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.
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 0.25TPa?
Graphite paper composed of graphene sheets has many holes, so it is brittle. Functionalized graphene is obtained by oxidation, and then graphite paper made of functionalized graphene will be exceptionally strong and tough.
Optical characteristics:
Graphene has very good optical properties, the absorption rate is about 2.3% in a wide wavelength range, and it looks almost transparent. Within the range of several layers of graphene thickness, the absorption rate increases by 2.3% as the thickness of each layer increases. Large-area graphene films also have excellent optical properties, and their optical properties change with the change of graphene thickness.
This is an unusual low-energy electronic structure of single-layer graphene. At room temperature, the band gap of graphene can be adjusted from 0 to 0~0.25eV by applying voltage to the double-gate double-layer graphene field effect transistor. When a magnetic field is applied, the optical response of graphene nanoribbons can be tuned to the terahertz range.