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Graphene is a honeycomb planar film formed by sp2 hybridization of carbon atoms. It is a quasi-two-dimensional material with only one atomic layer thickness, so it is also called monatomic layer graphite.
The common powder production method of graphene is mechanical stripping method, oxidation reduction method, SiC epitaxial growth method, and film production method is chemical vapor deposition (CVD). Because of its very good strength, flexibility, conductivity, thermal conductivity, optical properties, graphene have been developed by leaps and bounds in physics, materials science, electronic information, computer, aerospace and other fields.
As a new type of nanomaterials with the most thin, the maximum intensity and most conductive conductivity, graphene is known as "black gold" and "king of new materials", scientists even predict that graphene will "completely change the 21st century " It is likely to set off a sweeping global disruptive new technology and new industrial revolution.
Physical and Chemical Properties:
Strength and flexibility: Tensile strength and elastic modulus is 125GPa and 1.1TPa, respectively. Young's modulus is about 42N / m2. The graphene layer with 1m2 can withstand 4 kg, the strength of which is about 100 times than the ordinary steel. The bags made of graphene can withstand about 2 tons of weight. Graphene is currently known to the most powerful material.
Conductive thermal conductivity: One of the most important properties of graphene is its unique carrier properties and the quality of the Dirac fermions.
Optical properties: The absorption rate of single layer graphene to visible light and near infrared band is only 2.3%, and is not selective to the absorption of light in all bands.
Oxidation: Reacts with active metals, or oxidized in air.
Reducibility: It can be oxidized by oxidizing acid, by which the graphene can be cut into small pieces.
Stability: The structure of graphene is very stable, carbon carbon bond is only 1.42. The connection between the carbon atoms inside the graphene is very flexible. When the external force is applied to the graphene, the carbon atoms are bent and deformed, so that the carbon atoms need not be rearranged to accommodate the external forces, thus maintaining the structural stability. In addition, when the electrons in the graphene move in the track, they do not scatter due to lattice defects or the introduction of foreign atoms. As the interatomic force is very strong, at room temperature, even if the surrounding carbon atoms crashed, the internal interference of graphene is very small.
Aromaticity: Graphene is aromatic and has aromatic properties.
Solubility: Good solubility in nonpolar solvents.
Other properties: Adsorption and desorption of various atoms and molecules, with super-hydrophobic and super-oleophilic.
With the gradual breakthrough of mass production and large size problems, the application of graphene industrialization is accelerating, based on existing research results, the first commercial application areas should be mobile equipment, aerospace, new energy battery.