Chapter 92: The OA

　　 After lunch on Friday, Xu Qiu came to Caiyi 216.
　　 After saying hello to his friends in the laboratory, he sat next to Chen Wanqing.
　　 "Senior sister, did you forget to prepare the substrate for me?"
　　 "Of course I did not forget, I made 24 zinc oxide substrates in the morning," Chen Wanqing said:
　　 "It should be enough for the two of us. Let's make a structural 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 dissolution of the first batch of samples is okay, but the solutions of the second batch of samples have solid materials hanging on the wall.
　　Chloroform has a low boiling point and cannot be heated at a high temperature. I have heated the solution of chlorobenzene solvent to 90 degrees Celsius. I will wait to see the dissolution in the afternoon. "
　　 "If the solubility is not good, will it be better to filter the solution with a filter?" Xu Qiu thought for a moment, and added:
　　 "However, if it is filtered, part of the polymer material will be filtered out, resulting in a lower concentration of the solution and a change in the donor-acceptor ratio."
　　 "The filter should be made of PTFE, otherwise the filter membrane will be dissolved," Chen Wanqing said:
　　 "What is the specific effect, you will know if you try it in the afternoon."
　　 "Yes, who will spin coat the effective layer in the afternoon?" Xu Qiu said.
　　 "Leave this critical step to you," Chen Wanqing said with emotion:
　　 "I feel like your experimental operation level has caught up with me now."
　　 "Don't dare to be, don't dare to be." Xu Qiu waved his hand modestly.
　　……
　　At 1:20, Xu Qiu got up on time, planning to seize the glove box in advance.
　　 Seeing this, Wu Feifei said helplessly:
　　 "It's 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 is fast, you should be able to make a batch of devices."
　　 "Forget it, today Friday, I only started making devices in the afternoon, and I will work overtime at night." Wu Feifei said:
　　 "Anyway, I made several batches of devices when you were away a few days ago. This week's data should be enough."
　　 It seems that Wu Feifei doesn't really want to experiment in her heart, just to complain.
　　 Xu Qiu nodded at her and walked into the laboratory.
　　 He enters the spin-coating glove box, while Chen Wanqing is standing by.
　　 There are two kinds of materials for two people, two batches of each, two solvents in each batch, and a total of eight groups of solutions.
　　 The two batches of materials he made are PBT4T-1 and PBT4T-2.
　　Senior sister’s two batches of materials are PBDTBTTT11-1 and PBDTBTTT11-2.
　　 From the point of view of naming, her ternary polymer donor material uses BDT as the D unit and BT and TT as the A unit. 11 means that the molar ratio of the two A units is 1:1.
　　Because the name is too long to record, Xu Qiu recorded its two batches of materials as 1# and 2#, and Xuejie’s as 3# and 4#.
　　 There were eight groups of solutions on the heating and stirring table, and Xu Qiu picked them up and observed them one by one.
　　 From the perspective of dissolution, 1# and 3# with relatively small molecular weight, the corresponding four groups of solutions, dissolve well, and there are almost no solid particles in the naked eye.
　　The relatively high molecular weight 2# and 4# corresponding to the four groups of solutions have 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 clamped a zinc oxide substrate, put it down, and clamped a glass sheet again.
　　 It’s safer to test the water with glass slides.
　　 spin-coating conditions, he randomly set one:
　　 3000 revolutions, 60 seconds, spraying.
　　 Anyway, it is only the initial stage of exploration. As long as these conditions are not too outrageous, they are all possible, and detailed adjustments will be required in the future.
　　 Xu Qiu puts down the glass slide on the spin-coating platform, presses the spin-coater start button, and sprays the solution.
　　 The two men stared at the rotating platform eagerly.
　　 Finally, the platform stopped spinning.
　　 Xu Qiu picked up a piece of glass and looked at it. The film was generally smooth, but there were also several dust-sized solid particles on it.
　　 "No, it seems that some of the polymer has not dissolved, but it is not visible to the naked eye."
　　 "Try filtering." Chen Wanqing said.
　　 Xu Qiu nodded, tore open the packaging of a disposable syringe, removed the needle, and absorbed about 400 microliters of 1# chloroform solution.
　　 In the process of absorbing the solution, he was very careful.
　　Because when he did the same operation in the simulation laboratory before, after the outer wall of the syringe was in contact with chloroform, the red pigment on it was dissolved in 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 effect. If it can be avoided, it should be avoided.
　　 Fortunately, no accident happened this time. He added a Teflon filter to the front of the syringe and applied a piece of glass by drip coating.
　　 The film is relatively uniform this time, and no solid particles appear, indicating that the filtration is still effective.
　　 But the color of the film coated after the solution is filtered is lighter than that of the unfiltered one.
　　 He re-spinned a piece of zinc oxide substrate and got today’s first sample "1#, CF, 3000r, G, D"
　　 No. 1 material, chlorobenzene solvent, 3000 revolutions, filtration, drip coating.
　　 Then, he filtered the remaining solution in the syringe into a disposable centrifuge tube, and sprayed a piece of 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 filtering.
　　 spin coating and spray coating methods each prepared one piece.
　　 A total of four samples were obtained.
　　 Xu Qiu helped Xuejie's 3# sample and made four samples.
　　 No accident happened.
　　……
　　 After processing 1# and 3#, UU Reading www.uukanshu.com now has the four sets of 2# and 4# solutions.
　　 Looking at these four sets of solutions, Xu Qiu said: "I don't think these are very good, so let's just put it on the filter head."
　　 "Okay." Chen Wanqing nodded.
　　 Xu Qiu brought a disposable syringe, removed the needle, and absorbed 400 microliters of 2# chloroform solution.
　　 After installing the filter head, Xu Qiu put the filter head on the disposable centrifuge tube and tried to push the piston.
　　 "No, there is a lot of resistance, I can't push."
　　 "Put harder." Chen Wanqing said.
　　 "If you use too much force, I am afraid that something will happen." Xu Qiu said.
　　 However, although the senpai's proposal is a bit unreliable, she has already done it.
　　 The arrow is on the string and I have to send it.
　　 Xu Qiu thought for a while and said:
　　 "I will make a protective measure."
After 　　 finished, he emptied the surrounding things and then covered it with lens cleaning paper.
　　 Then put a large disposable rubber glove on the rubber glove that comes with the glove box.
　　Everything is ready, Xu Qiu holds the centrifuge tube with his left hand, and pushes the piston of the disposable syringe with his right hand.
　　 At the moment he used his power, the filter burst open, and the blue liquid erupted from the crack and splashed around.
　　 Fortunately, Xu Qiu took precautions in advance, and most of the solution was absorbed by lens wiping paper and disposable rubber gloves.
　　 "It should be that there are too many insoluble polymers, and there is no way to filter it." Xu Qiu finished analyzing and began to clean up the mess.
　　 He collected the lens cleaning paper, then took off the disposable rubber gloves, revealing the blue and black rubber gloves, and said:
　　 "By the way, is this scene familiar?"