell

[1772] On one side, 100 L of CdSe/CdZnS nanoplatelets suspended in an acidic aqueous solution were mixed with an acidic aqueous solution of TEOS at 0.13M previously hydrolyzed for 24 hours, then loaded on a spray-drying set-up as described in the invention. On another side, 100 L of Au nanoparticles suspended in heptane were mixed with aluminium tri-sec butoxide and 5 mL of heptane, then loaded on the same spray-drying set-up, but at a different location than the first aqueous solution. The two liquids were sprayed simultaneously towards a tube furnace heated at a temperature ranging from the boiling point of the solvent to 1000 C. with a nitrogen flow. The particles were collected at the surface of a filter. The particles comprise a core of alumina containing gold nanoparticles and a shell of silica containing CdSe/CdZnS nanoplatelets.

[1773] The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with CdSe, CdS, CdTe, CdSe/CdS, CdSe/ZnS, CdSe/CdZnS, CdS/ZnS, CdS/CdZnS, CdTe/ZnS, CdTe/CdZnS, CdSeS/ZnS, CdSeS/CdS, CdSeS/CdZnS, CuInS.sub.2/ZnS, CuInSe.sub.2/ZnS, InP/CdS, InP/ZnS, InZnP/ZnS, InP/ZnSeS, InP/ZnSe, InP/CdZnS, CdSe/CdZnS/ZnS, CdSe/ZnS/CdZnS, CdSe/CdS/ZnS, CdSe/CdS/CdZnS, CdSe/ZnS e/ZnS, CdSeS/CdS/ZnS, CdSeS/CdS/CdZnS, CdSeS/CdZnS/ZnS, CdSeS/ZnSe/ZnS, CdSeS/ZnSe/CdZnS, CdSeS/ZnS/CdZnS, CdSe/ZnS/CdS, CdSeS/ZnS/CdS, CdS e/ZnSe/CdZnS, InP/ZnS e/ZnS, InP/CdS/ZnSe/ZnS, InP/CdS/ZnS, InP/ZnS/CdS, InP/GaP/ZnS, InP/GaP/ZnSe, InP/CdZnS/ZnS, InP/ZnS/CdZnS, InP/CdS/CdZnS, InP/ZnSe/CdZnS, InP/ZnS/ZnSe, InP/GaP/ZnSe/ZnS, InP/ZnS/ZnSe/ZnS, nanoplatelets or quantum dots, or a mixture thereof.

[1774] The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with organic nanoparticles, inorganic nanoparticles such as metal nanoparticles, halide nanoparticles, chalcogenide nanoparticles, phosphide nanoparticles, sulfide nanoparticles, metalloid nanoparticles, metallic alloy nanoparticles, phosphor nanoparticles, perovskite nanoparticles, ceramic nanoparticles such as for example oxide nanoparticles, carbide nanoparticles, nitride nanoparticles, or a mixture thereof.

Example 18: Composite Particles PreparationPhosphor Nanoparticles @SiO.SUB.2

[1775] Phosphor nanoparticles were suspended in a basic aqueous solution were mixed with a basic aqueous solution of TEOS at 0.13M previously hydrolyzed for 24 hours, then loaded on a spray-drying set-up. The liquid mixture was sprayed towards a tube furnace heated at a temperature ranging from the boiling point of the solvent to 1000 C. with a nitrogen flow. The composite particles were collected at the surface of a filter.

[1776] Phosphor nanoparticles used for this example were: Yttrium aluminium garnet nanoparticles (YAG, Y.sub.3Al.sub.5O.sub.12), (Ca,Y)--SiAlON:Eu nanoparticles, ((Y,Gd).sub.3(Al,Ga).sub.5O.sub.12:Ce) nanoparticles, CaAlSiN.sub.3:Eu nanoparticles, sulfide-based phosphor nanoparticles, PFS:Mn.sup.4+ nanoparticles (potassium fluorosilicate).

Example 19: Composite Particles PreparationPhosphor Nanoparticles@Al.SUB.2.O.SUB.3

[1777] Phosphor nanoparticles were suspended in heptane were mixed with aluminium tri-sec butoxide and 400 mL of heptane, then loaded in a spray-drying set-up. On another side, an acidic aqueous solution was prepared and loaded in the same spray-drying set-up, but at a different location than the first hexane solution. The two liquids were sprayed simultaneously with two different means for forming droplets towards a tube furnace heated at a temperature ranging from the boiling point of the solvent to 1000 C. with a nitrogen flow. The composite particles were collected at the surface of a filter.

[1778] Phosphor nanoparticles used for this example were: Yttrium aluminium garnet nanoparticles (YAG, Y.sub.3Al.sub.5O.sub.12), (Ca,Y)--SiAlON:Eu nanoparticles, ((Y,Gd).sub.3(Al,Ga).sub.5O.sub.12:Ce) nanoparticles, CaAlSiN.sub.3:Eu nanoparticles, sulfide-based phosphor nanoparticles, PFS:Mn.sup.4+ nanoparticles (potassium fluorosilicate).

Example 20: Composite Particles PreparationCdSe/CdZnS @HfO.SUB.2

[1779] 100 L of CdSe/CdZnS nanoplatelets suspended in heptane (10 mg/mL) were mixed with Hafnium n-butoxide and 5 mL of pentane, then loaded on a spray-drying set-up. On another side, a basic aqueous solution was prepared and loaded on the same spray-drying set-up, but at a different location than the first heptane solution. The two liquids were sprayed simultaneously towards a tube furnace heated at a temperature ranging from the boiling point of the solvent to 1000 C. with a nitrogen flow. Composite particles were collected at the surface of a filter.

[1780] The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with CdSe, CdS, CdTe, CdSe/CdS, CdSe/ZnS, CdSe/CdZnS, CdS/ZnS, CdS/CdZnS, CdTe/ZnS, CdTe/CdZnS, CdSeS/ZnS, CdSeS/CdS, CdSeS/CdZnS, CuInS.sub.2/ZnS, CuInSe.sub.2/ZnS, InP/CdS, InP/ZnS, InZnP/ZnS, InP/ZnSeS, InP/ZnSe, InP/CdZnS, CdSe/CdZnS/ZnS, CdSe/ZnS/CdZnS, CdSe/CdS/ZnS, CdSe/CdS/CdZnS, CdSe/ZnS e/ZnS, CdSeS/CdS/ZnS, CdSeS/CdS/CdZnS, CdSeS/CdZnS/ZnS, CdSeS/ZnSe/ZnS, CdSeS/ZnSe/CdZnS, CdSeS/ZnS/CdZnS, CdSe/ZnS/CdS, CdSeS/ZnS/CdS, CdS e/ZnSe/CdZnS, InP/ZnS e/ZnS, InP/CdS/ZnSe/ZnS, InP/CdS/ZnS, InP/ZnS/CdS, InP/GaP/ZnS, InP/GaP/ZnSe, InP/CdZnS/ZnS, InP/ZnS/CdZnS, InP/CdS/CdZnS, InP/ZnSe/CdZnS, InP/ZnS/ZnSe, InP/GaP/ZnSe/ZnS, InP/ZnS/ZnSe/ZnS, nanoplatelets or quantum dots, or a mixture thereof.

[1781] The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with organic nanoparticles, inorganic nanoparticles such as metal nanoparticles, halide nanoparticles, chalcogenide nanoparticles, phosphide nanoparticles, sulfide nanoparticles, metalloid nanoparticles, metallic alloy nanoparticles, phosphor nanoparticles, perovskite nanoparticles, ceramic nanoparticles such as for example oxide nanoparticles, carbide nanoparticles, nitride nanoparticles, or a mixture thereof.

Example 21: Composite Particles PreparationPhosphor Nanoparticles @HfO.SUB.2

[1782] 1 m of phosphor nanoparticles (cf. list below) suspended in heptane (10 mg/mL) were mixed with hafnium n-butoxide and 5 mL of pentane, then loaded on a spray-drying set-up. On another side, an aqueous solution was prepared and loaded on the same spray-drying set-up, but at a different location than the first heptane solution. The two liquids were sprayed simultaneously towards a tube furnace heated at a temperature ranging from the boiling point of the solvent to 1000 C. with a nitrogen flow. The resulting particles phosphors particles @HfO.sub.2 were collected at the surface of a filter.

[1783] Phosphor nanoparticles used for this example were: Yttrium aluminium garnet nanoparticles (YAG, Y.sub.3Al.sub.5O.sub.12), (Ca,Y)--SiAlON:Eu nanoparticles, ((Y,Gd).sub.3(Al,Ga).sub.5O.sub.12:Ce) nanoparticles, CaAlSiN.sub.3:Eu nanoparticles, sulfide-based phosphor nanoparticles, PFS:Mn.sup.4+ nanoparticles (potassium fluorosilicate).

Example 22: Composite Particles Preparation from an Organometallic Precursor

[1784] 100 L of CdSe/CdZnS nanoplatelets suspended in heptane were mixed with an organometallic precursor selected in the group below in pentane under controlled atmosphere, then loaded on a spray-drying set-up. On another side, an aqueous solution was prepared and loaded on the same spray-drying set-up, but at a different location than the first heptane solution. The two liquids were sprayed simultaneously towards a tube furnace heated from room temperature to 300 C. with a nitrogen flow. The composite particles were collected at the surface of a filter.

[1785] The procedure was carried out with an organometallic precursor selected in the group comprising: Al[N(SiMe.sub.3).sub.2].sub.3, trimethyl aluminium, triisobutylaluminum, trioctylaluminum, triphenylaluminum, dimethyl aluminium, trimethyl zinc, dimethyl zinc, diethylzinc, Zn[(N(TMS).sub.2].sub.2, Zn[(CF.sub.3SO.sub.2).sub.2N].sub.2, Zn(Ph).sub.2, Zn(C.sub.6F.sub.5).sub.2, Zn(TMHD).sub.2 (-diketonate), Hf[C.sub.5H.sub.4(CH.sub.3)].sub.2(CH.sub.3).sub.2, HfCH.sub.3(OCH.sub.3)[C.sub.5H.sub.4(CH.sub.3)].sub.2, [[(CH.sub.3).sub.3Si].sub.2N].sub.2HfCl.sub.2, (C.sub.5H.sub.5).sub.2Hf(CH.sub.3).sub.2, [(CH.sub.2CH.sub.3).sub.2N].sub.4Hf, [(CH.sub.3).sub.2N].sub.4Hf, [(CH.sub.3).sub.2N].sub.4Hf, [(CH.sub.3)(C.sub.2H.sub.5)N].sub.4Hf, [(CH.sub.3)(C.sub.2H.sub.5)N].sub.4Hf, 2,2,6,6-tetramethyl-3,5-heptanedione zirconium (Zr(THD).sub.4), C.sub.10H.sub.12Zr, Zr(CH.sub.3C.sub.5H.sub.4).sub.2CH.sub.3OCH.sub.3, C.sub.22H.sub.36Zr, [(C.sub.2H.sub.5).sub.2N].sub.4Zr, [(CH.sub.3).sub.2N].sub.4Zr, [(CH.sub.3).sub.2N].sub.4Zr, Zr(NCH.sub.3C.sub.2H.sub.5).sub.4, Zr(NCH.sub.3C.sub.2H.sub.5).sub.4, C.sub.18H.sub.32O.sub.6Zr, Zr(C.sub.8H.sub.15O.sub.2).sub.4, Zr(OCC(CH.sub.3).sub.3CHCOC(CH.sub.3).sub.3).sub.4, Mg(C.sub.5H.sub.5).sub.2, or C.sub.20H.sub.30Mg. Reaction temperature of the above procedure is adapted according to the organometallic precursor chosen.

[1786] The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with CdSe, CdS, CdTe, CdSe/CdS, CdSe/ZnS, CdSe/CdZnS, CdS/ZnS, CdS/CdZnS, CdTe/ZnS, CdTe/CdZnS, CdSeS/ZnS, CdSeS/CdS, CdSeS/CdZnS CuInS.sub.2/ZnS, CuInSe.sub.2/ZnS InP/CdS, InP/ZnS, InZnP/ZnS, InP/ZnSeS, InP/ZnSe, InP/CdZnS, CdSe/CdZnS/ZnS, CdSe/ZnS/CdZnS, CdSe/CdS/ZnS, CdSe/CdS/CdZnS, CdSe/ZnS e/ZnS CdSeS/CdS/ZnS CdSeS/CdS/CdZnS, CdSeS/CdZnS/ZnS, CdSeS/ZnSe/ZnS CdSeS/ZnSe/CdZnS CdSeS/ZnS/CdZnS, CdSe/ZnS/CdS, CdSeS/ZnS/CdS, CdS e/ZnSe/CdZnS InP/ZnS e/ZnS InP/CdS/ZnSe/ZnS, InP/CdS/ZnS, InP/ZnS/CdS, InP/GaP/ZnS, InP/GaP/ZnSe, InP/CdZnS/ZnS, InP/ZnS/CdZnS, InP/CdS/CdZnS, InP/ZnSe/CdZnS, InP/ZnS/ZnSe, InP/GaP/ZnSe/ZnS, InP/ZnS/ZnSe/ZnS, nanoplatelets or quantum dots, or a mixture thereof.

[1787] The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with organic nanoparticles, inorganic nanoparticles such as metal nanoparticles, halide nanoparticles, chalcogenide nanoparticles, phosphide nanoparticles, sulfide nanoparticles, metalloid nanoparticles, metallic alloy nanoparticles, phosphor nanoparticles, perovskite nanoparticles, ceramic nanoparticles such as for example oxide nanoparticles, carbide nanoparticles, nitride nanoparticles, or a mixture thereof.

[1788] The same procedure was carried out by replacing Al.sub.2O.sub.3 with ZnO, TiO.sub.2, MgO, HfO.sub.2 or ZrO.sub.2, or a mixture thereof.

[1789] The same procedure was carried out by replacing Al.sub.2O.sub.3 with a metal material, halide material, chalcogenide material, phosphide material, sulfide material, metalloid material, metallic alloy material, ceramic material such as for example oxide, carbide, nitride, glass, enamel, ceramic, stone, precious stone, pigment, cement and/or inorganic polymer, or a mixture thereof.

[1790] The same procedure was carried out by replacing the aqueous solution with another liquid or vapor source of oxidation.

Example 23: Composite Particles Preparation from an Organometallic PrecursorCdSe/CdZnS@ZnTe

[1791] 100 L of CdSe/CdZnS nanoplatelets suspended in heptane were mixed with two organometallic precursors selected in the group below in pentane under inert atmosphere then loaded on a spray-drying set-up. The suspension was sprayed towards a tube furnace heated from RT to 300 C. with a nitrogen flow. The composite particles were collected at the surface of a filter.

[1792] The procedure was carried out by with a first organometallic precursor selected in the group comprising: dimethyl telluride, diethyl telluride, diisopropyl telluride, di-t-butyl telluride, diallyl telluride, methyl allyl telluride, dimethyl selenide, or dimethyl sulfur. Reaction temperature of the above procedure is adapted according to the organometallic precursor chosen.

[1793] The procedure was carried out by with a second organometallic precursor selected in the group comprising: dimethyl zinc, trimethyl zinc, diethylzinc, Zn[(N(TMS).sub.2].sub.2, Zn[(CF.sub.3SO.sub.2).sub.2N].sub.2, Zn(Ph).sub.2, Zn(C.sub.6F.sub.5).sub.2, or Zn(TMHD).sub.2 (-diketonate), or a mixture thereof. Reaction temperature of the above procedure is adapted according to the organometallic precursor chosen.

[1794] The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with CdSe, CdS, CdTe, CdSe/CdS, CdSe/ZnS, CdSe/CdZnS, CdS/ZnS, CdS/CdZnS, CdTe/ZnS, CdTe/CdZnS, CdSeS/ZnS, CdSeS/CdS, CdSeS/CdZnS, CuInS.sub.2/ZnS, CuInSe.sub.2/ZnS, InP/CdS, InP/ZnS, InZnP/ZnS, InP/ZnSeS, InP/ZnSe, InP/CdZnS, CdSe/CdZnS/ZnS, CdSe/ZnS/CdZnS, CdSe/CdS/ZnS, CdSe/CdS/CdZnS, CdSe/ZnS e/ZnS, CdSeS/CdS/ZnS, CdSeS/CdS/CdZnS, CdSeS/CdZnS/ZnS, CdSeS/ZnSe/ZnS, CdSeS/ZnSe/CdZnS, CdSeS/ZnS/CdZnS, CdSe/ZnS/CdS, CdSeS/ZnS/CdS, CdS e/ZnSe/CdZnS, InP/ZnS e/ZnS, InP/CdS/ZnSe/ZnS, InP/CdS/ZnS, InP/ZnS/CdS, InP/GaP/ZnS, InP/GaP/ZnSe, InP/CdZnS/ZnS, InP/ZnS/CdZnS, InP/CdS/CdZnS, InP/ZnSe/CdZnS, InP/ZnS/ZnSe, InP/GaP/ZnSe/ZnS, InP/ZnS/ZnSe/ZnS, nanoplatelets or quantum dots, or a mixture thereof.

[1795] The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with organic nanoparticles, inorganic nanoparticles such as metal nanoparticles, halide nanoparticles, chalcogenide nanoparticles, phosphide nanoparticles, sulfide nanoparticles, metalloid nanoparticles, metallic alloy nanoparticles, phosphor nanoparticles, perovskite nanoparticles, ceramic nanoparticles such as for example oxide nanoparticles, carbide nanoparticles, nitride nanoparticles, or a mixture thereof.

[1796] The same procedure was carried out by replacing ZnTe with ZnS or ZnSe, or a mixture thereof.

[1797] The same procedure was carried out by replacing ZnTe with a metal material, halide material, chalcogenide material, phosphide material, sulfide material, metalloid material, metallic alloy material, ceramic material such as for example oxide, carbide, nitride, glass, enamel, ceramic, stone, precious stone, pigment, cement and/or inorganic polymer, or a mixture thereof.

Example 24: Composite Particles Preparation from an Organometallic PrecursorCdSe/CdZnS@ZnS

[1798] 100 L of CdSe/CdZnS nanoplatelets suspended in heptane were mixed with an organometallic precursor selected in the group below in pentane under inert atmosphere, then loaded on a spray-drying set-up. On another side, a vapor source of H.sub.2S was inserted in the same spray-drying set-up. The suspension was sprayed towards a tube furnace heated from RT to 300 C. with a nitrogen flow. The composite particles were collected at the surface of a filter.

[1799] The procedure was carried out with an organometallic precursor selected in the group comprising: dimethyl zinc, trimethyl zinc, diethylzinc, Zn[(N(TMS).sub.2].sub.2, Zn[(CF.sub.3SO.sub.2).sub.2N].sub.2, Zn(Ph).sub.2, Zn(C.sub.6F.sub.5).sub.2, Zn(TMHD).sub.2 (-diketonate). Reaction temperature of the above procedure is adapted according to the organometallic precursor chosen.

[1800] The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with CdSe, CdS, CdTe, CdSe/CdS, CdSe/ZnS, CdSe/CdZnS, CdS/ZnS, CdS/CdZnS, CdTe/ZnS, CdTe/CdZnS, CdSeS/ZnS, CdSeS/CdS, CdSeS/CdZnS, CuInS.sub.2/ZnS, CuInSe.sub.2/ZnS, InP/CdS, InP/ZnS, InZnP/ZnS, InP/ZnSeS, InP/ZnSe, InP/CdZnS, CdSe/CdZnS/ZnS, CdSe/ZnS/CdZnS, CdSe/CdS/ZnS, CdSe/CdS/CdZnS, CdSe/ZnS e/ZnS, CdSeS/CdS/ZnS, CdSeS/CdS/CdZnS, CdSeS/CdZnS/ZnS, CdSeS/ZnSe/ZnS, CdSeS/ZnSe/CdZnS, CdSeS/ZnS/CdZnS, CdSe/ZnS/CdS, CdSeS/ZnS/CdS, CdS e/ZnSe/CdZnS, InP/ZnS e/ZnS, InP/CdS/ZnSe/ZnS, InP/CdS/ZnS, InP/ZnS/CdS, InP/GaP/ZnS, InP/GaP/ZnSe, InP/CdZnS/ZnS, InP/ZnS/CdZnS, InP/CdS/CdZnS, InP/ZnSe/CdZnS, InP/ZnS/ZnSe, InP/GaP/ZnSe/ZnS, InP/ZnS/ZnSe/ZnS, nanoplatelets or quantum dots, or a mixture thereof.

[1801] The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with organic nanoparticles, inorganic nanoparticles such as metal nanoparticles, halide nanoparticles, chalcogenide nanoparticles, phosphide nanoparticles, sulfide nanoparticles, metalloid nanoparticles, metallic alloy nanoparticles, phosphor nanoparticles, perovskite nanoparticles, ceramic nanoparticles such as for example oxide nanoparticles, carbide nanoparticles, nitride nanoparticles, or a mixture thereof.

[1802] The same procedure was carried out by replacing ZnS with ZnSe or ZnTe, or a mixture thereof.

[1803] The same procedure was carried out by replacing ZnS with a metal material, halide material, chalcogenide material, phosphide material, sulfide material, metalloid material, metallic alloy material, ceramic material such as for example oxide, carbide, nitride, glass, enamel, ceramic, stone, precious stone, pigment, cement and/or inorganic polymer, or a mixture thereof.

[1804] The same procedure was carried out by replacing H.sub.2S with H.sub.2Se, H.sub.2Te or other gas.

Example 25: InP/ZnS@SiO.SUB.2 .Prepared by Reverse Microemulsion Method Vs InP/ZnS@SiO.SUB.2 .Prepared by the Method of the Invention

[1805] InP/ZnS@SiO.sub.2 prepared by reverse microemulsion: InP/ZnS core/shell quantum dots (70 mg) were mixed with 0.1 mL of (3-(trimethoxysilyl)propyl methacrylate (TMOPMA), followed by 0.5 mL of triethylorthosilicate (TEOS) to form a clear solution, which was kept for incubation under N.sub.2 overnight. The mixture was then injected into 10 mL of a reverse microemulsion (cyclohexane/CO-520, 18 ml/1.35 g) in 50 mL flask, under stirring at 600 rpm. The mixture was stirred for 15 mins and then 0.1 mL of 4% NH.sub.4OH was injected to start the bead forming reaction. The reaction was stopped the next day and the reaction solution was centrifuged to collect the solid phase. The obtained particles were washed twice with 20 mL cyclohexane and then dried under vacuum.

[1806] FIG. 13A-B show TEM picture of InP/ZnS@SiO.sub.2 prepared by reverse microemulsion. It is clear from the TEM pictures that nanoparticles encapsulated in an inorganic material via reverse microemulsion method cannot be and are not uniformly dispersed in said inorganic material.

[1807] FIG. 13A-B also show that the reverse microemulsion method does not lead to discrete particles but to a matrix of inorganic material.

Example 26: CdSe/CdS/ZnS@SiO.SUB.2 .Prepared by Method of Prior Art Vs CdSe/CdS/ZnS @SiO.SUB.2 .Prepared by the Method of the Invention

[1808] 0.6 mL of a suspension comprising CdSe/CdS/ZnS nanoplatelets having an emission wavelength at 694 nm and 6.2 mL of a perhydropolysilazane solution (solution of 18.6% by weight of dibutylether) were mixed in a beaker to prepare a mixed solution. Thereafter, the mixed solution was poured into a Teflon-coated container and naturally dried at room temperature for 24 hours while light was blocked out. The dried cured product was gathered, pulverized into a powder using a mortar and a pestle, and then dried at 60 C. for 7 hours and 30 minutes in an oven.

[1809] FIG. 13C-D show TEM picture of CdSe/CdS/ZnS@SiO.sub.2 prepared the method hereabove. It is clear from the TEM pictures that nanoparticles encapsulated in an inorganic material via said method cannot be and are not uniformly dispersed in said inorganic material.

[1810] FIG. 13C-D also show that said method does not lead to discrete particles but to a matrix of inorganic material.

REFERENCES

[1811] 1Obtained particle [1812] 11Core of particle [1813] 12Shell of particle [1814] 2Inorganic material [1815] 21Inorganic material [1816] 3Nanoparticle [1817] 31Spherical nanoparticle [1818] 322D nanoparticle [1819] 33Core of a nanoparticle [1820] 34Shell of a nanoparticle [1821] 35Shell of a nanoparticle [1822] 36Insulator shell of a nanoparticle [1823] 37Crown of a nanoparticle [1824] 4Device [1825] 41Gas supply [1826] 411Gas supply [1827] 412Gas supply [1828] 413Valve [1829] 42First means for forming droplets of a first solution [1830] 421First spray of droplets [1831] 43Second means for forming droplets [1832] 421Second spray of droplets [1833] 44Means for heating the droplets [1834] 441Tube [1835] 45Connecting means [1836] 46Means for cooling the at least one particle [1837] 47Means for separating and collecting the at least one particle [1838] 48Pumping device [1839] 49Container [1840] 5Mixing chamber