What's Chinese standard number 1 for graphene?

On December 31, 2013, the China Graphene Standardization Committee officially released China's Graphene Standard No. 1 "Terminology and Definitions of Graphene Materials" and implemented it on January 1, 2014. This is the first standard in the world to explicitly give graphene key terms and definitions. The main drafting units of the standard are the Institute of Metals of the Chinese Academy of Sciences, Southeast University, Taizhou Graphene Research and Testing Platform, Taizhou Juna New Energy Co., Ltd. and the Institute of Semiconductors of the Chinese Academy of Sciences, Shanxi Institute of Coal Chemistry of the Chinese Academy of Sciences and Weixing Group Co., Ltd. participated in the drafting of the standard.

This standard is applicable to the production, application, inspection, circulation, scientific research and other fields of graphene materials as a basis for harmonizing technical terms. The standard defines single-layer graphene, double-layer graphene, low-layer graphene, single-layer graphene oxide, single-layer reduced graphene oxide, functional graphene, graphene materials, etc. According to the standard definition, graphene is divided into three categories: single-layer graphene, double-layer graphene, and low-layer graphene, and the concept of "multi-layer graphene" used by the industry was not included.

Among them, graphene materials refer to two-dimensional carbon materials related to graphene that do not have more than 10 carbon atom layers; Single-layer graphene refers to a two-dimensional carbon material consisting of a layer of carbon atoms that are periodically tightly packed with a benzene ring structure(ie, a hexagonal Honeycomb structure); Double-layer graphene refers to a two-layer carbon atom layer that is periodically tightly packed with a benzene ring structure(ie, a hexagonal Honeycomb structure) in different stacking modes(including AB stacking, AA stacking, AA stacking, etc.). A two-dimensional carbon material; Low-level graphene refers to a type of carbon atom layer consisting of a 3-10 layer with a benzene ring structure (ie, a hexagonal Honeycomb structure) that is periodically tightly packed with different stacking methods(including ABC stacking, ABA stacking, etc.). Two-dimensional carbon material; Single-layer graphene oxide refers to a two-dimensional carbon material with oxygen-containing functional groups(groups) attached to the surface and boundary of single-layer graphene; Single-layer reduction graphene oxide refers to a two-dimensional carbon material obtained(by chemical or thermal treatment, etc.) by not completely removing oxygen-containing functional groups(groups) in single-layer graphene oxide; Functional graphene refers to graphene containing heteroatoms/molecules(such as hydrogen, fluorine, oxygen-containing groups, etc., surface modified into bonds, nitrogen, boron and other elements substituted doping, heteroatom/molecular intercalation, etc.) A two-dimensional carbon material, Including graphene oxide and reduced graphene oxide. More than 10 layers are not in the definition of graphene, and the 10-layer boundary is because the electronic band structure of the 10-layer single-layer graphene has approached its three-dimensional limit.

At present, the research and development of graphene in China has continued to deepen, and the production and application of graphene has gradually entered the industrialization stage. Various graphene research units and companies have not yet reached a consensus on the definition, properties, preparation methods, detection and characterization methods of graphene and other industrial technology core issues. This has caused the development of the graphene industry and even exchanges between upstream and downstream enterprises. Can not be ignored. In view of the fact that the international graphene standard is still in a state of absence, the release of China's graphene standard No. 1 indicates that China's graphene standardization work has come to the forefront, and the Chinese standard of graphene is expected to be promoted to an international standard. This has important strategic significance for China to seize the right to make international graphene standards.

However, the definition of graphene released this time is relatively broad. Although it has a boost to industrialization, due to the large gap in the performance of single-layer, double-layer, and low-layer graphene, graphene, collectively referred to as graphene, is easily confused by manufacturers.

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