China overcomes technical difficulties Graphene enters the membrane era

Summary Recently, the aircraft industry Institute announced aircraft materials, has exceeded preparing large size, technical problems of high quality graphene thin film, the surface of the substrate material master grain oriented controlled growth and chemical vapor deposition (CVD) reaction gas partial pressure ratio And other key patent technologies, prepared on the surface of copper foil...
Recently, AVIC Aviation Materials announced that it has broken through the technical problems of preparing large-size, high-quality graphene films, and mastered the controlled grain growth of the substrate material surface and the chemical vapor deposition (CVD) reaction gas partial pressure ratio. Key patent technology, more than 12 inches of graphene film is prepared on the surface of copper foil; larger size graphene film preparation technology has also been broken, and mass production will be carried out in the near future, so that the engineering preparation of large-size and high-quality graphene film becomes The reality marks the entry of graphene into the "membrane era."

Graphene is a single-layer sheet-like structure composed of carbon atoms. It is only one carbon atom in thickness. It is the world's thinnest material known and the hardest material to date. Its strength is steel. More than 100 times. At the same time, graphene is also the fastest electron transfer rate material in known materials, and it also has a light transmittance of 97.7% and excellent thermal conductivity. Due to the difficulty in preparation, graphene is currently 15 to 20 times more expensive than gold.

It is reported that the aviation materials institute invested tens of millions of yuan to solve the partial pressure ratio of reaction source gas and carrier gas, the uniformity of furnace temperature in CVD reaction chamber, the matching of transfer medium and carrier, and the target and graphene film. Four major problems, such as compatibility, effectively improve the integrity, cleanliness and product performance of graphene film, and can control the structure of single-layer, multi-layer or mixed layer of graphene film layers, achieving large size and high Batch production of quality graphene films. Graphene film production capacity can reach hundreds of pieces per day, and the aviation material institute has been in the leading position in the domestic production of large-size and high-quality graphene.

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