Just when Shen Jing was sighing in his heart, Chen Zhou came back.

There was also a tall, thin boy with glasses.

"Senior, let me introduce you. Chen Zhou pointed to the boy next to him and introduced, "This is my high school tablemate Zhang Yifan, from the Department of Chemistry of Huaguo University of Science and Technology, who was called by me to help." ”

After speaking, Chen Zhou pointed at Shen Jing again: "This is Senior Shen Jing who came to Luzhou with me to participate in the project this time, and like me, he is from the Department of Mathematics of Yan University." ”

"Hello. Zhang Yifan and Shen Jing greeted each other.

"Yifan, you come here. Chen Zhou moved the chair and put it on the table, and then said, "The literature you downloaded in the afternoon, remove the first 47 articles, and the specific process data in the back literature, I rely on you to help me sort it out." ”

"No problem. Zhang Yifan nodded, but then thought that something was wrong, if the 47 articles were removed, there was still ...... left

？？？

Chen Zhou looked at Zhang Yifan with a smile and said, "I believe you can!"

Zhang Yifan: "......"

Shen Jing looked at Zhang Yifan, then leaned over to Chen Zhou's side and asked softly, "When will you ask him to help you download the literature?"

Chen Zhou said: "Before I went to Dr. Wu's office, I called him and asked him to help him find the literature. After all, some literature can only be downloaded in the school library. ”

Shen Jing was stunned, and then glanced at Chen Zhou deeply.

Hearing the words of the two, Zhang Yifan said with a smile: "I thought that Chen Zhou suddenly called me for something, but it turned out that I was asked to help check the literature." I'll just say that you came to Luzhou this time, why didn't you say hello in advance?"

Chen Zhou smiled and said, "Didn't I just arrive? Isn't it interesting enough to look for you just now?"

Zhang Yifan was noncommittal, he estimated that if it weren't for the fact that he wanted to check the literature, Chen Zhou would most likely call before leaving.

But he also understands that this is not a holiday, there is a mission.

And looking at this posture, it should be a task with a relatively tight time.

So after receiving the call, Zhang Yifan didn't say a word, and spent an afternoon helping Chen Zhou check the literature.

It's just that he is very puzzled that Chen Zhou actually wants so many documents......

Is there more of this thing?

"I heard that you are going abroad to give an academic report?" Zhang Yifan thought of the news he saw on the Internet, so he asked Chen Zhou.

Chen Zhou sat back at the table, flipped through the literature, and said, "Well, on the 15th of next month, I will make a report on the proof of the hail conjecture." ”

"Yes, I thought the news on the Internet was not credible, but I didn't expect it to be true!" Zhang Yifan was very happy for Chen Zhou.

Chen Zhou smiled and urged: "You hurry up and work, and I will invite you to a big meal when I go back! You have to go back to school in the evening, not too late." ”

"Deal!" Zhang Yifan said with a smile.

Immediately, the two stopped talking and were busy with their own work.

Shen Jing couldn't help but glance at the two of them, Chen Zhou and Zhang Yifan were both looking at the literature seriously, not at all like the ones who were talking and laughing just now.

"This is too fast, isn't it?" Shen Jing muttered to himself.

He didn't know that Zhang Yifan's study habits were basically when he was repeating high school, sitting next to Chen Zhou, and was pressed out by that pressure.

Not only Zhang Yifan, but the classmates around Chen Zhou have been more or less affected.

While Chen Zhou is changing, they are also silently changing.

Chen Zhou handed over the main finishing tasks to Zhang Yifan and Shen Jing respectively, which also gave him time to study more about the entire preparation process of diamond films.

Preparation methods can only be improved if they are fully understood.

Moreover, Chen Zhou did not plan to study the MPCVD method from the beginning.

He intends to be more comprehensive first and then seek a breakthrough.

There has been a shift in the preparation method of diamond films.

From the high temperature and high pressure in the 50s of the last century, to the CVD method first used by Japanese scientists in the early 80s, to today's multiple synthesis methods.

It is said that there are many synthesis methods, but in fact, they are all based on the CVD method and improved.

【Preparation of diamond film by hot filament CVD method (HFCVD)】

This literature provides a comprehensive introduction to the preparation of diamond films by HFCVD.

Although this method is the ancestor of the CVD method, it is still very common and has developed into one of the more mature methods for depositing diamond films.

This method requires a metal hot wire to be set above the substrate, commonly used like tungsten wire and tantalum wire.

The carbon-containing gas is then heated to 2000~2200 °C at a high temperature to decompose and form active particles.

In the presence of hydrogen atoms, diamonds are deposited on the substrate.

Although this method is simple, the deposition efficiency is very low, much lower than the method used by the 43rd Institute.

Not only that, but the process stability is poor, which is easy to cause pollution.

Although two methods of improvement are also mentioned in the literature, Chen Zhou also disagrees.

Because the efficiency is improved, but the quality of the diamond film is still too low.

For the study of diamond semiconductor materials and devices, it is obviously not applicable.

However, to improve the method, Chen Zhou felt that it could be tried.

One is the HFCVD method of reaction gas distribution, that is, carbon source gas and hydrogen are fed from the bottom and top of the hot wire, respectively.

The other is the electron-assisted HFCVD method, which increases the deposition rate by increasing the bias voltage of about 150 V to the substrate.

Chen Zhou's speed of reading literature is very fast, and even if he reads and memorizes at the same time, his efficiency far exceeds that of others.

This is also due to the bonuses provided by his systematic discipline upgrades.

Before coming, he quietly raised his chemistry to Lv2 in case he needed it.

Therefore, with the addition of chemistry subject level, Chen Zhou frantically absorbed relevant chemical knowledge.

Unlike studying mathematics and physics, Chen Zhou does not plan to use the same method to study chemistry and biology.

Chemistry and biology, two disciplines that are more inclined to experiments and applications, Chen Zhou intends to start with experiments and applications.

With the addition of subject levels, we can learn efficiently and find the unknown from experiments and applications.

Then make up for the unknown by checking the information.

Although there is no system of mathematics and physics, it is very efficient.

And it is very suitable for the current Chen Zhou.

After reading three articles on the HFCVD method, Chen Zhou felt that the general idea was similar, so he no longer entangled this method.

Instead, he began to look at the next method, Flame Deposition.

This method was first proposed by Japanese scholars, but it was confirmed in the laboratory on the other side of the Atlantic.

This method is mainly to mix carbon source gas and oxygen and burn it in the atmosphere.

The burning flame is divided into three zones, and in addition to the inner flame and the outer flame, there is also a reducing flame.

The substrate is placed in the reducing flame area of the flame to generate diamonds.

The key to this method is the mixing ratio of acetylene and oxygen.

Only in the R=0.7~1.0 region can it grow into diamond.

Other areas are not conducive to the growth of diamonds.

“R=0.97~1.0。 ”

Chen Zhou frowned slightly and looked at the interval written down.

He saw from the literature that when R=0.97~1.0, this method can prepare transparent optical grade diamond films.

Habitually taking a pen and clicking on some scratch paper, Chen Zhou skipped this information for the time being, and continued to read the literature.

[The advantages of this method are that the equipment is simple, the cost is low, the diamond can be synthesized in the atmosphere, the growth rate is fast (60~150um/h), and it is conducive to the deposition of diamond on the surface of large-area and complex-shaped samples. 】

[Its disadvantage is: the deposited diamond film has an uneven microstructure, the film often contains impurities such as non-diamond carbon, due to the thermal gradient of the flame, it is easy to bend and deform the substrate, and produce greater thermal stress in the film. 】

"One approach where the pros and cons are obvious. Chen Zhou commented.