It is a typical low-dimensional transition metal chalcogenide semiconductor material, an inorganic compound with a layered structure, and has 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. It can also be used to make transistors, photoelectrodes, single-photon emitters and other things.
At present, it is still a cutting-edge research object in the materials field, but it will become very popular in the next ten years and 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 studying this field in his previous life. It seems that the research must have failed.
Otherwise, it would be impossible for no message to be conveyed.
After all, most people would talk about their past failures when they are idle, isn't it just to show off what achievements they have made?
Moreover, it is very common to fail when developing a new material. Funding is broken, problems that cannot be solved are encountered, the mentor runs away, and the R&D team is poached. Everything is normal.
"Of course, I will assist you throughout the process. I will tell you the meaning of each experimental data and the corresponding experimental steps. This may make it faster."
If nothing unexpected happens, the reason why there are problems with the tiling of tungsten diselenide should be due to the eutectic effect of tungsten diselenide.
Tungsten diselenide is a typical sulfide low-dimensional material. Although he has not studied it, he has studied many similar materials in his previous life.
For example, Zhejiang University has taken money from Nanjing University, and even P University and Shuimu over the years to steal many professors and laboratory personnel, and even to the extent of recruiting researchers from the other party's entire project.
Generally speaking, there are many methods for preparing two-dimensional nanosheet materials, such as mechanical exfoliation, liquid phase exfoliation, electrochemical exfoliation, chemical vapor deposition, hydrothermal methods, etc.
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 forces.
"Zero-dimensional materials are also called quantum dots. They are composed of a small number of atoms or molecules stacked up. The size of the particles is on the nanometer scale. For example, atomic clusters of semiconductors and metals are typical zero-dimensional materials."
After all, to solve material mathematics problems, it's impossible even if you don't know the material at all.
Because tungsten diselenide is an inorganic compound with a layered structure and has a hexagonal structure similar to molybdenum disulfide, each tungsten atom is bonded to six selenium atoms in a triangular prism coordination manner, and each selenium atom is
It has a pyramidal configuration and three tungsten bonds.
Fan Pengyue briefly introduced the current project situation and progress, and also briefly explained the material knowledge.
It is precisely because of this that Zheda's influence has been steadily increasing over the years.
"We need your help to analyze the data to see what hinders the complete crystallization of tungsten diselenide during the tiling process. This part is about functional analysis. I have studied it with Professor Zhou Hai before.
For a while, but obviously, you know, I had almost no talent for math."
"Then what do you need me to do?" Xu Chuan asked in confusion.
Nanomaterials were the focus of his research in his previous life.
"One-dimensional materials are called quantum wires. The thickness of the wires is on the order of nanometers, such as carbon nanotubes and one-dimensional graphene. These are one-dimensional materials."
"This time we are studying tungsten diselenide, which is a two-dimensional material."
"Well, these concepts shouldn't be difficult for you, but for now you just need to understand them, there's no need to go in depth."
"Teacher, Xu Chuan is here."
"So this is all up to you."
"Currently, our main task is how to tile tungsten diselenide in a single-atom structure on a silicon oxide silicon wafer or an optical sapphire wafer, so that it can form a nanometer-scale single-layer structure."
After all, there are countless universities, materials research institutes, materials laboratories, and materials companies in China. Even though the field of materials is very broad, only those are valuable and popular.
"Two-dimensional materials include the interface of 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 nanometer scale, such as metal nanoplates."
More importantly, the materials industry is really in a hurry and the winner takes all.
"But in every tiling experiment, tungsten diselenide will eventually appear."
"Teacher." Xu Chuan also greeted him.
"Then come with me, junior brother." Fan Pengyue smiled honestly and took Xu Chuan to visit the materials laboratory. While visiting, he explained:
"As we just mentioned, the material we are studying in this project is tungsten diselenide, which is a low-dimensional material."
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 involved in the materials industry for many years, they can definitely see it. After all, everyone is also a veteran.
.
After listening to Fan Pengyue's explanation, he already roughly knew where the problem lay.
If you can make the materials one month in advance, or even half a month in advance, and successfully pass the patent release, then the latecomers will really lose their pants and not even be able to take a sip of soup.
After bringing the person over, Fan Pengyue called out to Chen Zhengping who was busy.
This is probably the main reason why this project has always been stuck.
"Oh, I forgot to explain what low-dimensional materials are. The so-called low-dimensional materials are materials that do not exceed the nanometer level in three dimensions. Specifically, they are two-dimensional, one-dimensional and zero-dimensional materials."
"Well, okay, Xu Chuan, please wait a moment while I finish the experiment in hand. Fan Pengyue, please take Xu Chuan to understand our project first."
Therefore, the competition between each other is really not small, and everyone is rushing to compete for time, or simply throw money at others.
Except for the mechanical stripping method, most of these methods are suitable for tungsten diselenide.
Chen Zhengping replied without even raising his head, staring at the experimental equipment in front of him.
However, due to the existence of van der Waals forces, the peeled off tungsten diselenide nanosheets are not stable and are easily stacked together again through van der Waals forces.
Fan Pengyue sighed. Neither he nor his tutor were good at functional analysis. Although his tutor knew a little more than him, he was still in a mess about these mathematics and could not find any ideas.
But this is normal, not everyone is as perverted as the little junior brother in front of me.
In fact, most undergraduate physics departments in universities do not offer functional analysis courses at all. Even if you choose a minor, you can only go to the School of Mathematics to audit it.
Therefore, physicists in the physics world are generally not good at mathematics, except for Witten and the pervert in front of me.