I Have a Research Support System

By the way, why didn't senior sister write a review? Xu Qiu asked puzzled, Wu Feifei and Duan Yunke both posted a review.

I want to write too, but my strength doesn't allow it, Chen Wanqing said with a sigh:

If I wrote it, it would be okay to publish it in a Chinese core journal, but I guess it would only be published in the second-ranked journal in English.

The main reason is that Mr. Wei has relatively high requirements for the review, and it is usually sent to the first district. He thinks that it is better not to write a review for the second district.

May I ask senior sister if she passed the sixth grade? Xu Qiu said.

Of course it has passed. Ph.D students have requirements for English scores. For example, my requirement in that year was to pass CET-6 with 450 points. I just passed the mark and scored 455 points, Chen Wanqing said:

I heard that the score has risen to 480 this year, and the threshold will definitely be higher and higher in the future. Fortunately, I came early.

By the way, have you prepared the XRD and SEM samples, and they will be tested in the afternoon.

I almost forgot, I haven't prepared yet, so how do I make a sample? Xu Qiu said.

The XRD sample is normally coated on a glass slide, and then in order to prevent the film from deteriorating, it needs to be vacuum-sealed and unpacked before testing.

The sample of SEM is also coated on the glass sheet. The glass sheet should be scratched from the back of it with a glass knife, and then broken into two halves to test the section.

For SEM samples such as organic thin films, they need to be quenched with liquid nitrogen to fix the film before breaking off. If it is perovskite, it is not necessary, and the sample can be prepared directly.

The preparation methods of these two samples are relatively simple, and Xu Qiu completed it in less than half an hour.

Among them, the equipment used for vacuum sealing is the electric heating vacuum sealing machine bought by TB.

Halfway through, Chen Wanqing went downstairs to make an appointment for the SEM test at 2:30.

…………

At 1:20 in the afternoon, the two went to test XRD as scheduled and came to room 104 on the second floor of the material.

Teacher Xu Hui is in charge of the instrument, and she also manages the atomic force microscope AFM.

Xu Qiu knew her. She was one of the teachers in the Materials Chemistry Experiment course, but the other party didn't seem to remember him.

They were the first to test in the afternoon, no one was testing ahead.

Therefore, after Chen Wanqing greeted Teacher Xu Hui, she went directly into the test room, installed samples, and prepared for the test.

She asked Feifei Wu about the XRD peak position of the perovskite material in advance, which is generally between 0-30 degrees, so she set the test angle to 1-30 degrees.

This is because the signal strength between 0-1 degree is too strong, in order to prevent the detection limit from exceeding the detector, the test starts from 1 degree.

The XRD equipment only occupies a few square meters, and there is a protective cover outside, and the sign Beware of ionizing radiation is posted on the instrument.

Seeing the equipment here, Xu Qiu said with emotion:

Compared to the volume of the Shanghai Synchrotron Radiation Light Source, the equipment here is a bit too small.

Of course, ordinary XRD can only detect small molecular materials with high crystallinity. Chen Wanqing said:

And because the brightness of X-rays on the light source is more than 100 million times that on this side, even organic polymer materials with weak crystallization properties can detect their crystallization information.

Xu Qiu nodded, he suddenly had an idea.

The simulation laboratory currently has only one laboratory, Room 216, on the first floor of the material.

And after it is upgraded to level 2, its volume increases to 1000 cubic meters, which is 10 times larger, and there is still a lot of space to use inside.

System, can this XRD instrument be copied into a simulated laboratory?

【Can. Copy succeeded. 】

Xu Qiu discovered that a new room had been opened up in the simulation laboratory, which was the current room 104, and the XRD instrument was also in it.

Sure enough, it can be copied, Xu Qiu thought in his mind:

In this case, all the instruments that can be used will be copied to the simulation laboratory in the future, and with the acceleration function, the progress of the experiment can take off.

Now that the instrument has been copied, it is natural to copy the skills.

Although the senior sister also has XRD skills, she must not be as proficient as Teacher Xu Hui.

System, recording Xu Hui's skills in X-ray diffractometer and atomic force microscope.

[Recorded successfully. 】

Xu Qiu checked the proficiency, and it turned out that Teacher Xu Hui's two skills were above 0% of the fifth level.

After finishing these, Xu Qiu turned his attention back to reality.

The test results of the first sample have come out, and the sample has three peaks at 7 degrees, 14 degrees, and 21 degrees respectively.

It took about half an hour to test the remaining three samples.

Copying data is a little more complicated.

Usually, in order to prevent viruses, the computers of these large-scale equipment are neither connected to the Internet nor directly plugged into a USB flash drive.

You need to share folders to another computer through My Network Places to copy data files.

The two took the data, completed the experiment registration, said hello to Teacher Xu Hui, and left.

…………

Back on the first floor of the materials, Xu Qiu processed the XRD data that he had just obtained, made pictures, and went to test the SEM with his senior sister.

When he came to the door of the SEM room, Xu Qiu saw that the door was covered with traces of time, so he said:

This door looks so old. I have bought this electron microscope for many years.

It should be more than ten years, Chen Wanqing said: So the images taken with it are sometimes blurry. I guess this electron microscope will be retired in a few years.

However, we just measure the thickness, and we don't have too high requirements. If you want to pursue the quality of the picture, you can go to the Department of Chemistry to check the equipment. They seem to have just replaced a new SEM instrument two years ago.

After Xu Qiu knocked on the door, the two of them entered the room, and a chill suddenly spread across the surface.

Huh, it's so cold. Xu Qiu shivered.

Yes, the operating temperature of SEM instruments is generally around 20 degrees, so the air conditioner needs to be turned on to the lowest level in summer, and liquid nitrogen will be used later to cool down the temperature. Chen Wanqing explained.

Xu Qiu nodded and began to observe the SEM equipment.

Although the door here is very broken, but from the outside, the maintenance of the equipment is not bad.

The sample chamber is placed on a shock-proof table, and then connected to an operating computer, and an old teacher sits next to the computer.

Ms. Hu, let's take the SEM of the section and measure the thickness of the sample, Chen Wanqing handed over the Petri dish containing the sample.

Here's a sample.

After that, Teacher Hu was in charge of the whole process, while Xu Qiu and Chen Wanqing sat beside and watched.

Because it is only testing the thickness of the sample, it is relatively simple. You only need to find the position of the film and glass, enlarge it, place it in the center of the screen, and then take a photo.

Before taking a photo, Teacher Hu will confirm with Chen Wanqing.

Xu Qiu made five samples of FAPbCl3 films at different concentrations, and finally got five pictures in total.

Through a computer window, a bright perovskite film can be seen.

Through the software, Mr. Hu calculated the film thickness of each sample and marked it on the picture.

Among them, the film thickness of the sample under the optimal condition is about 28 nanometers.

Before leaving, Xu Qiu also copied this laboratory and Mr. Hu's SEM skills.