本文選題：CuO + CuO/ZnO復(fù)合材料　； 參考：《黑龍江大學(xué)》2015年碩士論文

【摘要】：在各種各樣的空氣污染物中,NOx是一種有毒氣體,大于1 ppm的NOx可以危害人體的呼吸系統(tǒng)以及肺組織。因此,在室溫下制備高靈敏度以及具有快速響應(yīng)時間的NOx的穩(wěn)定傳感器變得尤為重要。氧化銅和氧化鋅是優(yōu)秀的半導(dǎo)體材料,它們廣泛地應(yīng)用在氣敏傳感器領(lǐng)域。所以,本文通過一步簡單的回流法可控合成了CuO材料以及CuO/ZnO復(fù)合材料,在室溫的條件下對其進行NOx氣敏測試,同時初步對氣敏機理進行了探討。首先,以硝酸銅(Cu(NO3)2·3H2O)為基底,PEO-PPO-PEO block copolymer(P123)為表面活性劑,氨水(NH3·H2O)作為沉淀劑的條件下,通過改變Cu(NO3)2·3H2O的濃度、回流時間以及回流溫度,合成了由納米片自組裝的多級結(jié)構(gòu)的CuO微球,并對其在室溫下進行氣敏測試。實驗結(jié)果表明:CuO對97 ppm的NOx氣體的靈敏度可達到64.36%,響應(yīng)時間為8.67 s,檢測限最低達到0.97ppm。增強的氣敏性能是由于多級結(jié)構(gòu)為目標氣體提供更大的接觸面積。其次,在制備純CuO的回流條件下,加入Zn(NO3)2,合成出Cu O/ZnO復(fù)合材料(CZ),并在室溫下進行NOx氣敏性能的測試。實驗中Zn(NO3)2·6H2O與Cu(NO3)2·3H2O質(zhì)量為30%的時候合成的CZ-30的復(fù)合材料有最佳的性能。測試結(jié)果表明,CZ-30對97 ppm NOx靈敏度為91.22%,響應(yīng)時間僅為4.0 s,檢測限可達0.97 ppm。合成的CuO/ZnO復(fù)合材料表現(xiàn)出p型半導(dǎo)體特性。由于在復(fù)合材料中Zn的加入使得材料的導(dǎo)電性提高,EIS及Mott-Schottky測試表明,電荷更加容易轉(zhuǎn)移,從而提高響應(yīng)速度。因此,合成的CuO/ZnO復(fù)合材料比純CuO表現(xiàn)出了更好的氣敏性能。
[Abstract]:Among all kinds of air pollutants, no _ x is a toxic gas. No _ x > 1 ppm can harm human respiratory system and lung tissue. Therefore, it is very important to prepare a stable no _ x sensor with high sensitivity and fast response time at room temperature. Copper oxide and zinc oxide are excellent semiconductor materials, they are widely used in gas sensor field. Therefore, CuO materials and CuO / ZnO composites were synthesized by a simple reflux method in this paper. No _ x gas sensing test was carried out at room temperature, and the gas sensing mechanism was also discussed. Firstly, using copper nitrate (Cu (no _ 3) _ 2 3H _ 2O) as substrate PEO-PPO-PEO block copolymer (P123 as surfactant and ammonia water (NH _ 3H _ 2O) as precipitant, the multi-level structure CuO microspheres were synthesized by changing the concentration of Cu (no _ 3) _ 2 _ 3H _ 2O, reflux time and reflux temperature. The gas sensitivity was measured at room temperature. The experimental results show that the sensitivity of 1: CuO to no _ x gas of 97 ppm is 64.36, the response time is 8.67 s, and the detection limit is 0.97 ppm. Enhanced gas sensitivity is due to the multi-level structure providing larger contact area for the target gas. Secondly, CuO / ZnO composites (CZ) were synthesized by adding Zn (no _ 3) _ 2 under the reflux condition of pure CuO, and the no _ x gas sensing properties were measured at room temperature. When the mass ratio of Zn (no _ 3) _ 2 6H _ 2O and Cu (no _ 3) _ 23H _ 2O is 30%, the CZ-30 composite has the best properties. The results show that the sensitivity of CZ-30 to 97 ppm NOx is 91.22, the response time is only 4.0 s, and the detection limit is 0.97 ppm. The synthesized CuO / ZnO composites exhibit p-type semiconductor properties. Due to the addition of Zn in the composite, the conductivity of the composite is improved by EIS and Mott-Schottky test. It is shown that the charge transfer is easier and the response speed is improved. Therefore, the synthesized CuO / ZnO composites exhibit better gas sensitivity than pure CuO / ZnO composites.
【學(xué)位授予單位】：黑龍江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：X831;TB33

【參考文獻】

相關(guān)期刊論文 前1條

1 鄭高峰;何廣奇;劉海燕;鄭建毅;李文望;孫道恒;;電紡氧化鋅納米纖維乙醇、丙酮氣敏傳感器[J];光學(xué)精密工程;2014年06期

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本文編號：2082371