A comparative study on UV light activated porous TiO2 and ZnO film sensors for gas sensing at room temperature
A comparative study on UV light activated porous TiO2 and ZnO film sensors for gas sensing at room temperature
复制标题
室温气体传感用紫外光激活多孔 TiO2 和 ZnO 薄膜传感器的比较研究
DOI：
10.1016/j.ceramint.2011.07.035
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发表时间：
2012-01-01
影响因子：
5.2
通讯作者：
Liao, Yichuan
中科院分区：
文献类型：
--
作者：
Chen, Hao;Liu, Yuan;Liao, Yichuan
为了寻找一种筛选高灵敏度光敏气敏材料的新途径，进行了对比研究。采用丝网印刷技术，以TiO2和ZnO为原料，制备了室温下使用的紫外光激活气敏元件。为了便于同时测量两种材料的电流瞬变，将它们印刷在同一氧化铝基板上。与ZnO相比，TiO2对乙醇和甲醛气体具有上级性能。结果发现，TiO2的响应随测试气体的浓度增加，并达到224和1700至100 ppm的乙醇和甲醛气体，分别，而100 ppm的乙醇和甲醛气体的ZnO的响应分别为0.14和1.5，分别。并对TiO_2和ZnO之间这种巨大差异的机理进行了详细的讨论。此外，我们认为具有较低光暗电流比的金属氧化物半导体可以获得较高的光活化气体灵敏度。(C)2011 Elsevier Ltd和Techna Group S.r.l. All rights reserved.
In order to find a new approach for screening the photoactivated gas sensing materials with high sensitivity, a comparative study was carried out. With the simple technique of screen printing, TiO2 and ZnO were used to fabricate the UV light activated gas sensors which were applied at room temperature. To facilitate the simultaneous measurements of the current transients of the two materials, they were printed on the same alumina substrate. Compared with ZnO, TiO2 exhibited a superior performance to ethanol and formaldehyde gases. It was found that the responses of TiO2 increased with the concentration of test gas and amounted to 224 and 1700 to 100 ppm ethanol and formaldehyde gases, respectively, while the responses of ZnO to 100 ppm ethanol and formaldehyde gases were 0.14 and 1.5, respectively. The mechanism of such a huge difference between TiO2 and ZnO was discussed in detail. Furthermore, it is suggested that metal oxide semiconductor with lower photo-to-dark current ratio can achieve higher photoactivated gas sensitivity. (C) 2011 Elsevier Ltd and Techna Group S.r.l. All rights reserved.