How is graphene prepared in the graphene dispersion preparation kit?

Graphene dispersion system, graphene (Graphene) is a two-dimensional material consisting of carbon atoms with sp2 hybrid orbitals composed of hexagonal honeycomb lattice flat films, only a carbon atom thickness. Graphene is currently the hardest nanomaterial in the world. It is almost transparent, absorbing only 2.3% of light. The thermal conductivity is as high as 5300W/m, higher than carbon nanotubes and diamond, the electron mobility at room temperature is more than 15000cm2/Vs, and higher than carbon nanotubes or silicon crystals, and the electrical resistivity is only about 10-8Ω/m, lower than copper or silver, for the world's smallest resistivity materials. Graphene has excellent electrical conductivity, thermal conductivity and mechanical strength. The composite material made from graphene and EP can give full play to the advantages of both, showing that the thermal conductivity, electromagnetism, tensile strength and modulus of the composite material are significantly improved. Graphene dispersion preparation.

How is graphene prepared?

There are mainly the following :

1. Advantages of mechanical stripping method: the preparation cost is very low (almost negligible), easy to learn, and the graphene obtained by this method is very good quality, few defects, excellent performance Disadvantages: the size of the obtained graphene is small, generally between 10-100um, and it is impossible to prepare on a large scale.

2. Advantages of SiC epitaxial growth: it can grow in a large size (4 inches in size has been reported), and the graphene obtained has excellent performance. Disadvantages: high raw material cost, high equipment cost, high growth temperature (1400°), general equipment can not reach, and it is difficult to grow graphene of too large size.

3. Advantages of graphite oxide reduction method: simple method, low raw material cost, basically no equipment cost, and easy to scale preparation disadvantages: the graphene obtained by this method has many defects, electrical and mechanical properties are poor.

4.CVD, the advantages of chemical vapor deposition method: the single growth size can be large (nearly 20 inches), it is possible to scale production, and the grown graphene has good performance and few defects. Disadvantages: transfer is difficult, and the grown graphene is generally polycrystalline.