The healthy growth of the graphene industry will be "successful"

On July 6, the 2016-2017 China Graphene Development Annual Report released at the 2017 World Graphene Innovation Conference showed that since 2016, China's graphene enterprises have experienced explosive growth, and R&D enterprises accounted for about 43%. The application fields are mostly touch screen and other product parts, but the complete molding of breakthrough terminal products is rare, and the product type is not systematic. The report believes that China's graphene industry is still in the concept introduction period, which is the initial stage of industrialization breakthrough. It takes at least 5 to 10 years for the graphene industry to mature.
A few days ago, some media reported that physicists at Kansas State University may have found a way to produce graphene cheaply. It takes only three simple steps and three simple materials to produce graphene. Chris Sorensen, who invented this method, applied for and obtained a patent. This news has aroused the high attention and heated discussion of researchers in China.
What are the characteristics of graphene called "black gold"? What is the state of research and application of graphene in China?

Looking for new methods for graphene preparation in the face of environmental risks Scientists predict that graphene will "completely change the 21st century" and may set off a revolutionary new technology and new industrial revolution sweeping the globe. To this end, scientists who have been engaged in research in this field in the past 10 years have strived to break through the preparation technology of graphene as soon as possible, and hope to achieve mass production as soon as possible and seize the commanding heights of the international market.
Graphite is a layered structure, with van der Waals interaction between layers, the force is weak, and it is easy to peel off. In 2004, researchers at the University of Manchester in the United Kingdom repeatedly scraped graphite sheets with tape until a single layer of graphite, or graphene, was obtained. Tang Huang, an associate professor at Jiangsu Institute of Technology, said in an interview with the Science and Technology Daily on July 4: "This two-dimensional carbon material exhibits excellent physical and chemical properties and has become a research hotspot in the fields of materials science, physics, and chemistry."
Tang Huang introduced that there are many methods for preparing graphene. The research mainly includes micro-mechanical stripping method, chemical vapor deposition method, epitaxial growth method, redox method (Hummers method), etc. In addition to the Hummers method, the quality of graphene prepared by other methods is better. High is an indispensable method in graphene research. However, the inability to industrialize mass production can only be limited to scientific research in laboratories.
At present, the Hummers method is used more in the industry, but the graphene obtained by this method is not perfect, and there are many defects in the structure. At the same time, the method generates a large amount of chemical waste liquid, and there is a certain environmental risk. It is precisely because of the obvious defects in the preparation of graphene that no government of any country can support its industrialization. Therefore, in recent years, scientists from various countries have been concentrating on finding new methods for the preparation of graphene.
Sun Chunlong, senior engineer of the Marine Chemical Research Institute, told the Science and Technology Daily on July 6th: "The production of graphene by the explosion method similar to Chris Sorensen has been studied in China, but I have not heard of the successful mass production. ."

Although the market demand is large, graphene is difficult to mass-produce. Due to the structural characteristics of graphene, graphene has the characteristics of thin and hard, good transparency, strong thermal conductivity, high electrical conductivity, stable structure and fast electron migration speed. The application prospect is broad. In the past 10 years, the graphene concept has been widely sought after in the world. The domestic research and application and application of graphene is also “high in water” and continues unabated.
Despite the high market demand, graphene has always been difficult to mass produce. "The key is to solve some important technical problems." Tang Huang told reporters that at present, graphene still lacks uniform quality standards in the industry. Technology and standards have become a huge stumbling block to the industrialization of graphene. The industrialization of graphene still has a long way to go.
What is the difference between single layer and multiple layers? Tang Huang explained that graphene can be generally divided into single-layer graphene, double-layer graphene, small-layer graphene and multilayer graphene according to the number of layers. Among them, single-layer graphene is a graphene in a strict sense, and a small layer of graphene is composed of 3-10 layers. When the number of layers is greater than 10 layers, it is generally referred to as multilayer graphene. Because the excellent properties of graphene will decrease significantly with the increase of the number of layers, the industry believes that more than 10 layers do not have the excellent properties of graphene materials.
On July 6, Dai Jialong, the chief expert of China Carbon Valley Technology Group, who has been engaged in research and development for many years, said in an interview with the Science and Technology Daily reporter: "It should be said that in the international graphene preparation technology, China is at the level of international synchronization. In addition to the commonly used In addition to the redox method and the liquid phase stripping method, our carbon valley technology adopts the joint research of industry, academia and research, using high-quality large scale graphite as raw material, and micro-mechanical stripping method to produce a small layer of graphene. Its main advantage is the large diameter-to-thickness ratio and production. The process is non-polluting and retains the excellent mechanical and electrical properties of 2D materials."
In the words of Liu Zhongfan, academician of the Chinese Academy of Sciences and director of the Center for Nanoscience and Technology Research of Peking University, "Centre Valley's unique segmented micromechanical stripping process has created a new layer of constraints and bottlenecks in the current international graphene industry. The new development path has played a very good leading role in the large-scale application of the graphene industry."

Basic research is still in short supply, but it has been hot. Sun Chunlong told reporters that recently, regarding the industrial application of graphene, progress has been made in heavy-duty anti-corrosion coatings, graphene heat-dissipating films, and graphene-based batteries. But in fact, these applications are not too demanding on the quality of graphene. Although some products have been commercialized, the performance has not shown amazing results. Even in the field of new energy, the performance of some graphene conductive agents can not be compared with carbon nanotubes, which is related to the number of graphene layers, indicating that graphene technology is still immature, and graphene can only replace some traditional materials. .
In the words of Dai Jialong, the attention of graphene preparation technology is not as good as that of previous years. Many companies pay attention to the application of graphene. It is believed that the graphene preparation technology is mature, but the obtained graphene application product has the effect. Poor. As far as the domestic graphene status is concerned, the whole industry is still in the initial stage of development and has not entered industrialization.
The reporter learned that up to now, there is no single-layer graphene mass production in the world. Graphite resources are abundant in China, and the output accounts for about 70% of the world. However, some places confuse graphene with graphite resources. As long as the graphite resources are found locally, the concept of graphene is used, and the graphene industry relies on graphite resources planning. The garden is monotonous and homogenization is very serious.
In recent years, some domestic research institutes and production companies in the material field have invested a lot of money and blindly went straight to graphene, resulting in the concept of graphene research and graphene industry. The base and the new graphene material park are blooming everywhere. What worries the experts is that the key core technologies of graphene have not been solved. The true graphene products have not yet come out. Some R&D and production units have begun to lobby for development success. Now, it has begun to shift from “R&D fever” to “application heat”, and various kinds of application promotion conferences are overwhelming.

From concept to application, promote the healthy development of industrialization At present, the majority of domestic graphene enterprises are small and medium-sized enterprises, and the annual sales are mostly only about one million yuan, and lack of product development capabilities. Therefore, some production enterprises that claim to have an annual production capacity of 100 tons have far less than expected output value and profitability, and most enterprises are at a loss.
Zou Chuanquan, deputy general manager of Beijing Moen Technology Development Co., Ltd. said: "The current domestic graphene 'virtual fire' is too busy. If the key technologies are not solved, stay at a low level, within 5 to 8 years, there will be a large number of enterprises falling down."
Dai Jialong believes that in this boom of graphene, some places and enterprises have gone to the other extreme, drawing graphene as a "magic medicine" to stimulate economic development, to the point of irrational "fanaticism", serious Affect the healthy development of the graphene industry.
How to eliminate the "virtual fire" that is too prosperous? Experts have suggested that you should never look at the "one-of-a-kind bridge" of graphene. In fact, there are many products that can be developed using graphite resources. Local governments and enterprises should adapt to local conditions and develop multi-variety and high-value products around the market.
Sun Chunlong told reporters that China has a broad anti-corrosion coating market, in which the demand for marine heavy-duty anti-corrosion coatings is increasing. With the concentration of graphene-based heavy-duty anti-corrosion coatings put into research and development by many domestic research institutes and enterprises, it is not only important for the development of anti-corrosion coatings, but also a breakthrough for the industrialization of graphene, which will promote graphene. From concept to application development.

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