Chapter 17: Rhetorical question

　　 Seeing that Xu Qiu’s expression was not right, Chen Wanqing also realized that what she had just said might be ambiguous, so she quickly added:
　　 "I mean scientific research."
　　 Xu Qiu breathed a sigh of relief and thought: "She should have been sent by Teacher Wei to inquire about my willingness to protect the research."
　　 After considering the wording, he said: "We have to wait to see the results of the insurance research. I am very interested in Mr. Wei's research direction, um, the senior sister is also good, and gave me a lot of help."
　　 "Hmm," Chen Wanqing was a little embarrassed: "Actually, I didn't help you much, basically relying on your own efforts. In less than a week, you have mastered more than half of the device preparation process."
　　 Xu Qiu knows that he can improve so fast, relying to a large extent on the auxiliary system to replicate the senior sister's skills and provide him with real-time guidance, but he certainly can't tell.
　　 The chat atmosphere was a bit awkward, and Xu Qiu decided to go away.
　　 He glanced at the stopwatch, there was less than 20 minutes to count down, and said:
　　 "Sister, the annealing time is approaching, I will do the experiment first."
　　 "Ok, let's go." Chen Wanqing said.
　　……
　　 Xu Qiu came to the heating stirrer and observed the annealed substrate. The color of the PEDOT:PSS film coated on it became darker, indicating that most of the water had evaporated.
　　 Then check the system interface. The instruments and tools involved in the spin coating operation include: ozone generator, homogenizer, disposable syringe, tweezers, pipette, heating stirrer, etc.
　　 Among them, the ozone generator and the homogenizer are newly added, and the proficiency is not high. Taking advantage of the ten minutes of annealing, Xu Qiu started to learn the proficiency.
　　Because the operation of the two instruments is relatively simple, it quickly reached the fourth order.
　　 After reaching the preset thermal annealing time, Xu Qiu turns off the heating function of the heating stirrer, allowing the temperature of the substrate to naturally drop to room temperature.
　　 Next, is the last step of the spin coating process, wipe the film.
　　The ITO electrode is at the edge of the square substrate. In order to ensure that the final battery device is continuously routed, the film on the outer edge of the substrate needs to be erased to expose the electrode.
"The erasing depth is about 0.3 cm, and the side length of the substrate is 2.54 cm, so the final expectation is a square film with a side length of about 1.96 cm in the center of the substrate.
　　The solvent used is anhydrous methanol, soak a little with a cotton swab, and then rub the surface of the film harder until the electrode is exposed.
　　 Xu Qiu carefully wiped the film without any accident, and finally obtained 11 processed ITO/PEDOT substrates.
　　 Put the substrate back into the petri dish, affix a label with "PEDOT6.6XQ", and place it in the cabinet under the experimental table.
　　Although Xu Qiu is the only one doing experiments in the laboratory for the time being, and it does not matter if he does not write a label, good research habits should be cultivated from the beginning.
　　 In case an important experimental sample is thrown away as by others because it does not write a label, the loss may be immeasurable.
　　 In addition, experimental data and textual materials are equally important.
　　 Xu Qiu once heard that a doctoral student from a friend school next door lost a laptop with experimental data and graduation thesis on the eve of graduation.
　　Because he didn't back up the data, he collapsed on the spot after learning that the computer was hopelessly recovered, and fell to the ground, crying.
　　……
　　 Xu Qiu then proceeded to the preparation of zinc oxide film.
　　This preparation process uses the sol-gel method. The zinc oxide prepolymer solution is previously configured as a sol, and then a gel is formed during the spin coating process, and finally zinc oxide nanoparticles are generated by heating.
　　The solvent used, 2-methoxyethanol has reproductive toxicity, so it is necessary to prepare a solution in a glove box for spin coating.
　　 Although it doesn't talk about the dosage, but only talks about the toxicity, it is a hooliganism, but Xu Qiu will not deliberately die, try to test how toxic this thing is.
　　 He transfers the ozone-treated substrate to the glove box, then uses a disposable syringe to up the zinc oxide prepolymer solution, and installs a 0.22 micron PTFE filter.
　　 Place the substrate, drop the solution, and start the homogenizer.
　　5000r.p.m., 30 seconds.
　　 After coating the 12 substrates, start to wipe the films, and the solvent is still methanol.
　　 This time the wiping process must be advanced before annealing, because zinc oxide nanoparticles are formed after annealing, and it will be difficult to erase.
　　 Finally, annealing at 180 degrees Celsius for 30 minutes.
　　Although there is a heating stirrer in the glove box, because the set temperature is too high, it is dangerous to operate in the glove box, so it needs to be transferred to the outside for annealing.
　　 Ordinary glass petri dishes may not be able to withstand such high temperature and break, so special thick petri dishes are needed.
　　 Finally, 10 ITO/zinc oxide substrates were obtained, labeled "ITO/ZnO6.6XQ", and stored in the cabinet.
　　……
　　 The experiment is over, Xu Qiu finds Chen Wanqing and joked:
　　 "Senior sister, what are your plans for the future?"
　　 Chen Wan glanced at Xu Qiu innocently, and asked:
　　 "Research?"
　　 "Otherwise?" Xu Qiu asked back.
　　 "Hmm... let me think about it." Chen Wanqing fell into thinking.
　　"Let’s see if the work done during the PhD period went smoothly, and whether I can post enough articles to graduate successfully.
　　 If it goes well, it depends on whether you can apply to a better research group abroad to do postdoctoral work, and then return to China for two years, and then find a university as a teacher.
　　 It’s better to go back to China earlier. The earlier you come back, the greater your advantage. Now it’s not easy to go abroad. There are more and more returnees, and the pressure of competition is also increasing. UU reading www.uukａnshu.com
　　I wouldn’t want to go out unless most books require overseas research experience to hold a teaching position. "
　　 "What if it doesn't go well?" Xu Qiu interrupted in due course.
　　 "You really know how to answer." Chen Wanqing spit out and continued:
　　 "If it doesn't go well or can't find a good post, it means that the academic circle is not suitable for me.
　　 Then I have to find a job, find a corporate research and development post, it is best to do something related to my current research, such as solar cells, OLEDs and the like.
　　 Or just go to some big factories, such as Hua Wei and Fujisun. They value academic qualifications, but my first academic qualifications are not from Mordu University. The competitiveness is slightly weaker, but it will not be worse. "
　　 Xu Qiu didn't expect that he would casually make a joke, and the senior sister answered seriously.
　　 Just when he didn't know how to reply, the senior sister's phone rang a WeChat alert tone.
　　 Xu Qiu took advantage of the trend to change the subject: "Boyfriend Cha Gang?"
　　 "What do you want, I'm still single, where's my boyfriend, is Teacher Wei's WeChat."
　　 "What did he say?"
　　 "Here, see for yourself." She handed the phone to Xu Qiu.
"how is it?"
　　 There are only two simple words and a question mark.
　　 Chen Wanqing took back her phone and typed her reply: "I am changing the article, and I will post the latest draft to your mailbox later. Xu Qiu is learning spin coating today."
　　 Soon, I again received an elderly emoji package "Okay" and a text "Close the doors and windows when you leave."
　　 "This is Teacher Wei who is checking the post." Xu Qiu said.
　　 "Yes, Mr. Wei went to the hospital for treatment every Friday afternoon, so he would learn about the laboratory situation remotely." Chen Wanqing said.