A coating layer for a substrate includes a coating material. The coating material includes graphene and/or graphene derivatives that reflect and/or absorb an electromagnetic (EM) wave having a frequency of above 20 GHz. The coating layer is deposited on a surface of the substrate.

Provided are a wiring including a graphene layer and a method of manufacturing the wiring. The method may include growing a graphene layer on a substrate and doping the graphene layer with a metal. The graphene layer may be grown using a plasma of a hydrocarbon at a temperature of about 200° C. to about 600° C. by plasma enhanced chemical vapor deposition (PECVD).

The present invention discloses a preparation method of 2,6-diaminoanthraquinone bifunctional covalently grafted graphene as a negative material of a supercapacitor, which includes: first dispersing graphite oxide in deionized water; after stirring and ultrasonic treatment, reducing the graphite oxide into reduced graphene oxide by using a hydrazine hydrate, and vacuum drying at 40-80° C.; dispersing the reduced graphene oxide in a DMF solution with 2,6-diaminoanthraquinone, and stirring and performing the ultrasonic treatment again; at 60-90° C., adding isoamyl nitrite, and reacting for 18-24 h; and washing reaction products with ethanol and deionized water for multiple times, and finally freeze drying to obtain a product.

A method, including irradiating graphene oxide (GO) with a beam of light or radiation to form reduced graphene oxide (RGO) in a three-dimensional (3D) pattern, wherein the RGO is porous RGO with pores having sizes tuned by controlling the beam of light or radiation.

The disclosure relates to a nitrogen-doped graphitic nanoplate, and in particular to a nitrogen-doped graphitic nanoplate including, based on 100 parts by weigh of the nitrogen-doped graphitic nanoplate, 72 to 80 parts by weight of carbon; 12 to 15 parts by weight of nitrogen; and 0 to 3 parts by weight of by-product. The nitrogen-doped graphitic nanoplate barely includes by-product to enable to restrain changes in material property and may be applied to catalyst supports, energy, fuel cells, etc.

Functionally graded graphene materials, methods of making and uses thereof are described.

A method is disclosed for preparation of nitrogen-doped graphene having these steps: a) providing a dispersion of fluorinated graphite; b) subjecting the dispersion of fluorinated graphite to sonication and/or mechanical treatment and/or thermal treatment; c) contacting the product from step b) with an azide reagent at a temperature within the range of 40 to 200° C.; d) separating the solid product formed in step c) from the mixture; e) dialyzing the product obtained in step d) against water. A nitrogen-doped graphene containing at least 8.9 at. % of nitrogen and up to 16.6 at. % of fluorine is yielded, wherein the at. % are relative to the total atoms present in the sample and determined by X-ray photoelectron spectroscopy (XPS) using an Al-Kα source; and having a density above 1.2 g/cm3 when pressed at 80 kN for 1 min. This nitrogen-doped graphene is particularly useful as a supercapacitor material.

A graphene composite film is produced for application to the anode of a battery. A graphene dispersion is peeled off of a graphite solvent mixture ultrasonically. The graphene material is then mixed with organic amine salt to be charged. Electrophoretic deposition is used to turn the graphene into a film. The film is then passed through a heat treatment to remove the organic amine salt. The resulting film is a highly conductive graphene film with a two-dimensional structure.

The invention provides liquid compositions comprising conductive carbon particles and/or carbon nanoparticles, a thickening agent, and a solvent. The carbon nanoparticles are preferably a mixture of graphite nanoplatelets and carbon nanotubes and the thickening agent is preferably a cellulose derivative. The liquid compositions can be used as ink to print highly conductive films that adhere to paper substrates.

A graphene oxide-based membrane There is provided a graphene oxide-based membrane comprising a substrate and a plurality of layers of single-layered graphene oxide formed on the substrate, each of the plurality of layers of single-layered graphene oxide is functionalised by at least one diamine functional group, wherein interlayer spacing between two adjacent layers of single-layered graphene oxide is ≤ 10 Å. The membrane may be comprised in an electrocapacitive unit. There is also provided a method of forming the membrane.