Half an hour later, Cheng Haoqian entered Yang Lin's office with a man in his thirties wearing glasses.

Seeing Yang Lin, the man with glasses seemed to be a little nervous, and he didn't know where to put his hands.

Yang Lin smiled and stepped forward and said, "Lao Cheng, you're here!" This is Dr. Keqiao, Dr. Ke, hello! ”

"Mr. Yang, hello!"

Ke Qiao looked a little excited, he didn't expect that the planning plan of the Graphene Research Institute he submitted would be seen by Yang Lin so soon.

Although he is much younger than himself, the other party has already achieved achievements that ordinary people cannot achieve in a lifetime, and Ke Qiao was a little excited to be received by Yang Lin.

Of course, this is also due to the fact that Yang Lin is used to seeing big people, and his body is more or less contaminated with some aura.

The two shook hands with a smile, and Yang Lin said, "Come, let's talk on the sofa." ”

Birch came in with three cups of coffee at the right time.

The three of them sat down on the sofa in the reception area, and Yang Lin smiled: "Dr. Ke, I read your report before, and I am also clear about the prospects of graphene materials, but you said that the establishment of a graphene research institute, can you tell me your specific ideas?" ”

Seeing Yang Lin asking professional questions, Ke Qiao's expression also became solemn, and said, "Mr. Yang, I followed my supervisor, Professor Kriner, to study graphene during my doctoral stage. As the thinnest, hardest, most conductive nanomaterial at room temperature and with strong flexibility, graphene materials have great application potential in wearable smart devices, smart sensing devices and other fields, and the power storage capacity of graphene polymeric material batteries is also three times that of the best products on the market. Electric vehicles powered by this battery can travel up to 1,000 kilometers and charge in less than 8 minutes. ”

Yang Lin nodded. Motioned to Keqiao to continue.

Ke Qiao said: "This time to join the matrix digital, on the one hand, is to take a fancy to the development prospects of the matrix digital. On the other hand, it is hoped that Matrix Digital can strengthen its research investment in graphene. At present, there have been many large companies at home and abroad to carry out in-depth research on graphene, I think as the leader of China's current consumer electronics industry, matrix digital should pay more attention to this aspect of basic research, so I hope that our company can set up a corresponding institution to do this exploration. ”

Yang Lin smiled: "Do you have any suggestions for the research direction of graphene?" I have read relevant information, and the current preparation cost of graphene should be very high, it is said that it has reached more than 5,000 yuan per gram, and it is called black gold. And in 2004, Novoselov used the mechanical stripping method used to prepare graphene for the first time (for which they won the Nobel Prize in Physics in 2010), and they actually peeled it off with tape on graphite. This approach is a joke for large-scale industrial production. I wonder what else is being done in the materials science community on this? ”

Ke Qiao was slightly stunned, he didn't expect Yang Lin to do a lot of homework, and the questions he asked were quite professional.

He thought for a moment and said, "Of course, now we have many other ways to increase production and reduce costs, and the trouble is that the quality of the products of these methods cannot be guaranteed." ”

"For example, the liquid phase exfoliation method: graphite or similar carbonaceous materials are put into a liquid with a very high surface tension, and then the graphene snowflakes are blown off by ultrasonic bombing. There is also the chemical vapor deposition method: the carbon-containing gas is condensed on the surface of the copper to form a thin layer of graphene and then peel off. We also have the direct growth method, which manages to grow a layer of graphene directly between two layers of silicon. There is also chemical redox method. The graphite sheets are separated by the insertion of oxygen atoms, and so on. There are many methods, and each has its own scope of application, but so far there is no technology that is really suitable for large-scale industrial production. ”

Yang Lin was slightly stunned. Puzzled: "Why can't these methods make high-quality graphene?" ”

Ke Qiao said: "That's it, Mr. Yang, I'll give you an example." Although the central part of a piece of graphene is the perfect six-membered ring. But the marginal parts tend to be disrupted and become five- or seven-membered rings. It doesn't seem like a big deal. But the patch of graphene produced by chemical vapor deposition is not really a complete piece that grows from a single point. It is actually polycrystalline produced by the simultaneous growth of multiple points, and there is no way to guarantee that the small pieces grown from these multiple points will be completely aligned. Thereupon. These rings of deformity are not only distributed at the edges, but also exist inside each piece of graphene that comes out in this way, becoming structural weaknesses and prone to breakage. To make matters worse, this fracture point of graphene does not heal itself like polycrystalline metals, but is likely to continue to extend. The result is that the strength of the entire graphene is halved. Materials are a troublesome area, and it's not impossible to have both, but it's certainly not that fast. Therefore, if the company really wants to develop in the field of graphene, it must invest heavily in research. ”

Yang Lin nodded and said, "Another question is about graphene applications. A promising direction for graphene is display devices, touch screens, e-paper and so on. However, at present, the contact resistance of graphene and metal electrodes is difficult to deal with, and this is probably a big problem. ”

Yang Lin's problem is also targeted, modern electronic products are all built on semiconductor transistors, and it has a key property called the band gap: the interval between the conductive and non-conductive bands of electrons. Because of this interval, the flow of current can be asymmetrical, and the circuit can have two states: on and off.

But here's the problem, the conductivity of graphene is so good that it doesn't have this band gap, so it can only be turned on and not off.

What's the use of a circuit that only has wires and no logic?

Ke Qiao said: "Mr. Yang is right, this is indeed the most lethal problem of graphene in the field of electronic products. Therefore, if you want to create future electronic products with graphene and replace silicon-based transistors, you must artificially implant a band gap, and we have a lot of research in this field at present: multilayer composite materials, adding other elements, changing the structure, etc., but if you want to really put it into application, you must have at least three to five years of research to be possible. So from a certain point of view, graphene research is a long-term investment, which cannot be immediately converted into profits, but it can allow us to occupy the commanding heights in the future electronics market! Of course, if Matrix Digital gives up research in the field of graphene, I think I will submit my resignation to the company and join the Institute of Materials of the Chinese Academy of Sciences to do some research in basic fields. ”

When he said the last sentence, Ke Qiao looked at Yang Lin without blinking, as if he was showing his identification belief to the other party. (To be continued......)