I Have a Research Support System

After lunch on Friday, Xu Qiu came to Caiyi 216.

After greeting the friends in the laboratory, he sat next to Chen Wanqing.

Sister, didn't you forget to help me prepare the substrate?

Of course I didn't forget, I made 24 zinc oxide substrates this morning, Chen Wanqing said:

It should be enough for the two of us, let's make an inverted structure device this time.

Okay, what about the solution? Is the dissolution of the polymer good? Xu Qiu said:

Chen Wanqing shook her head and said:

The first batch of samples was soluble, but the solutions of the second batch of samples all had solid materials hanging on the wall.

Chloroform has a low boiling point and cannot be heated at high temperature. I heated the solution of chlorobenzene solvent to 90 degrees Celsius, and I will wait until the afternoon to see how it dissolves.

If the solubility is not good, would it be better to filter the solution through a filter? Xu Qiu thought for a moment, then added:

However, if it is filtered, some of the polymer material will be filtered out, resulting in a lower solution concentration and a change in the donor-acceptor ratio.

The filter head must be made of polytetrafluoroethylene, otherwise the filter membrane will be dissolved, Chen Wanqing said:

How about the specific effect, you will know if you try it in the afternoon.

That's right, who will spin coat the effective layer this afternoon? Xu Qiu asked.

Let's leave this crucial step to you, Chen Wanqing said with emotion:

It feels like your experimental operation level has caught up to mine now.

Don't dare to do it, don't dare to do it. Xu Qiu waved his hands modestly.

...

At 1:20, Xu Qiu got up on time, intending to grab the glove box in advance.

Seeing this, Wu Feifei said helplessly:

Chen Wanqing in the morning and you in the afternoon, why is it so difficult for me to do an experiment?

We only need to spin coat the effective layer in the afternoon, Xu Qiu said:

If it's fast, you should still be able to make a batch of devices.

Forget it, today is Friday, I only started making devices in the afternoon, and I have to work overtime in the evening. Wu Feifei said:

Anyway, I made a few batches of devices when you were away a few days ago, and the data for this week should be enough.

It seems that Wu Feifei doesn't really want to do experiments in her heart, she just came here to complain.

Xu Qiu nodded at her and walked into the laboratory.

He entered the spin-coating glove box, while Chen Wanqing stood beside him.

Two people have a total of two materials, two batches of each, two solvents in each batch, and a total of eight sets of solutions.

The two batches of materials he made were PBT4T-1 and PBT4T-2.

The two batches of materials from the senior sister are PBDTBTTT11-1 and PBDTBTTT11-2 respectively.

From the naming point of view, her ternary polymer donor material uses BDT as the D unit, BT and TT as the A unit, and 11 means that the molar ratio of the two A units is 1:1.

Because the name was too long to record, Xu Qiu recorded the two batches of materials as 1# and 2# respectively, and the sister's as 3# and 4#.

There were eight groups of solutions on the heating and stirring table, Xu Qiu picked them up one by one to observe.

Judging from the dissolution situation, 1# and 3# with relatively small molecular weights, corresponding to the four groups of solutions, all dissolve well, and there are almost no solid particles in the naked eye.

For the four groups of solutions corresponding to 2# and 4# with relatively high molecular weight, there are solid substances hanging on the wall of the bottle.

After thinking for a moment, Xu Qiu decided to apply 1# chloroform solution first to see the situation.

He picked up a zinc oxide substrate, put it down again, and picked up a piece of glass again.

It is safer to test the water with a piece of glass.

He just set one of the spin coating conditions:

3000 rpm, 60 seconds, spraying.

Anyway, it is only the initial stage of exploration, as long as these conditions are not too outrageous, they are all acceptable, and detailed adjustments will need to be made in the future.

Xu Qiu put down the glass sheet on the spin coating platform, pressed the start button of the spin coater, and sprayed the solution.

The two stared eagerly at the rotating platform.

Finally, the platform stopped spinning.

Xu Qiu picked up the glass piece and checked it. The film was generally smooth, but there were also a few dust-sized solid particles on it.

No, it seems that some polymers are still not dissolved, but they cannot be seen with the naked eye.

Try filtering. Chen Wanqing said.

Xu Qiu nodded, tore open the package of a disposable syringe, removed the needle, and sucked up about 400 microliters of 1# chloroform solution.

In the process of drawing up the solution, he was very careful.

Because in the simulation laboratory before, when he did the same operation, after the outer wall of the syringe came into contact with chloroform, the red pigment on it was dissolved into the chloroform.

Although it is not clear what effect will be caused by mixing a little pigment in the solution, there is a high probability that it will have a negative impact, and it can be avoided if it can be avoided.

Fortunately, there was no accident this time. He installed a polytetrafluoroethylene filter head at the front of the syringe, and applied a piece of glass by drip coating.

This time the film is relatively uniform, and no solid particles appear, indicating that the filtration is still effective.

However, the color of the film painted after the solution is filtered is lighter than that of the unfiltered one.

He re-spin-coated a piece on the zinc oxide substrate and got today's first sample 1#, CF, 3000r, G, D

Material No. 1, chlorobenzene solvent, 3000 rpm, filter, drop coating.

He then filtered the remaining solution in the syringe into a disposable centrifuge tube and sprayed it on a substrate again.

Next, Xu Qiu tried the 1# sample of chlorobenzene solvent, and found that it also needs to be filtered, and a uniform film can be obtained after filtration.

One piece was prepared by spin coating and spray coating respectively.

A total of four samples were obtained.

Xu Qiu also made four samples for the 3# sample of the senior sister.

No accidents happened.

...

After dealing with 1# and 3#, now it is the turn of the four groups of solutions of 2# and 4#.

Looking at the four sets of solutions, Xu Qiu said, I don't think these are easy to handle, so let's put them on the filter directly.

Okay. Chen Wanqing nodded.

Xu Qiu took a disposable syringe, removed the needle, and sucked up 400 microliters of 2# chloroform solution.

After installing the filter head, Xu Qiu put the filter head against the disposable centrifuge tube and tried to push the piston.

No, there is a lot of resistance, and I can't push it.

Use some strength. Chen Wanqing said.

If you use too much force, I'm afraid something will go wrong. Xu Qiu said.

However, although the senior sister's proposal is a bit unreliable, it has already done this.

The arrow is on the string and has to be fired.

Xu Qiu thought for a while and said:

I'll take a protective measure.

After speaking, he emptied out the surrounding things, and then spread them with lens cleaning paper.

Then put a large disposable rubber glove on top of the rubber glove that comes with the glove box.

Everything was ready, Xu Qiu held the centrifuge tube with his left hand, and vigorously pushed the plunger of the disposable syringe with his right hand.

The moment he used his strength, the filter head exploded, and blue liquid erupted from the crack, splashing around.

Fortunately, Xu Qiu took protective measures in advance, and most of the solution was absorbed by the lens cleaning paper and disposable rubber gloves.

It should be that there are too many insoluble polymers, and there is no way to filter them. Xu Qiu finished the analysis and began to clean up the mess.

He collected the lens cleaning paper, then took off the disposable rubber gloves, revealing blue and black rubber gloves, and said:

By the way, does this scene seem familiar?

Thanks to Lan Shiyu and Shanfeng for the 500 starting point reward, this damn novel wasted my youth's 1000 point reward.