METHOD OF MAKING FIBER COMPRISING METAL NANOPARTICLES

Abstract

Provided is a method of making a fiber comprising metal nanoparticles. The method includes steps of: Step (A): providing a fiber and a metal salt aqueous solution comprising first metal ions; Step (B): making the metal salt aqueous solution contact the fiber to form a fiber containing the first metal ions; and Step (C): contacting the fiber containing the first metal ions with a second metal, and performing a reduction reaction of the first metal ions to obtain the fiber comprising metal nanoparticles, wherein the fiber comprising metal nanoparticles comprises first metal nanoparticles from a reduction of the first metal ions; wherein a standard reduction potential of the first metal ions is greater than a standard reduction potential of an ionic state of the second metal, and a difference therebetween ranges from 0.4 V to 4.0 V.

Claims

1. A method of making a fiber comprising metal nanoparticles, comprising steps of: Step (A): providing a fiber and a metal salt aqueous solution comprising first metal ions; Step (B): making the metal salt aqueous solution contact the fiber to form a fiber containing the first metal ions; and Step (C): contacting the fiber containing the first metal ions with a second metal, and performing a reduction reaction of the first metal ions to obtain the fiber comprising metal nanoparticles, wherein the fiber comprising metal nanoparticles comprises first metal nanoparticles from a reduction of the first metal ions; wherein a standard reduction potential of the first metal ions is greater than a standard reduction potential of an ionic state of the second metal, and a difference therebetween ranges from 0.4 volts to 4.0 volts.

2. The method of making the fiber comprising metal nanoparticles as claimed in claim 1, wherein the first metal ions comprise gold ions, platinum ions, silver ions, copper ions, iron ions, zinc ions or titanium ions.

3. The method of making the fiber comprising metal nanoparticles as claimed in claim 2, wherein a concentration of the first metal ions of the metal salt aqueous solution ranges from 1 μg/L to 90 g/L.

4. The method of making the fiber comprising metal nanoparticles as claimed in claim 1, wherein the second metal comprises magnesium metal, aluminum metal, manganese metal, titanium metal, zinc metal, iron metal, nickel metal, tin metal, copper metal or silver metal.

5. The method of making the fiber comprising metal nanoparticles as claimed in claim 1, wherein the step of making the metal salt aqueous solution contact the fiber is performed by a dipping method, a coating method, a spraying method or an automatic roll-pulling method.

6. The method of making the fiber comprising metal nanoparticles as claimed in claim 5, wherein the fiber is contacted with the metal salt aqueous solution by the dipping method for a contact time ranging from 0.1 second to 24 hours.

7. The method of making the fiber comprising metal nanoparticles as claimed in claim 1, wherein a reaction time of the reduction reaction ranges from 0.1 second to 24 hours.

8. The method of making the fiber comprising metal nanoparticles as claimed in claim 7, wherein Step (C) comprises: Step (c1): contacting the fiber containing the first metal ions with the second metal, and performing the reduction reaction of the first metal ions to obtain a first composite fiber, wherein the first composite fiber comprises the first metal nanoparticles; and Step (c2): leaving the first composite fiber to stand for 0.1 hour to 72 hours to obtain the fiber comprising metal nanoparticles; wherein a temperature of Step (c2) ranges from 0° C. to 120° C.

9. The method of making the fiber comprising metal nanoparticles as claimed in claim 8, wherein Step (c1) comprises: Step (c1-1): contacting the fiber containing the first metal ions with the second metal, and performing the reduction reaction of the first metal ions to produce a mixture having second metal ions, an unreacted second metal, and the first composite fiber comprising the first metal nanoparticles; and Step (c1-2): removing the unreacted second metal and the second metal ions from the mixture to obtain the first composite fiber.

10. The method of making the fiber comprising metal nanoparticles as claimed in claim 1, wherein an average size of the first metal nanoparticles ranges from 1 nm to 100 nm.

11. The method of making the fiber comprising metal nanoparticles as claimed in claim 1, wherein a content of the first metal nanoparticles on a surface of the fiber comprising metal nanoparticles ranges from 10 μg to 100 mg per square centimeter.

12. The method of making the fiber comprising metal nanoparticles as claimed in claim 1, wherein Step (C) comprises: Step (c1): contacting the fiber containing the first metal ions with the second metal, and performing the reduction reaction of the first metal ions to obtain a first composite fiber, wherein the first composite fiber comprises the first metal nanoparticles; Step (c1-b): making a metal salt aqueous solution containing third metal ions contact the first composite fiber to form a second composite fiber which contains the third metal ions, wherein the third metal ions are different from the first metal ions; and Step (c1-c): contacting the second composite fiber with a fourth metal, and performing a reduction reaction of the third metal ions to obtain the fiber comprising metal nanoparticles, wherein the fiber comprising metal nanoparticles comprises the first metal nanoparticles and third metal nanoparticles from a reduction of the third metal ions; wherein a standard reduction potential of the third metal ions is greater than a standard reduction potential of an ionic state of the fourth metal, and a difference therebetween ranges from 0.4 volts to 4.0 volts; the standard reduction potential of the first metal ions is greater than the standard reduction potential of the ionic state of the fourth metal.

13. The method of making the fiber comprising metal nanoparticles as claimed in claim 12, wherein the standard reduction potential of the first metal ions is greater than a standard reduction potential of the third metal ions.

14. The method of making the fiber comprising metal nanoparticles as claimed in claim 12, wherein the fourth metal is the same as the second metal.

15. The method of making the fiber comprising metal nanoparticles as claimed in claim 12, wherein an average size of the third metal nanoparticles ranges from 1 nm to 100 nm.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0043] FIG. 1A is a SEM image of the fiber comprising metal nanoparticles obtained in Example 1.

[0044] FIG. 1B is an EDS spectrum of the fiber comprising metal nanoparticles obtained in Example 1.

[0045] FIG. 2A is a SEM image of the fiber comprising metal nanoparticles obtained in Example 2.

[0046] FIG. 2B is an EDS spectrum of the fiber comprising metal nanoparticles obtained in Example 2.

[0047] FIG. 3A is a SEM image of the fiber comprising metal nanoparticles obtained in Example 3.

[0048] FIG. 3B is an EDS spectrum of the fiber comprising metal nanoparticles obtained in Example 3.

[0049] FIG. 4A is a SEM image of the fiber comprising metal nanoparticles obtained in Example 4.

[0050] FIG. 4B is an EDS spectrum of the fiber comprising metal nanoparticles obtained in Example 4.

[0051] FIG. 5A is a SEM image of the fiber comprising metal nanoparticles obtained in Example 5.

[0052] FIG. 5B is an EDS spectrum of the fiber comprising metal nanoparticles obtained in Example 5.

[0053] FIG. 6A is a SEM image of the fiber comprising metal nanoparticles obtained in Example 7.

[0054] FIG. 6B is an EDS spectrum of the fiber comprising metal nanoparticles obtained in Example 7.

[0055] FIG. 7 is an EDS spectrum of the fiber comprising metal nanoparticles obtained in Example 8.

DETAILED DESCRIPTION OF THE DISCLOSURE

[0056] Hereinafter, one skilled in the art can easily realize the advantages and effects of the instant disclosure from the following examples. Therefore, it should be understood that the descriptions proposed herein are just preferable examples for the purpose of illustrations only, not intended to limit the scope of the disclosure. Various modifications and variations could be made in order to practice or apply the instant disclosure without departing from the spirit and scope of the disclosure.

[0057] In the following Examples, all the reagents were reagent grade purchased from Acros Organics and were used without further purification.

[0058] Water is distilled or deionized for use as a solvent.

[0059] Instruments:

[0060] 1. Inductively couple plasma optical emission spectrometry (ICP-OES): Agilent 5100 manufactured by Agilent Technologies; and

[0061] 2. Scanning Electron Microscope (SEM): S-3000N manufactured by Hitachi, Ltd.

Example 1

[0062] 0.34 g of silver nitrate (AgNO.sub.3) was dissolved in 20 mL of ultrapure water and stirred continuously for 10 minutes to obtain 0.1 M AgNO.sub.3(aq). Subsequently, at room temperature (25° C.), a Tetoron fabric was dipped in 6.73 mL of the 0.1 M AgNO.sub.3(aq) for 2 minutes. The Tetoron fabric had an area of 5 cm.sup.2 and a weight of 1.92 g, and it was made by Tetoron fibers with an average diameter of 10.8 μm. During the dipping process, the Tetoron fibers of the Tetoron fabric were in contact with the 0.1 M AgNO.sub.3(aq) to form fibers containing silver ions, thereby obtaining Tetoron fabric containing silver ions.

[0063] Then, the Tetoron fabric containing silver ions was covered by a zinc metal foil with an area of 5 cm.sup.2 and a weight of 1.6 g for 15 minutes, so the silver ions of the Tetoron fabric underwent a reduction reaction on the surface of the Tetoron fabric.

[0064] After completion of the reduction reaction, the remaining zinc metal foil which was unreacted to become zinc ions was removed, and then the obtained Tetoron fabric was repeatedly washed with ultrapure water by an ultrasonicator for 5 times to ensure the remaining ions on the fiber surface (such as unreacted silver ions, zinc ions from the reaction, and nitrate ions) were removed.

[0065] After that, the Tetoron fabric was placed in an oven set at 90° C. and dried for 24 hours, so as to obtain a Fabric A which contained fibers comprising metal nanoparticles, and the metal nanoparticles were silver nanoparticles.

Example 2

[0066] 10 mg of chloroauric acid (HAuCl.sub.4) was dissolved in 99.99 g of ultrapure water and stirred continuously for 10 minutes to obtain 0.01 wt % HAuCl.sub.4(aq). Subsequently, at room temperature (25° C.), an activated carbon nonwoven fabric was dipped in 50 mL of the 0.01 wt % HAuCl.sub.4(aq) for 30 seconds. The activated carbon nonwoven fabric had an area of 25 cm.sup.2 and a weight of 0.38 g, and it was made by cellulose acetate fibers with an average diameter of 16.3 μm. During the dipping process, the cellulose acetate fibers of the activated carbon nonwoven fabric were in contact with the 0.01 wt % HAuCl.sub.4(aq) to form cellulose acetate fibers containing gold ions, thereby obtaining an activated carbon nonwoven fabric containing gold ions.

[0067] Then, both upper and lower surfaces of the activated carbon nonwoven fabric containing gold ions were respectively covered by two sheets of magnesium metal foils each with an area of 25 cm.sup.2 and a weight of 21 g for 15 minutes, so the gold ions of the activated carbon nonwoven fabric underwent a reduction reaction on the surface of the activated carbon nonwoven fabric.

[0068] After completion of the reduction reaction, the remaining magnesium metal foils which were unreacted to become magnesium ions (Mg.sup.2+) were removed, and then the obtained activated carbon nonwoven fabric was repeatedly washed with ultrapure water by an ultrasonicator for 5 times to ensure the remaining ions on the fiber surface were removed.

[0069] After that, the obtained activated carbon nonwoven fabric was placed in an oven set at 90° C. and dried for 24 hours, so as to obtain a composite activated carbon nonwoven fabric which contained gold nanoparticles.

[0070] 100 mg of AgNO.sub.3 was dissolved in 99.9 g of ultrapure water and stirred continuously for 10 minutes to obtain 0.1 wt % AgNO.sub.3(aq). Subsequently, at room temperature (25° C.), said composite activated carbon nonwoven fabric was dipped in 50 mL of the 0.1 wt % AgNO.sub.3(aq) for 30 seconds. During the dipping process, the cellulose acetate fibers of said composite activated carbon nonwoven fabric were in contact with the 0.1 wt % AgNO.sub.3(aq) to form cellulose acetate fibers containing silver ions, thereby obtaining a composite activated carbon nonwoven fabric containing silver ions.

[0071] Then, both upper and lower surfaces of the composite activated carbon nonwoven fabric were respectively covered by two sheets of magnesium metal foils each with an area of 25 cm.sup.2 and a weight of 21 g for 15 minutes, so the silver ions of the composite activated carbon nonwoven fabric underwent a reduction reaction on the surface of the composite activated carbon nonwoven fabric.

[0072] After completion of the reduction reaction, the remaining magnesium metal foil which was unreacted to become Mg.sup.2+ was removed, and then the obtained composite activated carbon nonwoven fabric was repeatedly washed with ultrapure water by an ultrasonicator for 5 times to ensure the remaining ions on the fiber surface were removed.

[0073] After that, said composite activated carbon nonwoven fabric was placed in an oven set at 90° C. and dried for 24 hours, so as to obtain a Fabric B which contained fibers comprising metal nanoparticles, and the metal nanoparticles were gold and silver nanoparticles.

Example 3

[0074] 15.7 g of gold(III) chloride trihydrate (HAuCl.sub.4.3H.sub.2O) was dissolved in 200 mL of ultrapure water and stirred continuously for 10 minutes to obtain 0.2 M HAuCl.sub.4(aq). Subsequently, at room temperature (25° C.), 200 mL of the 0.2 M HAuCl.sub.4(aq) was uniformly sprayed onto a nonwoven fabric. The nonwoven fabric had an area of 400 cm.sup.2 and a weight of 6.1 g, and it was made by PAN fibers with an average diameter of 10.1 μm. During the spraying process, the PAN fibers of the nonwoven fabric were in contact with the HAuCl.sub.4(aq) to form PAN fibers containing gold ions, thereby obtaining a nonwoven fabric containing gold ions.

[0075] Then, both upper and lower surfaces of the nonwoven fabric containing gold ions were respectively covered by two sheets of aluminum metal foils each with an area of 400 cm.sup.2 and a weight of 27 g for 15 minutes, so the gold ions of the nonwoven fabric underwent a reduction reaction on the surface of the nonwoven fabric.

[0076] After completion of the reduction reaction, the remaining aluminum metal foils which were unreacted to become aluminum ions (Al.sup.3+) were removed, and then the obtained nonwoven fabric was repeatedly washed with ultrapure water by an ultrasonicator for 5 times to ensure the remaining ions on the fiber surface were removed.

[0077] After that, the obtained nonwoven fabric was placed in an oven set at 90° C. and dried for 24 hours, so as to obtain a composite nonwoven fabric which contained gold nanoparticles. 4.24 mg of AgNO.sub.3 was dissolved in 10 mL of ultrapure water and stirred continuously for 10 minutes to obtain 2.5 mM AgNO.sub.3(aq). Subsequently, at room temperature (25° C.), 10 mL of the 2.5 mM AgNO.sub.3(aq) was uniformly sprayed onto said composite nonwoven fabric. During the spraying process, the PAN fibers of said composite nonwoven fabric were in contact with the 2.5 mM AgNO.sub.3(aq) to form PAN fibers containing silver ions, thereby obtaining a composite nonwoven fabric containing silver ions.

[0078] Then, both upper and lower surfaces of the composite nonwoven fabric were respectively covered by two sheets of aluminum metal foils each with an area of 400 cm.sup.2 and a weight of 27 g for 15 minutes, so the silver ions of the composite nonwoven fabric underwent a reduction reaction on the surface of the composite nonwoven fabric.

[0079] After completion of the reduction reaction, the remaining aluminum metal foil which was unreacted to become Al.sup.3+ was removed, and then the obtained composite nonwoven fabric was repeatedly washed with ultrapure water by an ultrasonicator for 5 times to ensure the remaining ions on the fiber surface were removed.

[0080] After that, said composite nonwoven fabric was placed in an oven set at 90° C. and dried for 24 hours, so as to obtain a Fabric C which contained fibers comprising metal nanoparticles, and the metal nanoparticles were gold and silver nanoparticles.

Example 4

[0081] 0.34 g of AgNO.sub.3 was dissolved in 20 mL of ultrapure water and stirred continuously for 10 minutes to obtain 0.1 M AgNO.sub.3(aq). Subsequently, at room temperature (25° C.), a moisture-wicking fabric was dipped in 1.5 mL of the 0.1 M AgNO.sub.3(aq) for 2 minutes. The moisture-wicking fabric had an area of 30 cm.sup.2 and a weight of 3.9 g, and it was made by PET fibers with an average diameter of 10.5 μm. During the dipping process, the PET fibers of the moisture-wicking fabric were in contact with the 0.1 M AgNO.sub.3(aq) to form PET fibers containing silver ions, thereby obtaining moisture-wicking fabric containing silver ions.

[0082] Then, the moisture-wicking fabric containing silver ions was covered by a titanium metal foil with an area of 30 cm.sup.2 and a weight of 3.3 g for 15 minutes, so the silver ions of the moisture-wicking fabric underwent a reduction reaction on the surface of the moisture-wicking fabric.

[0083] After completion of the reduction reaction, the remaining titanium metal foil which was unreacted to become titanium ions was removed, and then the obtained moisture-wicking fabric was repeatedly washed with ultrapure water by an ultrasonicator for 5 times to ensure the remaining ions on the fiber surface were removed.

[0084] After that, the moisture-wicking fabric was placed in an oven set at 90° C. and dried for 24 hours, so as to obtain a Fabric D which contained fibers comprising metal nanoparticles, and the metal nanoparticles were silver nanoparticles.

Example 5

[0085] 100 mg of chloroauric acid was dissolved in 99.99 g of pure water and stirred continuously for 10 minutes to obtain 0.1 wt % HAuCl.sub.4(aq). Subsequently, at room temperature (25° C.), an activated carbon nonwoven fabric was dipped in 50 mL of the 0.1 wt % HAuCl.sub.4(aq) for 30 seconds. The activated carbon nonwoven fabric had an area of 25 cm.sup.2 and a weight of 0.45 g, and it was made by Rayon fibers with an average diameter of 15.8 μm. During the dipping process, the Rayon fibers of the activated carbon nonwoven fabric were in contact with the 0.1 wt % HAuCl.sub.4(aq) to form Rayon fibers containing gold ions, thereby obtaining an activated carbon nonwoven fabric containing gold ions.

[0086] Then, both upper and lower surfaces of the activated carbon nonwoven fabric containing gold ions were respectively covered by two sheets of copper metal foils each with an area of 25 cm.sup.2 and a weight of 22.4 g for 15 minutes, so the gold ions of the activated carbon nonwoven fabric underwent a reduction reaction on the surface of the activated carbon nonwoven fabric.

[0087] After completion of the reduction reaction, the remaining copper metal foils which was unreacted to become copper ions were removed, and then the obtained activated carbon nonwoven fabric was repeatedly washed with ultrapure water by an ultrasonicator for 5 times to ensure the remaining ions on the fiber surface were removed.

[0088] After that, the obtained activated carbon nonwoven fabric was placed in an oven set at 90° C. and dried for 24 hours, so as to obtain a composite activated carbon nonwoven fabric which contained gold nanoparticles.

[0089] 100 mg of AgNO.sub.3 was dissolved in 99.9 g of ultrapure water and stirred continuously for 10 minutes to obtain 0.1 wt % AgNO.sub.3(aq). Subsequently, at room temperature (25° C.), said composite activated carbon nonwoven fabric was dipped in 50 mL of the 0.1 wt % AgNO.sub.3(aq) for 30 seconds. During the dipping process, the Rayon fibers of said composite activated carbon nonwoven fabric were in contact with the 0.1 wt % AgNO.sub.3(aq) to form Rayon fibers containing silver ions, thereby obtaining a composite activated carbon nonwoven fabric containing silver ions.

[0090] Then, both upper and lower surfaces of the composite activated carbon nonwoven fabric were respectively covered by two sheets of copper metal foils each with an area of 25 cm.sup.2 and a weight of 22.4 g for 15 minutes, so the silver ions of the composite activated carbon nonwoven fabric underwent a reduction reaction on the surface of the composite activated carbon nonwoven fabric.

[0091] After completion of the reduction reaction, the remaining copper metal foil which was unreacted to become copper ions was removed, and then the obtained composite activated carbon nonwoven fabric was repeatedly washed with ultrapure water by an ultrasonicator for 5 times to ensure the remaining ions on the fiber surface were removed.

[0092] After that, said composite activated carbon nonwoven fabric was placed in an oven set at 90° C. and dried for 24 hours, so as to obtain a Fabric E which contained fibers comprising metal nanoparticles, and the metal nanoparticles were gold and silver nanoparticles.

Example 6

[0093] 0.34 g of AgNO.sub.3 was dissolved in 20 mL of ultrapure water and stirred continuously for 10 minutes to obtain 0.1 M AgNO.sub.3(aq). Subsequently, at room temperature (25° C.), a nonwoven fabric which was set on an outer layer of the face mask was dipped in 2.25 mL of the 0.1 M AgNO.sub.3(aq) for 2 minutes. The nonwoven fabric had an area of 9 cm.sup.2 and a weight of 0.013 g, and it was made by PAN fibers with an average diameter of 16.1 μm. During the dipping process, the PAN fibers of the nonwoven fabric were in contact with the 0.1 M AgNO.sub.3(aq) to form PAN fibers containing silver ions, thereby obtaining nonwoven fabric containing silver ions.

[0094] Then, the nonwoven fabric containing silver ions was covered by a tin metal foil with an area of 9 cm.sup.2 and a weight of 5.2 g for 15 minutes, so the silver ions of the nonwoven fabric underwent a reduction reaction on the surface of the nonwoven fabric.

[0095] After completion of the reduction reaction, the remaining tin metal foil which was unreacted to become tin ions was removed, and then the obtained nonwoven fabric was repeatedly washed with ultrapure water by an ultrasonicator for 5 times to ensure the remaining ions on the fiber surface were removed.

[0096] After that, the nonwoven fabric was placed in an oven set at 90° C. and dried for 24 hours, so as to obtain a Fabric F which contained fibers comprising metal nanoparticles, and the metal nanoparticles were silver nanoparticles.

Example 7

[0097] 0.34 g of AgNO.sub.3 was dissolved in 20 mL of ultrapure water and stirred continuously for 10 minutes to obtain 0.1 M AgNO.sub.3(aq). Subsequently, at room temperature (25° C.), a gauze was dipped in 6.25 mL of the 0.1 M AgNO.sub.3(aq) for 2 minutes. The gauze had an area of 25 cm.sup.2 and a weight of 0.4 g, and it was made by bamboo fibers with an average diameter of 11.9 μm. During the dipping process, the bamboo fibers of the gauze were in contact with the 0.1 M AgNO.sub.3(aq) to form bamboo fibers containing silver ions, thereby obtaining gauze containing silver ions.

[0098] Then, the gauze containing silver ions was covered by a nickel metal foil with an area of 25 cm.sup.2 and a weight of 22.25 g for 15 minutes, so the silver ions of the gauze underwent a reduction reaction on the surface of the gauze.

[0099] After completion of the reduction reaction, the remaining nickel metal foil which was unreacted to become nickel ions was removed, and then the obtained gauze was repeatedly washed with ultrapure water by an ultrasonicator for 5 times to ensure the remaining ions on the fiber surface were removed.

[0100] After that, the gauze was placed in an oven set at 90° C. and dried for 24 hours, so as to obtain a Fabric G which contained fibers comprising metal nanoparticles, and the metal nanoparticles were silver nanoparticles.

Example 8

[0101] 100 mg of chloroauric acid was dissolved in 99.99 g of pure water and stirred continuously for 10 minutes to obtain 0.1 wt % HAuCl.sub.4(aq). Subsequently, at room temperature (25° C.), a gauze was dipped in 10 mL of the 0.1 wt % HAuCl.sub.4(aq) for 2 minutes. The gauze had an area of 25 cm.sup.2 and a weight of 0.4 g, and it was made by bamboo fibers with an average diameter of 11.9 During the dipping process, the bamboo fibers of the gauze were in contact with the 0.1 wt % HAuCl.sub.4(aq) to form bamboo fibers containing gold ions, thereby obtaining a gauze containing gold ions.

[0102] Then, the gauze containing gold ions was covered by a copper metal foil with an area of 25 cm.sup.2 and a weight of 22.4 g for 15 minutes, so the gold ions of the gauze underwent a reduction reaction on the surface of the gauze.

[0103] After completion of the reduction reaction, the remaining copper metal foils which were unreacted to become copper ions were removed, and then the obtained gauze was repeatedly washed with ultrapure water by an ultrasonicator for 5 times to ensure the remaining ions on the fiber surface were removed.

[0104] After that, the obtained gauze was placed in an oven set at 90° C. and dried for 24 hours, so as to obtain a composite gauze which contained gold nanoparticles.

[0105] 0.34 g of AgNO.sub.3 was dissolved in 20 mL of ultrapure water and stirred continuously for 10 minutes to obtain 0.1 M AgNO.sub.3(aq). Subsequently, at room temperature (25° C.), said composite gauze was dipped in 5 mL of the 0.1 M AgNO.sub.3(aq) for 2 minutes. During the dipping process, the bamboo fibers of said composite gauze were in contact with the 0.1 M AgNO.sub.3(aq) to form bamboo fibers containing silver ions, thereby obtaining a composite gauze containing silver ions.

[0106] Then, the composite gauze was covered by a copper metal foil with an area of 25 cm.sup.2 and a weight of 22.4 g for 15 minutes, so the silver ions of the composite gauze underwent a reduction reaction on the surface of the composite gauze.

[0107] After completion of the reduction reaction, the remaining copper metal foil which was unreacted to become copper ions was removed, and then the obtained composite gauze was repeatedly washed with ultrapure water by an ultrasonicator for 5 times to ensure the remaining ions on the fiber surface were removed.

[0108] After that, said composite gauze was placed in an oven set at 90° C. and dried for 24 hours, so as to obtain a Fabric H which contained fibers comprising metal nanoparticles, and the metal nanoparticles were gold and silver nanoparticles.

Example 9

[0109] 0.34 g of AgNO.sub.3 was dissolved in 20 mL of ultrapure water and stirred continuously for 10 minutes to obtain 0.1 M AgNO.sub.3(aq). Subsequently, at room temperature (25° C.), an electrostatic fabric was dipped in 10 mL of the 0.1 M AgNO.sub.3(aq) for 2 minutes. The electrostatic fabric had an area of 9 cm.sup.2 and a weight of 0.02 g, and it was made by polyester fibers with an average diameter of 10.8 μm. During the dipping process, the polyester fibers of the electrostatic fabric were in contact with the 0.1 M AgNO.sub.3(aq) to form polyester fibers containing silver ions, thereby obtaining electrostatic fabric containing silver ions.

[0110] Then, the electrostatic fabric containing silver ions was covered by a zinc metal foil with an area of 9 cm.sup.2 and a weight of 2.9 g for 15 minutes, so the silver ions of the electrostatic fabric underwent a reduction reaction on the surface of the electrostatic fabric.

[0111] After completion of the reduction reaction, the remaining zinc metal foil which was unreacted to become zinc ions was removed, and then the obtained electrostatic fabric was repeatedly washed with ultrapure water by an ultrasonicator for 5 times to ensure the remaining ions on the fiber surface were removed.

[0112] After that, the electrostatic fabric was placed in an oven set at 90° C. and dried for 24 hours, so as to obtain a Fabric I which contained fibers comprising metal nanoparticles, and the metal nanoparticles were silver nanoparticles.

[0113] Analysis of Characteristics of Fabrics Containing Fibers Comprising Metal Nanoparticles:

[0114] Fabrics A to I were sequentially analyzed by test methods described below. In order to ensure the experimental significance of the characteristic analysis, Fabrics A to I were each analyzed by the same test method. Therefore, it can be understood that the difference in characteristics of each of Fabrics A to I was mainly caused by the difference in fibers comprising metal nanoparticles of each of the fabrics.

[0115] Analysis 1:

[0116] FIGS. 1A to 6A were SEM images of Fabrics A to E obtained from Examples 1 to 5 and Fabric G obtained from Example 7 in order. FIG. 1A was taken at a magnification of 1500×; FIGS. 2A to 4A were respectively taken at a magnification of 5000×; FIG. 5A was taken at a magnification of 3000×; and FIG. 6A was taken at a magnification of 2000×. As shown in FIGS. 1A to 6A, metal nanoparticles were uniformly attached to the surface of the fibers. Moreover, the particle sizes of the metal nanoparticles on the fibers comprising metal nanoparticles contained in the Fabrics A to E and Fabric G were measured, and the average particle sizes were listed in Table 1.

Table 1: kinds and average particle sizes of the metal nanoparticles of the fibers comprising metal nanoparticles obtained from Examples 1 to 5 and 7

TABLE-US-00001 Kinds of the metal nanoparticles Example First/Third metal Average particle sizes (nm) No. nanoparticles First/Third metal nanoparticles Example 1 Ag 35.3 ± 10.2 Example 2 Au/Ag 39.4 ± 9.3/35.7 ± 9.7 Example 3 Au/Ag 33.4 ± 10.3/30.4 ± 7.4  Example 4 Ag 40.8 ± 8.6  Example 5 Au/Ag  38.5 ± 7.7/37.2 ± 10.2 Example 7 Ag 42.4 ± 10.5

[0117] Analysis 2: Elemental Analysis

[0118] Each of Fabrics A to I was cut into a sample with an area of 4 cm.sup.2. Next, each sample was dissolved in suitable conditions based on the kinds of the metal nanoparticles contained therein. Then, each sample was subjected to an elemental analysis by ICP-OES, thereby obtaining the concentrations of the kinds of the metal nanoparticles.

[0119] Then, based on the results of SEM combined with EDS elemental semi-quantitative analysis and mass loss analysis by thermogravimetric analysis (TGA), the spectral peak intensities of different line systems corresponding to different elements and the response values of said specific element were selected to calculate the concentration of each kind of metal nanoparticle. Subsequently, the concentration of each kind of metal nanoparticle was converted to the metal content per unit surface area of the fiber comprising metal nanoparticles, and the results were listed in Table 2.

Table 2: fiber diameters, kinds of the metal nanoparticles and the concentrations and metal content per unit surface area of the fiber comprising metal nanoparticles obtained from Examples 1 to 9

TABLE-US-00002 Metal content per unit surface area of the fiber Concentration comprising Fiber Kinds of of the metal metal Example diameter the metal nanoparticles nanoparticles No. (μm) nanoparticles (ppm) (μg/cm.sup.2) Example 1 10.8 Ag 0.838 16.7 Example 2 16.3 Au 5.038 12.5 Ag 15.14 37.8 Example 3 10.1 Au 1.451 3.6 Ag 11.94 29.8 Example 4 10.5 Ag 0.606 20.2 Example 5 15.8 Au 4.071 10.1 Ag 11.739 29.3 Example 6 16.1 Ag 0.606 67 Example 7 11.9 Ag 0.179 7.16 Example 8 11.9 Au 0.503 1.25 Ag 1.002 2.5 Example 9 10.8 Ag 0.791 87

[0120] Analysis 3: Test for Antimicrobial Activity

[0121] According to the standard method JISZ 2801, each of Fabrics A to I was subjected to an antibacterial test. The test was a quantitative analysis, which mainly calculated the antibacterial rate based on the difference in the number of bacteria before and after the bacterial culture was carried out. The test strain used in this test was BCRC10451 Staphylococcus aureus. The evaluation points of the Fabric A, Fabric C to Fabric I of Examples 1, 3 to 9 were 24 hours after incubation; besides, the evaluation point of the Fabric B of Examples 2 was 6 hours after incubation. The antibacterial rates of Examples 1 to 9 were listed in Table 3.

Table 3: fiber diameters, kinds of the metal nanoparticles and the concentrations and metal content per unit surface area of the fiber comprising metal nanoparticles obtained from Examples 1 to 9

TABLE-US-00003 Metal content per unit surface area of the fiber Kinds of the comprising metal Example Kinds of metal nanoparticles Antibacterial No. the fiber nanoparticles (μg/cm.sup.2) rate (%) Example 1 Tetoron Ag 16.7 98.1 ± 0.7 Example 2 cellulose Au 12.5 95.3 ± 0.1 acetate Ag 37.8 Example 3 PAN Au 3.6 98.7 ± 0.9 Ag 29.8 Example 4 PET Ag 20.2 98.5 ± 1.2 Example 5 Rayon Au 10.1 94.8 ± 0.4 Ag 29.3 Example 6 PAN Ag 67 96.4 ± 2.2 Example 7 Bamboo Ag 7.16 96.4 ± 2.2 Example 8 Bamboo Au 1.25 95.8 ± 0.3 Ag 2.5 Example 9 Polyester Ag 87 97.8 ± 1.7

[0122] Analysis 4: Adhesive Strength Test

[0123] According to the fastness to washing of the standard method AATCC 135, each of Fabrics A to I was subjected to be repeatedly washed 20 times. All test results of Fabrics A to I were “passed.”

[0124] Discussion of the Results

[0125] Based on the experimental results of Examples 1 to 9, it demonstrates that the method of making a fiber comprising metal nanoparticles of the instant disclosure can be implemented in room temperature environment without any expensive equipment. It proves that the instant disclosure has the advantages of cost-effectiveness, low energy consumption, low heat pollution, environment-friendliness and safety.

[0126] In addition, since Examples 1 to 9 did not require the use of complicated instruments or complicated operation settings, the fibers comprising metal nanoparticles can be easily obtained. It demonstrates that the instant disclosure has the advantages of simplicity and is conducive to mass production.

[0127] Furthermore, from the raw materials of the fibers of Examples 1 to 9, the instant disclosure can be applied to various fibers, as long as the first metal ions and the second metals meet a specific range of the difference in standard reduction potential. Therefore, it has the advantages of wide application fields and more commercial implementation potential.

[0128] In addition, from the analysis results in Table 3, it demonstrates that the Fabrics A to I including the fiber comprising metal nanoparticles produced by the instant disclosure all have good antibacterial rates.

[0129] Since all of Fabrics A to I of Examples 1 to 9 passed the test of fastness to washing, it demonstrates that the fiber comprising metal nanoparticles produced by the instant disclosure has the advantage of strong bonding between the metal nanoparticles and the fiber.

[0130] Even though numerous characteristics and advantages of the instant disclosure have been set forth in the foregoing description, together with details of the structure and features of the disclosure, the disclosure is illustrative only. Changes may be made in the details, especially in matters of shape, size, and arrangement of parts within the principles of the disclosure to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.