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

"How? What's new. ”

Chen Zhengping asked with some curiosity, he asked Xu Chuan to come over to help just with the idea of trying.

Needless to say, his disciple's mathematical ability to prove world-class conjectures must have surpassed most mathematics professors.

At least in the areas of functional analysis and elliptic operator spectral asymptotic, inverse spectral problems, and fractal drum theory, more than 90 percent of mathematics professors are surpassed.

But he didn't expect Xu Chuan to find out so soon.

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

On the contrary, modern materials science pays more attention to the study of various materials and the interpenetration and synthesis between them.

This requires the materials developer to be familiar with the properties 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 dielenide nanosheets, and then asked Xu Chuan to help analyze them, but he didn't expect that when he came in, there was a new discovery.

This disciple's mathematical vision is really so vicious?

......

After taking the calculation paper and experimental data from Fan Pengyue's hand, 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 and thought was a normal reaction, he looked at the calculation data on the manuscript paper.

With a yield rate of 48.32%, this value made him frown.

Can a small peak reduce the yield by 10 percentage points?

Isn't that too much of an impact.

And if calculated according to this yield rate, they have not made any progress in the preparation of tungsten diselenide nanosheets in the past two or three months, and it can even be said that they have regressed.

It's not scientific.

But the data in front of him was clearly there, and he fell into silence again.

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

"Well, it's this." Fan Pengyue nodded in confirmation.

Chen Zhengping thought for a while and said, "Well, find me two previous experimental data, the experimental data of chemical vapor deposition method and liquid phase stripping method." ”

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

After a while, two copies of the experimental data were printed.

Chen Zhengping took one and handed the other to Xu Chuan: "Help me check if there is a similar situation in this data in your hand." ”

Xu Chuan nodded, took the experimental data and flipped through it.

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

The so-called liquid phase stripping method is to disperse the raw materials that need to be stripped into a specific solvent or surfactant; The monolayer or multilayer raw material is then directly stripped from the surface by ultrasonic energy or other means to obtain a dispersion and monolayer of raw material that maintains the complete morphology and properties, and then can be deposited in a variety of environments and 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, and the principle is like this, yes.

However, it is interesting that Xu Chuan did not find the same anomalies in the experimental data of tungsten diselenide nanosheets exfoliated by liquid phase peeling method in his hands.

In other words, when the tungsten diselenide nanosheets were treated by the liquid-phase exfoliation method, there was no problem of material loss in the initial stage.

Judging from the data, the yield of tungsten diselenide nanosheets treated by liquid phase peeling can be as high as more than 60%, which aroused his interest.

"Interestingly, it seems that the reason for the low efficiency of the one-step synthesis of tungsten diselenide nanosheets by the solvothermal method does not seem to be entirely caused by the effect of van der Waals forces, and there must have been other factors that affected the one-step synthesis method of the solvothermal method in the early stage of the experiment."

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

"How's it going, 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 have looked at this data in my hand three times, and I didn't find any anomalies, I calculated the yield rate, which can reach more than sixty points." ”

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

"I don't know about that."

Xu Chuan put down the experimental data in his hand and added: "I just read the information 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, the reducing agent may have impurities? Or doesn't match something? ”

Xu Chuan added a very layman's sentence, which instantly aroused the rebuttal of the master Xiong Fan Pengyue.

"This is not possible, the reducing agent I use is hydrogen, which is the most suitable reducing agent for tungsten diselenide, which has the highest efficiency and filming."

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

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

Hearing this, Fan Pengyue smiled bitterly and said: "You don't understand, tungsten dielenide is different from natural minerals such as graphite and molybdenum disulfide, and it can only be prepared by artificial synthesis at present. ”

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

"Therefore, the current price of tungsten dielenide is quite expensive in China, and the solvothermal method is one of the best in our R&D experiments."

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

"This is also the focus of our research, if it can be successful, it can create a huge prospect of a vast market, the value of more than one billion every year, not to mention, the most important thing is to break the monopoly of foreign countries, so we can't give up so easily."

......