The present invention relates to an electronic device, comprising: —a GFET; —noise suppression means comprising: —a modulation unit applying to a gate (G) of the GFET a signal V.sub.g with frequency f.sub.m to modulate charge carrier density of a graphene channel around the charge neutrality point between charge carrier density values at frequency f.sub.m, —a control unit (CU), and —a demodulation circuit which is CMOS-implemented and that: —comprises first and second circuital branches alternately switchable to demodulate an electrical signal of frequency f.sub.m; or —is configured to generate and apply a signal V.sub.b with frequency f.sub.mb to a source (S) of the GFET continuously, simultaneously and with a delay t.sub.d to induce a phase with respect to V.sub.g to yield a maximal demodulated output signal (So). The present invention also concerns to a method for suppressing noise for the device of the invention.

The present invention relates to an electronic device, comprising: —a GFET; —noise suppression means comprising: —a modulation unit applying to a gate (G) of the GFET a signal V.sub.g with frequency f.sub.m to modulate charge carrier density of a graphene channel around the charge neutrality point between charge carrier density values at frequency f.sub.m, —a control unit (CU), and —a demodulation circuit which is CMOS-implemented and that: —comprises first and second circuital branches alternately switchable to demodulate an electrical signal of frequency f.sub.m; or —is configured to generate and apply a signal V.sub.b with frequency f.sub.mb to a source (S) of the GFET continuously, simultaneously and with a delay t.sub.d to induce a phase with respect to V.sub.g to yield a maximal demodulated output signal (So). The present invention also concerns to a method for suppressing noise for the device of the invention.

Systems and method for producing graphene on a substrate are described. Certain types of exemplar systems include lateral arrangements of a substrate gas scavenging environment and an annealing environment. Certain other types of exemplar systems include lateral arrangements of a graphene producing environment and a cooling environment, which cools the graphene produced on the substrate. Yet other types of exemplar systems include lateral arrangements of a localized annealing environment, localized graphene producing environment and a localized cooling environment inside the same enclosure. Certain type of exemplar methods for producing graphene on a substrate include scavenging a first portion of the substrate and preferably, contemporaneously annealing a second portion of the substrate. Certain other type of exemplar methods for producing graphene include novel annealing techniques and/or implementing temperature profiles and gas flow rate profiles that vary as a function of lateral distance and/or cooling graphene after producing it.

A electronic method, includes receiving, by a graphene structure, a microwave signal. The microwave signal has a driving voltage level. The electronic method includes generating, by the graphene structure, optical photons based on the microvolts. The electronic method includes outputting, by the graphene structure, the optical photons.

A electronic method, includes receiving, by a graphene structure, a microwave signal. The microwave signal has a driving voltage level. The electronic method includes generating, by the graphene structure, optical photons based on the microvolts. The electronic method includes outputting, by the graphene structure, the optical photons.

Provided is directionally-arranged graphene heat-conducting foam, directionally-arranged graphene heat-conducting film, preparation methods of the directionally-arranged graphene heat-conducting foam and the directionally-arranged graphene heat-conducting film, and an electronic product. For the preparation method of graphene heat-conducting foam, after part of the graphene oxide slurry is preliminarily directionally molded in freezing condition with an array grid with specific structure and tank, the array grid is separated from the part of the graphene oxide slurry, to obtain the first graphene oxide, then the other part of the graphene oxide slurry is injected to gaps and an upper surface of the first graphene oxide, then the graphene oxide slurry is frozen and dried, to obtain second graphene oxide, and finally, the carbonization and graphitization treatment is performed on the second graphene oxide, to obtain the directionally-arranged graphene heat-conducting foam. Graphene heat-conducting film is prepared by pressing the above graphene heat-conducting foam.

A carbon material with excellent characteristics is provided. An electrode having excellent characteristics can be provided. A novel carbon material can be provided. A novel electrode can be provided. A graphene compound including a vacancy includes a plurality of carbon atoms and one or more fluorine atoms, and the vacancy is formed with the plurality of carbon atoms and one or more fluorine atoms. The vacancy includes a ring-shaped region composed of the plurality of carbon atoms, and one or more fluorine atoms terminated in the ring-shaped region, and the ring-shaped region is a 18- or more-membered ring.

A method for generating vapour bubbles in an object comprises introducing a composition into the object, the composition comprising carbon-based nano- or microparticles that can couple with a photon wave of electromagnetic radiation. The method also comprises irradiating said object using electromagnetic radiation. The irradiation thereby is adapted for using a set of carbon-based nano- or microparticles for subsequently forming first vapour bubbles and at least second vapour bubbles using the same carbon-based nano- or microparticles.

An apparatus containing at least one electrochemical cell with an electrode structure. The electrode structure contains at least one carbide chemical compound. The carbide chemical compound may be a salt-like carbide. The electrode may contain at least one electronically conductive element different from the carbide. Carbon compositions of various forms may be formed by the methods and apparatus using the electrode structure. Large pieces of pure carbon may be produced. Post-reaction processing of the carbon may be carried out such as exfoliation.

An apparatus containing at least one electrochemical cell with an electrode structure. The electrode structure contains at least one carbide chemical compound. The carbide chemical compound may be a salt-like carbide. The electrode may contain at least one electronically conductive element different from the carbide. Carbon compositions of various forms may be formed by the methods and apparatus using the electrode structure. Large pieces of pure carbon may be produced. Post-reaction processing of the carbon may be carried out such as exfoliation.