Great Country Academician

"Tungsten diselenide?"

Xu Chuan muttered for a while, he knew the name.

It is a typical low-dimensional transition metal chalcogenide semiconductor material, a layered inorganic compound with good physical, chemical and electrical properties.

Widely used in energy storage batteries, lubrication, semiconductors, photovoltaics, aerospace, aviation, military, national defense and other fields.

For example, it can be used as a cathode material for lithium-sulfur batteries, or anode materials for lithium batteries, and can also be used to make transistors, photoelectrodes, single-photon emitters, and other things.

At present, it is still a research object at the forefront of the materials industry, but it will be very popular in the next ten years, and it will be common in almost every university.

It seems that his mentor's vision is indeed very good, but he seems to have never heard of his mentor's research in this area in his previous life, and it seems that the research must have failed.

Otherwise, it is impossible for no news to be delivered.

After all, ordinary people would talk about their failures in the past, wouldn't they just show off what achievements they had made?

Moreover, it is also very common to fail when developing a new material. It is normal for funds to break, encounter unsolvable problems, mentors to run away, and R\u0026D teams to be poached.

After all, there are so many domestic universities, material research institutes, material laboratories, and material companies. Even if the material field is very extensive, those are the most valuable and popular ones.

Just like Chen Zhengping can see that low-dimensional materials transition metal chalcogenide materials are a hot prospect in the future, not to mention other people who have been in the material industry all the year round, they must be able to see it, after all, everyone is old-fashioned. .

So the competition between each other is really not small, and everyone is scrambling for time, or just throwing money at others.

For example, Zhe University has taken money from Nantah University, P University and Mizuki over the years to smash many professors and laboratory personnel, and even the researchers of the other party's entire project.

It is also true that Zheda's influence has been increasing over the years.

More importantly, the material industry is really in a hurry and the winner takes all.

If you can make the materials a month or even half a month in advance, and successfully pass the patent issuance, then the latecomers will really lose all their pants and drink their soup.

"Mentor, Xu Chuan is here."

After bringing him over, Fan Pengyue called out to Chen Zhengping who was busy.

"Teacher." Xu Chuan also greeted him.

"Well, okay, Xu Chuan, wait a moment, I've finished the experiment in my hand, Fan Pengyue, let's take Xu Chuan to learn about our project first."

Without raising his head, Chen Zhengping stared at the experimental equipment in front of him and replied.

"Then come with me, Junior Brother." Fan Pengyue smiled honestly, took Xu Chuan to visit the material laboratory, and explained while visiting:

"The material we are working on in this project has just been mentioned, it is tungsten diselenide, which is a low-dimensional material."

"Oh, I forgot to explain what low-dimensional materials are. The so-called low-dimensional materials are materials that do not exceed nanoscale in three dimensions, specifically two-dimensional, one-dimensional and zero-dimensional materials."

"Zero-dimensional materials are also called quantum dots. They are composed of a small number of atoms or molecules stacked up, and the size of the particles is on the order of nanometers. For example, atomic clusters of semiconductors and metals are typical zero-dimensional materials."

"One-dimensional materials are called quantum wires, and the thickness of the wires is on the order of nanometers. For example, carbon nanotubes and one-dimensional graphene are one-dimensional materials."

"The two-dimensional material is an interface including two materials, or a thin film attached to a substrate. The depth of the interface or the thickness of the film layer is on the order of nanometers, such as metal nanoplates."

"Our research on tungsten diselenide this time is a two-dimensional material."

"Well, these concepts shouldn't be difficult for you, but you just need to understand them for now, and you don't need to go deep."

"At present, our main problem is how to spread tungsten diselenide on a silicon oxide wafer or an optical sapphire wafer in a single-atom structure, so that it can form a nanoscale single-layer structure."

"But every time you do a tiling experiment, eventually tungsten diselenide will show up."

Fan Pengyue briefly introduced the current situation and progress of the project, and also briefly explained the knowledge of materials.

After all, to solve the problem of material mathematics, it is impossible to completely understand the material.

"Then what do I need to do?" Xu Chuan asked in 'doubt'.

After listening to Fan Pengyue's explanation, he already roughly knew where the problem was.

Tungsten diselenide is a typical sulfurized low-dimensional material. Although he has not studied it, he has studied many similar materials in his previous life.

Nanomaterials were the focus of his research in his previous life.

If it is not surprising, the reason why there is a problem with the tiling of tungsten diselenide should be due to the eutectic effect of tungsten diselenide.

Because tungsten diselenide is a layered inorganic compound with a hexagonal structure similar to molybdenum disulfide, each tungsten atom will bond with six selenium atoms in a prism coordination mode, and each selenium atom will It is in a pyramidal configuration with three tungsten bonds.

The bond length between tungsten and selenium is 2.526, the bond length between selenium and selenium is 3.34, and the layers are combined by van der Waals force.

Generally speaking, there are many methods for preparing two-dimensional nanosheet materials, such as mechanical exfoliation, liquid phase exfoliation, electrochemical exfoliation, chemical vapor deposition, and hydrothermal methods.

Except for the mechanical stripping method, most of these methods are suitable for tungsten diselenide.

However, due to the existence of van der Waals force, the exfoliated tungsten diselenide nanosheets are not stable, and they are easy to stack together again through van der Waals force.

This is probably the main reason why this project has always been stuck.

"We need your help to analyze the data and find out what hinders its complete crystallization during the tiling process of tungsten diselenide. This piece is about functional analysis. I have learned from Professor Zhou Hai before." For a while, but obviously, you know, I hardly have any mathematical talent."

"So this is up to you."

"Of course, I will assist you in the whole process. I will tell you the meaning of each experimental data and the corresponding experimental steps, so that it may be faster."

Fan Pengyue sighed. Neither he nor his tutor was good at functional analysis. Although his tutor knew a little more than him, he was confused about these mathematics and couldn't find his thoughts.

But this is normal, not everyone is as perverted as this little junior in front of him.

In fact, the physics department at the undergraduate level of general universities does not offer the course of functional analysis at all. Even if you choose to minor, you can only go to the mathematics department to audit it.

Therefore, physicists in the physics world are generally not good at mathematics, except for Wei Teng and the pervert in front of him.