A thermal interface material under a high vacuum condition includes a graphite sheet having a thickness of from 9.6 m to 50 nm and a thermal conductivity in an a-b surface direction at 25 C. of not less than 1000 W/mK.

Provided is a multi-layer graphitic laminate comprising at least two graphitic films or graphene layers and a layer of conductive adhesive disposed between the two graphitic films or graphene layers and bonded thereto, wherein the conductive adhesive layer comprises graphene sheets or expanded graphite flakes disperse in or bonded by an adhesive resin, and the graphene sheets or expanded graphite flakes occupy a weight fraction from 0.01% to 99% based on the total conductive adhesive weight.

The present invention relates to a surface-decorated flexible graphene self-heating gas sensor, which has a pattern of graphene formed on a flexible substrate, has a part of the pattern of graphene decorated with metal nanoparticles, and detects a gas by applying an external voltage.

A method of producing a graphite film has an excellent appearance and excellent thermal diffusivity. A graphite film production method includes the steps of: preparing a polyimide film having a heating loss rate X of 0.13% to 10%, which heating loss rate X is represented by: heating loss rate X=(ba)/a . . . Formula (1); and graphitizing the polyimide film by subjecting the polyimide film to a heat treatment. Where (i) a represents a mass of the polyimide film after the polyimide film is heated at 400 C. for 15 minutes and (ii) b represents a mass of the polyimide film after the polyimide film is heated at 150 C. for 15 minutes.

A preparation method of a graphene film prepared with flexible polyimide includes the following steps: S1, laminating a plurality of polyimide films; S2, performing heat treatment while pressing the laminated polyimide films for bonding, wherein the temperature of heat treatment is lower than the temperature at which a thermoplastic polyimide film begins thermal decomposition, so that the laminated polyimide films are bonded together to form a polyimide composite film; and S3, raising the temperature of the polyimide composite film to be higher than the temperature at which the polyimide film begins thermal decomposition for heat treatment and carbonization treatment, thereby obtaining a carbonized multifunctional film, and performing graphitization treatment as required. The graphene film prepared by the present invention has ultra-high thermal conductivity, excellent flexibility and bending resistance, anisotropy and good electrical boundary shielding effect and magnetic boundary shielding effect, and a good application prospect.

Provided is a graphene foam laminate for use as a sealing material, comprising: (a) a layer of graphene foam having a thickness from 100 nm to 10 cm and comprising pores and pore walls having a 3D network of interconnected graphene planes or graphene sheets; and (b) a permeation-resistant polymer layer disposed on a primary surface of the graphene foam to form a two-layer laminate or two permeation-resistant polymer layers disposed on the two primary surfaces of the graphene foam to form a three-layer sandwich laminate, wherein the permeation-resistant polymer layer has a thickness from 10 nm to 1 cm.

2-dimensional carbon thin films are described, as well as their processes of preparation, and their specific uses. The 2-dimensional carbon thin films are fabricated by preparing an organic polymeric thin film precursor, which is then subjected to a carbonisation process to remove at least some of the non-carbon atoms. Using the disclosed process, 2-dimensional carbon thin films having improved dimensional characteristics can be reliably prepared, which presents clear advantages in applications which have until now been restricted to the use of 2-dimensional carbon thin films having less useful dimensions.

Optimized 3-D graphene structures used to enhance thermal performance of the thermal systems such as vapor chambers are provided. The porosity of the wick/porous structure has a critical effect on the efficiency of a vapor chamber system. Graphene coating provides high thermal conductivity, and it has a high porous structure, which is favorable for vapor chamber devices.

Certain exemplary embodiments can provide a system, which can comprise ink or a rubber object comprising reactive graphene. The reactive graphene comprises a graphene core that is chemically bonded with a reactive shell. The graphene core is a graphene hybrid composite comprising graphene and one or more of nanocarbon, graphene nanoplatelets, graphene oxide, reduced graphene oxide and/or pristine graphene, etc.

A manufacturing method of a high thermal conductive hybrid film includes steps as follows. A graphene oxide solution including a plurality of graphene oxides is prepared. A nano-particle solution including a plurality of nano initial hybrid structures is prepared. A mixing process is provided, wherein the mixing process is for mixing the graphene oxide solution and the nano-particle solution to obtain a mixing solution. A preliminary-film forming process is provided, wherein the preliminary-film forming process is for filtrating the mixing solution and then remaining a mixture of the graphene oxides and the nano initial hybrid structures to form a preliminary film. A heating process is provided, wherein the heating process is for heating the preliminary-film to reduce the graphene oxides as a plurality of reduced graphene oxides and convert the nano initial hybrid structures into a plurality of nano hybrid structures.