Cutting-edge technology - graphene

Graphene is a new material with sp² hybrid connected carbon atoms tightly packed into a single two-dimensional honeycomb lattice structure. Graphene has excellent optical, electrical and mechanical properties, and has important application prospects in materials science, micro and nano processing, energy, biomedicine and drug delivery, and is considered to be a revolutionary material in the future.

Classification of graphene

There are two kinds of classification of graphene, one is according to the number of layers, can be divided into single layer, double layer, less layer and multi-layer four categories of products; The other according to the product form can be divided into powder, slurry, film three categories of products.

Graphene powder and graphene film are the two main forms of graphene materials at present. The former is mostly doped in other materials and is mostly used in coatings and lithium-ion batteries. Graphene films are widely used in the fields of electronics, photonics and optoelectronic devices due to their advantages of transparency, conductivity and flexibility.

Properties of graphene

1. Thinnest and toughest

A single layer of graphene is only 0.335 nanometers thick, which is 1/200,000th the diameter of a human hair.

2. The most conductive

As an ideal two-dimensional crystal material, graphene has electrons traveling at 1/300 of the speed of light and an electrical conductivity of 10^6.

3. The highest carrier mobility

The internal carrier mobility of graphene can reach 2 × 10^5 cm^2 /Vs, which is 140 times that of the electron mobility in silicon.

4. Best thermal conductivity

Graphene is the material with the highest known thermal conductivity, with a theoretical thermal conductivity of 5300 W/mK, which is the best material for conducting heat at room temperature.

5. High light transmission

Single-layer graphene has a light absorption rate of only 2.3% and is effective at any wavelength, breaking the limitation that the absorption bands of currently used semiconductor compounds such as gallium arsenide are only at the visible and near infrared ends.

6. Large specific surface area

Graphene has a large specific surface area of 2630 ㎡/g, which can be used as a strong adsorbent and filtration material, applied in environmental protection, seawater desalination and other fields, and can also act as an energy storage material load.

The application of graphene​

Battery applications

Graphene in the battery can effectively reduce the internal resistance of the battery, improve the battery rate, charge and discharge performance and cycle life, and the bending of the battery has no effect on the charge and discharge performance.

Graphene functional coatings

Graphene's special two-dimensional lamellar structure has good chemical stability, and the misplacement in the middle layer of the coating can not only block the penetration of corrosive media to form a physical barrier.

Graphene electronics

Due to its attractive greenhouse dojo effect, it is suitable for development and in-depth research in the field of electronic engineering, which can enhance the timeliness of the main circuit switch, shorten the switching time, and speed up the response speed.

In the future, the application of graphene will continue to expand its energy, biomedical, environmental protection, aerospace and other fields will gradually be explored and used, continue to develop, and eventually enter thousands of households!