Characteristics Of Graphene And Its Application

First, graphene material profile

Now the world is not a clear definition of graphene. 2004 British University of Manchester scientists Andrei Heim and Constantine Norfolkov found monolayer graphene (graphene). They were awarded the 2010 Nobel Prize in Physics for their excellent research work on graphene materials. Therefore, the initial graphene only refers to a single layer of carbon atoms from the single structure of the new material, is only one carbon atom thickness of the two-dimensional material. However, follow-up studies show that, from the electrical nature of the two and three, and even ten layers of carbon atoms also have their own special physical properties, the current thickness of 10 layers of carbon atoms within the sheet of graphite material is defined as graphene The argument is gradually recognized by academics. The recently established China Metalsene Union Standardization Committee found that the thickness of 10 layers of carbon atoms in the material belongs to the graphene range.

Graphene is a magical material, as long as the addition of a little into other materials may have a magical effect, worthy of the material sector "super material." Graphene not only "thinnest, strongest", as a thermal conductor, it is better than any other material's thermal effect. Using graphene, scientists can develop a range of new materials with special properties. Because of its very low resistivity, electron migration is extremely fast, it is expected to be used to develop thinner, faster conductive chips, replacing silicon. Since graphene is essentially a transparent, good conductor, it is also suitable for making transparent touch screens, light plates, and even solar cells. Super capacitors and chips, is the world's focus on the study of graphene field, but also the future of the culmination of the revolutionary progress of graphene. The application of graphene must be a process that extends from the low end to the high end. The use of low-end applications of conductivity of graphene will rise in the past two to three years, and the use of photovoltaic cells and replace the silicon chip chip area, still takes a long time. "

Second, made of graphene

The practical products of graphene are divided into two categories: graphene film and graphene powder. There are many ways to prepare graphene in the laboratory (see figure below). However, the way of mass production of graphene is mainly two kinds: one is the use of chemical vapor deposition in the metal surface to grow a single layer rate is very high, large area of graphene film material; one is the natural graphite through physical or chemical The method of crushing, the formation of graphene powder. The graphene powder looks like a very fine black powder. Domestic graphene powder and graphene film has been equipped with mass production capacity, is expected to a series of industrial applications of graphene will be large-scale roll out. As a high-tech material, graphene powder production process, research and development, technology and equipment are very important, the production of labor costs are very small. The annual production capacity of 50 tons of graphene powder business, the production process only a few workers only.

Third, the application of graphene

1, the application of graphene film

Mobile phone touch screen to start the first shot of graphene film application. Graphene film in the bright spot in 2014 is in the touch screen area, 2015 in the flexible display, can wear electronic will be a breakthrough. According to statistics, mobile device touch screen production in 2015 may reach 36 million square meters. This also shows the market space of graphene ITO film to a certain extent. 2016 domestic and foreign enterprises may be in the flexible solar cell breakthrough, 2017 may be large-scale application in the field of science and technology. "It is understood that graphene film materials have been in the medical field has also made a breakthrough, get a better evaluation.

2, the application of graphene powder

The so-called "graphene powder", in fact, is a single layer of graphene and multi-layer graphene mixture powder. Its application is also very extensive.

A, the graphene powder added to the cable, will greatly improve the performance of the conductive material, cable profit margins will also be improved, the market prospect is very large.

B, graphene powder instead of zinc oxide anticorrosive coating, a graphene can replace 50 parts of zinc oxide, which means that if the future with graphene instead of zinc oxide, anti-corrosion coating per ton can reduce the cost of 1000 to 2,000 yuan; some Plastic material, because the addition of graphene and have a thermal function.

C, in the lithium-ion battery industry, lithium iron phosphate as a power lithium-ion battery is one of the most concerned about the cathode material, there has been a weak conductivity problem. It is possible to improve the electrical conductivity of lithium iron phosphate to a certain extent by using an ordinary graphite powder, but it does not reach an ideal state. If the use of graphene powder on the surface of lithium iron phosphate modified, can greatly improve the conductivity of lithium iron phosphate, significantly reduce the battery resistance, thereby enhancing the battery's high current capacity.

The application is only part of the field of graphene applications, its application prospects are very broad, which is recognized by the scientific community at home and abroad. Therefore, the development of active graphene production and application research is a strategic topic of material science, worthy of our attention.