研究生: |
高祥富 Xiang-Fu Gao |
---|---|
論文名稱: |
氧化鋅奈米桿與薄膜之氣體感測研究 Studies on the gas sensing properties of ZnO nanorods and thin film |
指導教授: |
劉進興
Chin-Hsin J. Liu |
口試委員: |
戴龑
Yian Tai 何國川 Kuo-Chuan Ho |
學位類別: |
碩士 Master |
系所名稱: |
工程學院 - 化學工程系 Department of Chemical Engineering |
論文出版年: | 2008 |
畢業學年度: | 96 |
語文別: | 中文 |
論文頁數: | 98 |
中文關鍵詞: | 噴霧裂解法 、水熱法 、氧化鋅 、氣體感測 |
外文關鍵詞: | Spray pyrolysis, Hydrothermal method, ZnO, gas sensor |
相關次數: | 點閱:352 下載:1 |
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本研究分為兩部分,第一部分為利用噴霧裂解法(Spray pyrolysis)及水熱法(Hydrothermal method),製備氧化鋅薄膜及氧化鋅奈米桿;第二部分我們將氧化鋅薄膜及奈米桿製備成感測器(Sensor)元件,檢測二氧化氮(NO2)及氨氣(NH3)。本研究著重於表面形態不同(薄膜和奈米桿)對於感測之影響。
在NO2感測中,其機制是直接抓取氧化鋅的傳導電子,使導電度下降,所以表面積越大,或奈米桿長度越長,其導電度下降就越多。而在NH3感測中,氣體是和表面的氧離子反應,而氧離子的生成是和氧化鋅中氧缺陷有關,所以我們利用Photoluminescence來測量不同直徑的奈米桿其PL的變化。結果發現,水熱法在濃度為0.05M(直徑~70nm)時導電度變化最高,所以氨氣的感測不是隨表面積變化,而是和製備氧化鋅時本身缺陷所造成的影響有關。
當奈米桿在氮氣環境下退火,溫度越高(150℃~350℃)時,Photoluminescence中的可見光強度逐漸降低,相對UV放光強度增加,這是因為退火會使氧化鋅中的缺陷減少而使氧化鋅結晶性逐漸完整。而這種現象也反應到氣體感測上,缺陷較多的奈米桿相較於缺陷較少的奈米桿,其靈敏度相對增加,這再次證明,氧化鋅感測還原性氣體時,須要較多的缺陷。
This thesis consists of two parts.In part one,Spray pyrolysis and Hydrothermal method are used to deposit the ZnO thin film and the ZnO nanorod,respectively. In part two,gas sensors based onboth type of ZnO are used to detect NO2 and NH3 gas. This study is focused on the effect of ZnO morphology on its sensing property.
In terms of sensing NO2 gas,the sensing mechanism was directly capturing the electrons from the conduction band and the conductivity was lowering.So,the changes of conductivity of NO2 gas sensing was related to the suface area or the height of the nanorods. In terms of sensing NH3 gas,however,the gas reacted with the oxygen ion on the surface of the ZnO,and the oxygen ion came from the defects of ZnO. So,we used the Photoluminescence to measured the changes of the different diameter of the nanorods. As it turn out,the change of conductivity was the highest when the Hydrothermal concentration was 0.05M(diameter is about 70nm). So,the gas sensing ability of NH3 gas was not corresponded to the surface area of nanorods.but the inherence of defects of ZnO .
Furthermore,we annealed the nanorods in the N2 atmosphere.When the annealing temperature is higher,the intensity of visible light in Photoluminescence is gradually lower and the intensity of UV light is getting higher. This phenomenon is because that when we anneal the nanorods the defects are reduced,and the crystal property is getting perfect.However,gas sensor property is favored of nanorods with more defects.
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