Graphene is a material in which carbon atoms are closely packed into a single-layer two-dimensional honeycomb lattice structure. Graphene has excellent optical, electrical, and mechanical properties, and has important application prospects in materials science, micro-nano processing, energy, biomedicine, and drug delivery. It is considered a revolutionary material in the future.
In order to regulate the development of the graphene field, a more precise understanding of the concept of graphene is needed. In 2014, the China Graphene Standards Committee reviewed single-layer graphene, double-layer graphene, few-layer graphene, single-layer graphene oxide, and single-layer graphene oxide. Concepts such as reduced graphene oxide, functionalized graphene, and graphene materials are all defined.
Since the electronic energy band structure of the material has approached its three-dimensional limit when the number of graphene layers reaches 10 layers, the definition of graphene in the standard is all within 10 layers. Among them, single-layer graphene refers to a two-dimensional carbon material composed of a layer of carbon atoms arranged periodically and closely in a benzene ring structure (ie, hexagonal honeycomb structure).
Double-layer graphene refers to two layers of carbon atoms that are periodically and closely packed in a benzene ring structure (that is, a hexagonal honeycomb structure), and are composed of different stacking methods (including AB stacking, AA stacking, AA' stacking, etc.). Dimensional carbon materials.
The few layer graphene is a two-dimensional carbon composed of 3-10 layers of carbon atoms that are periodically and closely packed in a benzene ring structure (hexagonal honeycomb structure) in different stacking methods (including ABC stacking, ABA stacking, etc.) Material.
Single-layer graphene oxide refers to a two-dimensional carbon material with oxygen-containing functional groups attached to the surface and boundary of a single-layer graphene. Graphene oxide refers to a two-dimensional carbon material with oxygen-containing functional groups connected to the surface and boundary of at least one carbon atom layer on graphene. Graphene oxide includes the above-mentioned single-layer graphene oxide.
Single-layer reduced graphene oxide refers to a two-dimensional carbon material obtained by deoxidizing and reducing the single-layer graphene oxide by incomplete removal of oxygen-containing functional groups (groups) by chemical, electrochemical, or heat treatment methods.
Reduced graphene oxide refers to a two-dimensional carbon material obtained by deoxidizing and reducing the oxygen-containing functional groups (groups) in graphene oxide by chemical, electrochemical, or heat treatment methods. Reduced graphene oxide includes the above-mentioned single-layer reduced graphene oxide.
Functionalized graphene is a kind of graphene that contains heteroatoms/molecules (such as hydrogen, fluorine, oxygen-containing groups and other surface modification to form bonds, nitrogen, boron and other elements substitution doping, heteroatom/molecule intercalation) Etc.) a two-dimensional carbon material. Functionalized graphene includes the graphene oxide defined above and reduced graphene oxide.
In addition, the definition involves single-layer graphene, double-layer graphene, few-layer graphene, graphene, single-layer graphene oxide, graphene oxide, single-layer reduced graphene oxide, reduced graphene oxide, and functionalized graphene, etc. Both can be called graphene materials.
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