Great Country Academician

After a few minutes, Chen Zhengping, who had finally finished the experiment in hand, took off his white coat and plastic gloves and walked over.

"How is it? What's new?"

Chen Zhengping asked curiously. He asked Xu Chuan to come over to help, just thinking of trying.

Needless to say, the mathematical ability of his disciple, who can prove a world-class conjecture, must have surpassed most mathematics professors.

At least in the areas of functional analysis and spectral asymptotics of elliptic operators, inverse spectral problems and fractal drum theory, he surpassed more than 90% of mathematics professors.

But he never thought that Xu Chuan would find out so soon.

After all, mathematics and materials are two completely different fields. Although materials science requires some mathematics, it does not use very advanced mathematics.

On the contrary, the modern materials discipline pays more attention to the study of various materials and their interpenetration and comprehensiveness.

This requires material developers to be familiar with the characteristics of each material and how these materials will change during the experiment.

Originally, he was going to spend a day or two explaining the tungsten diselenide nanosheets, and then asked Xu Chuan to help analyze it, but he didn't expect to make a new discovery after he came in.

Is this disciple's vision in mathematics really so vicious?

After receiving the calculation manuscript paper and experimental data from Fan Pengyue, Chen Zhengping first looked at the energy spectrum peak section pointed out by Xu Chuan, and after confirming that this was indeed a mistake that they had ignored before and thought it was a normal reaction, he looked at the manuscript paper Calculated data on.

The yield rate of 48.32% made him frown.

Can a small peak section lower the yield by ten percentage points?

Is the impact too great?

And if calculated according to this yield rate, they have made no progress at all in the preparation of tungsten diselenide nanosheets in the past two or three months, and it can even be said to have regressed.

This unscientific.

But the data in front of him was so bright that he fell into silence again.

After thinking for a long time, Chen Zhengping looked up at Fan Pengyue and asked, "The method used for this set of experimental data is the one-step synthesis method of solvothermal method?"

"Well, it's this." Fan Pengyue nodded to confirm.

Chen Zhengping thought about it for a while, and said, "Well, give me two copies of the previous experimental data, the experimental data of chemical vapor deposition method and liquid phase peeling method."

"Okay." Fan Pengyue nodded, walked to the computer, called up the previous experimental data, and connected to the printer in the printer room of the laboratory.

After a while, two sets of experimental data were printed out.

Chen Zhengping took one copy, and handed the other to Xu Chuan: "Help me check, whether there are similar situations in the data in your hand."

Xu Chuan nodded, took the experimental data and began to read it.

What he has in hand is the experimental data of exfoliating tungsten diselenide nanosheets by liquid phase exfoliation.

The so-called liquid phase exfoliation method is to disperse the raw material to be exfoliated into a specific solvent or surfactant; then directly exfoliate the single-layer or multi-layer raw material from the surface by ultrasonic energy or other means to obtain a complete shape. Dispersions and single-layer raw materials with unique appearance and properties can then be deposited in a variety of environments and on different substrates.

To put it simply, tungsten diselenide is put into a special solvent, first disassembled into pieces, and then deposited into nanosheets.

The meaning is a bit rough, but the principle is true.

However, what is interesting is that Xu Chuan did not find the same abnormality as before in the experimental data of exfoliating tungsten diselenide nanosheets by the liquid phase exfoliation method in his hands.

That is to say, when the tungsten diselenide nanosheets are processed by the liquid phase exfoliation method, there is no problem of material loss in the initial stage.

Judging from the data, the yield of tungsten diselenide nanosheets processed by the liquid phase exfoliation method can be as high as 60%, which aroused his interest.

"Interesting, it seems that the reason why the one-step synthesis of tungsten diselenide nanosheets by the solvothermal method is so low does not seem to be caused by the van der Waals force. In the early stage of the experiment, there must be other factors that affected the one-step synthesis of the solvothermal method. Law."

Xu Chuan stared at the experimental data in his hand, rubbed his chin, and thought about it. The data of two different experimental methods told it some different answers.

"Well, did you find anything?"

On the side, after reading the experimental data in his hand, Chen Zhengping looked at Xu Chuan and asked.

Xu Chuan shook his head and said, "No, I read the data in my hand three times, but I didn't find any abnormalities. I calculated the yield rate and it can reach more than 60 points."

Chen Zhengping nodded, and rubbed his temples with some headaches: "I didn't find it here, so it seems that the abnormality in the last data should be related to the method or the experimental procedure?"

"I don't know about that."

Xu Chuan put down the experimental data in his hand, and added: "I just read the data, and noticed that the data in the solvothermal method seems to have added a reducing agent. Will the problem appear on the reducing agent?"

"For example, there may be impurities in the reducing agent? Or something that doesn't match?"

Xu Chuan added a very layman's sentence, which immediately aroused the rebuttal of the master Xiong Fanpengyue.

"It's impossible. The reducing agent I use is hydrogen, which is the most suitable reducing agent for tungsten diselenide, and it has the highest efficiency and film formation."

"As for impurities, the purification of hydrogen is not difficult. Using laboratory equipment, we can purify hydrogen to more than 99.99%, so impurities can basically be eliminated."

Xu Chuan shrugged and said, "Then I don't know about this, but the efficiency of this method for preparing tungsten diselenide nanosheets is indeed not high at present, maybe you can try another method?"

Hearing this, Fan Pengyue smiled wryly, and said, "You don't understand, the material of tungsten diselenide is different from natural minerals such as graphite and molybdenum disulfide. At present, it can only be prepared by artificial synthesis."

"Moreover, the soluble selenium salt used in the synthesis of tungsten diselenide is poisonous, and the green synthesis method is single, which is basically limited to the solid-phase synthesis of W-Se. The existing processes generally need to be carried out in a CVD tube furnace, which is very expensive. , and high-end equipment is monopolized by foreign countries, which is not conducive to large-scale industrial production in China.”

"So the current price of tungsten diselenide is quite expensive in China, and the solvothermal method is the best one in our research and development experiments."

"Because of its simple process, green raw materials, low cost, mild reaction conditions, and the obtained tungsten diselenide nanosheets have high crystal quality, uniform scale distribution and high specific surface area, the thickness of the nanosheets is below 10nm .”

"This is also the key direction of our research. If it succeeds, it will create a broad market with huge prospects. Not to mention billions of dollars every year, the most important thing is to break the monopoly of foreign countries, so we can't do it so easily. just give up."