Graphene has excellent optical, electrical and mechanical properties, and has important application prospects in the fields of material science, micro-nano processing, energy, biomedicine and drug delivery, and is considered as a revolutionary material in the future.
Physicists Andrei Grimm and Konstantin Novoselov of the University of Manchester in England successfully separated graphene from graphite by micromachining, so * * * won the 20 10 Nobel Prize in Physics. The common methods of graphene powder production are mechanical stripping, redox and SiC epitaxial growth, and the method of thin film production is chemical vapor deposition (CVD).
Extended data mechanical properties
Graphene is one of the strongest materials known. At the same time, it has good toughness and can be bent. The theoretical Young's modulus of graphene reaches 1.0 TPA, and the inherent tensile strength is 1.30 GPA. The reduced graphene modified by hydrogen plasma also has very good strength, and the average modulus can reach 0.25 MPa[7]. The graphite paper composed of graphene sheets has many holes, so it is very fragile. The functionalized graphene obtained by oxidation and then made into graphite paper will be extremely strong.
electronic effect
The carrier mobility of graphene at room temperature is about15000 cm2/(v s), which is more than 10 times that of silicon material and more than twice that of indium antimonide (InSb) with the highest carrier mobility. Under certain conditions, such as low temperature, the carrier mobility of graphene can even be as high as 250,000 cm2/(v s).
Unlike many materials, the electron mobility of graphene is less affected by temperature changes. At any temperature between 50 and 500 K, the electron mobility of single-layer graphene is about15000 cm2/(v s).
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