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Mass production of graphene is not difficult. How to apply it is a problem.

Mass production of graphene is not difficult. How to apply it is a problem.

Classification:
Industry news
Author:
Source:
2014/01/03 09:15
[Abstract]:
Beijing time on January 02 news, China touch screen network news, mobile phone touch screen can be as big as a tablet computer, when it is not folded, put it in the trouser pocket - with the emergence of new graphene materials, such a mobile phone is about to appear in life.
Beijing time on January 02 news, China touch screen network news, mobile phone touch screen can be as big as a tablet computer, when it is not folded, put it in the trouser pocket - with the emergence of new graphene materials, such a mobile phone is about to appear in life.
Dr. Shi Haofei, chief scientist of Chongqing Moxi Technology Co., Ltd., said that graphene is the thinnest and hardest nano material in the world, and its conductivity is also the best among known materials. Compared with the ITO materials commonly used in existing mobile phone touch screens, graphene films have the advantages of better light transmittance, higher definition of screen display, and more sensitive touch positioning. It saves electricity and saves more than 10% of electricity compared to existing screens.
The data show that graphene has excellent physical properties: First, the world's strongest material, used to make a film (about 100 nanometers) thicker than ordinary food plastic bags, can withstand a pressure of about 2 tons It can be used to manufacture ultra-light body armor, ultra-thin and ultra-light aircraft. Second, the most conductive materials, will completely replace silicon materials in touch screens, displays, chips and so on. Third, with high-speed charge and discharge performance, the charging time can be shortened from the past few hours to less than 1 minute, is expected to completely replace the current mobile phone, computer battery, and even pure electric car battery, driving a revolution in storage power. At present, China's graphene industry is in the stage of mass production.
It is reported that the mass production of graphene is not difficult, and how to apply is the real problem facing this industry.
"As far as graphene is concerned, domestic progress has been relatively fast in recent years, including the establishment of the graphene industry alliance, which has a relatively strong support for the development of the domestic graphene industry. However, the application of graphene still faces many problems, and it will take a long time in the future. It will still be in the exploratory stage," said Shen Wanci, a retired professor at Tsinghua University. At the same time, Gao Chao, a professor of polymer science at Zhejiang University, said that the successive production of large-scale production lines shows that there is basically no problem in mass production, and it is not a bottleneck problem. The key is the latter application.
In the domestic graphene industry, Professor Shen Wanci and Gao Chao are quite influential. The former is an industry-recognized carbon material expert and the chairman of the China Non-Metallic Mining Industry Graphite Association Expert Committee. The superb research result "carbon sponge" breaks the world record of the lightest solid materials. At the beginning of this year, once the "carbon sponge" was launched, the concept of graphene stock in the A-share market was like a stimulant, and it has risen.
At present, graphene is roughly divided into two processes, one is chemical vapor deposition (CVD) and the other is stripping. Generally speaking, graphene is a single-layer graphene sheet, which refers to a graphene sheet which is relatively complete in structure by CVD, and graphene produced by a stripping method has a single layer, but more is a multilayer. . Therefore, the graphene produced by the stripping method is also called "microchip graphene" and "small sheet graphene".
In the eyes of two experts, mass production of graphene is not difficult. According to reports, before the British scientists discovered graphene in 2004, the stencil film can be regarded as a "simple version" of graphene, find a gap along the stencil film, then add polymer sulfuric acid, heat sulfuric acid will vaporize, sulfuric acid When the volume becomes large, it expands, and the expanded microchip can also be regarded as a multilayer graphene.
"Now the domestic stripping method is actually more isolated. At present, natural graphite is not expensive, physical separation, crushing is not lacking equipment, or it can be modified according to the existing equipment on the market." In Shen Wanci's view, micro The graphene production process is a very simple matter.
Graphene has a wide range of prospects, and it can be used for nano-scale integrated circuits, high-strength materials, and the like. To allow graphene to exert its strength, it needs to have a certain scale. Therefore, large graphene is the future direction of the graphene industry and a difficult point in the graphene industry.
Shen Wanci said that the graphene made by the stripping method is a small microchip. It should be assembled into large pieces and assembled in the laboratory, but this is more difficult. It's like making a lot of small pieces of cloth into large sheets, which is very difficult. At present, the use of graphene by the stripping method is very small, except that the microchips are made into large pieces without leaving any traces, but each piece of micrographene is structurally different, how to find the joints. And how to smooth the connection, this is more difficult.
If large-scale single-layer graphene is a difficult problem to be solved in the industry, then after breaking through this difficulty, it still needs to face market test.
"Graphene can replace silicon, it can also be applied to touch screens, car batteries, but this is only a theory, and actually has to do a lot of work." For the application of graphene, superb is not optimistic to point out that even graphene material production Out of high performance products, but at least there are risks, even if the risk of 5%, will affect downstream demand.
At the beginning of this year, Professor Gao Chao conducted the application of graphene materials, which developed a “carbon sponge” based on two nanomaterials, graphene and carbon nanotubes. This product is called one of the most oil-absorbing materials. For the marketization of this product, Gao Chao said that it is planned to realize industrial application in 5 to 10 years, and it is not even ruled out that it is only an academic breakthrough.
Shen Wanci said that to replace the original materials, it depends on the price. The large cost of graphene produced by CVD method is still relatively high. It takes time to form a market. The microchip graphene has low production cost and low threshold. Now there are some market applications, and it is still in trial use. At the stage, for example, there is a certain demand for conducting positive and negative active material conductors, but it is not clear how much this demand is. Other promising applications, such as composite materials, polymer materials, etc., have not yet produced real products, nor have they formed a real market.
(This article comes from: China Touch Screen Network (http://www.51touch.com/) Detailed Source Reference: http://www.51touch.com/material/news/dynamic/2014/0102/27283.html)