本文選題：ZnO + Li摻雜�。� 參考：《華中科技大學(xué)》2015年碩士論文

【摘要】：Zn O氣敏傳感器由于具有敏感度高、響應(yīng)/恢復(fù)迅速、成本低以及長(zhǎng)期穩(wěn)定性好等優(yōu)點(diǎn),已廣泛應(yīng)用于食品生產(chǎn)、大氣檢測(cè)、醫(yī)療衛(wèi)生、航空航天等領(lǐng)域。本研究采用實(shí)驗(yàn)室自主研發(fā)的氣敏材料高通量篩選測(cè)試平臺(tái)對(duì)Zn O及Li摻雜Zn O進(jìn)行了系統(tǒng)的氣敏性能及溫阻特性研究,分析了Li摻雜對(duì)Zn O缺陷化學(xué)性質(zhì)及氣敏性能的影響,建立了以缺陷化學(xué)理論為基礎(chǔ)的氣敏機(jī)理模型并成功解釋了Li摻雜對(duì)氣敏性能的影響途徑。主要工作包括:(1)分別采用均相沉淀法和水熱法制備了不同Li摻雜量及不同摻雜方式的Li摻雜Zn O。通過(guò)材料微觀表征手段對(duì)兩種Li摻雜方式進(jìn)行了表征和驗(yàn)證。(2)通過(guò)絲網(wǎng)印刷工藝將制得的Zn O氣敏材料制成氣敏測(cè)試元件并進(jìn)行了氣敏性能和溫阻特性測(cè)試。測(cè)試結(jié)果表明均相沉淀法原子比x=0.1的Li摻雜Zn O具有最佳的氣敏性能,在350℃下其對(duì)100 ppm的甲醛和甲醇的敏感度分別高達(dá)40.2和71.5。(3)結(jié)合缺陷化學(xué)理論對(duì)Li摻雜Zn O氣敏材料的溫阻特性測(cè)試結(jié)果進(jìn)行了分析,解釋了Zn O內(nèi)部缺陷在不同溫度段的行為和性質(zhì)。(4)依據(jù)缺陷化學(xué)理論,建立了以氧空位和氧間隙協(xié)同作用為基礎(chǔ)的氣敏機(jī)理模型。該模型認(rèn)為,在氣敏響應(yīng)過(guò)程中氧空位和氧間隙分別作用于氧吸附階段和氣敏響應(yīng)階段,它們的協(xié)同作用是使氣敏性能提高的關(guān)鍵。
[Abstract]:Due to its high sensitivity, rapid response / recovery, low cost and good long-term stability, Zno gas sensor has been widely used in food production, atmospheric detection, medical and health, aerospace and other fields. The gas sensing properties and temperature resistance properties of Zn O and Li doped Zn O were systematically studied by using the high throughput screening test platform developed by the laboratory. The effects of Li doping on the chemical properties and gas sensing properties of Zn O defects were analyzed. A gas sensing mechanism model based on defect chemistry theory was established and the influence of Li doping on gas sensing performance was successfully explained. The main work includes: (1) Li-doped ZnO with different Li doping amounts and different doping modes were prepared by homogeneous precipitation method and hydrothermal method respectively. Two kinds of Li doping methods were characterized and verified by means of micro-characterization of materials. (2) the Zno gas sensing materials were made into gas sensing test elements by screen printing technology and the gas sensing properties and temperature resistance characteristics were tested. The results show that Li doped Zn _ 2O with atomic ratio of x _ (10) _ (0.1) by homogeneous precipitation method has the best gas sensitivity. At 350 鈩，

本文編號(hào)：1939351