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

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

Yang Lin smiled and stepped forward and said, "Old Cheng, you are here! This is Dr. Ke Qiao, hello Dr. Ke!"

"Hello, Mr. Yang!"

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

Although he is much younger than himself, the other party has achieved achievements that ordinary people will never achieve in their lifetime. Ke Qiao seemed a little excited to be able to get Yang Lin's reception.

Of course, this is also because Yang Lin is used to seeing big people and is more or less infected with certain auras.

The two of them shook hands with a smile, and Yang Lin said: Talking on the sofa."

Bai Hua brought in three cups of coffee at the right time.

The three of them sat down on the sofa in the reception area. Yang Lin smiled and said, "Dr. Ke, I read your report before. I also know the prospects of graphene materials. But if you say that you have established a graphene research institute, can you tell me your specific ideas?"

Seeing Yang Lin asking about professional questions, Ke Qiao's expression became solemn, saying: "Mr. Yang, I followed my supervisor, Professor Krina to study graphene. I believe you should also understand that graphene is a new material with a single-layer sheet structure composed of carbon atoms. As the thinnest, hardest, most conductive at room temperature, and strong flexibility, graphene materials have great potential in the fields of wearable smart devices, smart sensing devices, etc., and the power storage capacity of graphene polymeric material batteries is three times that of the best products on the market. Electric vehicles that provide electricity with this battery can travel up to 1,000 kilometers, and their charging time is less than 8 minutes."

Yang Lin nodded and signaled Ke Qiao to continue.

Ke Qiao said: "This time I joined Matrix Digital, on the one hand, I am attracted by the development prospects of Matrix Digital, and on the other hand, I hope that Matrix Digital can strengthen its research investment in graphene. At present, many large companies in China have conducted in-depth research on graphene. I think as the leader of my country's current consumer electronics industry, Matrix Digital should pay more attention to basic research in this area. So I hope our company can set up corresponding institutions to do this area of ​​exploration."

Yang Lin smiled and said, "Do you have any suggestions on the research direction of graphene? I have read relevant information. The current cost of graphene preparation should be very high. It is said that it reaches more than 5,000 yuan per gram. It is called black gold. Moreover, in 2004, Novosholov and others used the mechanical peeling method to prepare graphene for the first time (and won the Nobel Prize in Physics in 2010). They actually used tape to peel it off. This method is simply a joke for large-scale industrial production. I want to know what research there is in the materials science community in this area at present?"

Ke Qiao was slightly stunned. Unexpectedly, Yang Lin had done 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. The trouble is that the product quality of these methods cannot be guaranteed."

"For example, liquid phase peeling method: put graphite or similar carbon-containing materials into liquid with extremely high surface tension, and then ultrasonic bombardment blows the graphene snowflakes down. There is also a chemical vapor deposition method: let carbon-containing gas condense on the copper surface, and the thin layer of graphene formed is peeled off. We also have a direct growth method, and we can directly grow a layer of graphene in the middle of two layers of silicon. There are also chemical redox methods, which separates the graphite sheets by inserting 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 can really be suitable for large-scale industrial production promotion."

Yang Lin was slightly stunned and asked in confusion: "Why can't these methods make high-quality graphene?"

Ke Qiao said: "That's it, Mr. Yang, let me give an example. Although the central part of a piece of graphene is a perfect six-membered ring, the edge part is often disrupted and becomes a five-membered or seven-membered ring. This seems no big deal, but a piece of graphene produced by chemical vapor deposition is not really complete, and a piece of graphene grown from a point. It is actually a polycrystalline produced by multiple points at the same time, and there is no way to ensure that the small pieces grown from multiple points can be fully aligned. Therefore, these deformed rings are not only

Distributed on the edge, it still exists inside every piece of graphene made in this way, becoming a structural weakness and easily breaking. What's worse is that this breaking point of graphene does not heal itself like polycrystalline metals, but it is likely to extend all the time. The result is that the strength of the entire graphene needs to be reduced by half. Materials are a troublesome area, and it is not impossible to have both fish and bear's paws, but it is definitely not that fast. So if the company really wants to develop in the graphene field, it will definitely invest huge amounts of money in research."

Yang Lin nodded and said, "The other question is about graphene application. A promising direction of graphene is display devices, touch screens, electronic paper, etc. But at present, the contact point resistance between graphene and metal electrodes is difficult to deal with, which 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 attribute called bandgap: the interval between the electronic conductive energy band and the non-conductive energy band. It is precisely because of this interval that the flow of current can be asymmetric and the circuit can have two states: on and off.

But the problem is that graphene has too good conductivity. It does not have this band gap and can only be turned on but not turned off.

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

Ke Qiao said: "Mr. Yang is right. This is indeed the most fatal problem in the electronic product field. So if you want to create future electronic products and replace silicon-based transistors, you must manually implant a band gap. At present, we have indeed done a lot of research in this field: multi-layer composite materials, adding other elements, changing structures, etc., but if you want to truly put them into application, you must have at least three to five years of research before it can be achieved. So from a certain perspective, graphene research is a long-term investment and cannot be converted into profit immediately, but it can allow us to occupy the commanding heights in the future electronic market! Of course, if matrix digital abandons research in the graphene field, I think I will submit my resignation to the company and then join the Institute of Materials of the Chinese Academy of Sciences to do some basic research."

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