Low temperature electrochemical deposition of nanoporous ZnO thin films as novel NO2 sensors
Low temperature electrochemical deposition of nanoporous ZnO thin films as novel NO2 sensors
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纳米多孔 ZnO 薄膜的低温电化学沉积作为新型 NO2 传感器
DOI：
10.1016/j.electacta.2012.12.060
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发表时间：
2013-02-15
影响因子：
6.6
通讯作者：
Zhang, Jingbo
中科院分区：
文献类型：
--
作者：
Bai, Shouli;Sun, Chuanzhen;Zhang, Jingbo
采用低温一步电化学沉积法在钛基片上制备了纳米多孔ZnO薄膜，并将其应用于新型NO2传感器。所制备的薄膜的多孔结构可以通过在沉积槽中添加曙红Y的量来控制。对ZnO薄膜的晶体结构和形貌进行了表征。研究了ZnO薄膜的表面结构和缺陷对氧吸附和气敏性能的影响。传感测试结果表明，ZnO多孔薄膜对NO2气体具有很高的灵敏度。在较低温度下，该传感器对NO2的响应高于对CH4和CO的响应，表明该传感器具有良好的传感选择性。光致发光分析表明，由于ZnO中施主的相对含量大于受主的相对含量，ZnO的本征传感特性是由ZnO中的本征缺陷引起的。这项工作提出了一个新的可能性和有用的电化学制备的ZnO多孔薄膜，并可以引起有趣的选择，开发其他新型传感器。(C)2012爱思唯尔有限公司保留所有权利。
The nanoporous ZnO thin films were prepared on Ti substrate by the low temperature, one-step electrochemical deposition for a novel NO2 sensor. The porous structure of the prepared thin films can be controlled by the added amounts of eosin Y in the deposition bath. The crystalline structure and morphologies of ZnO thin films were characterized. The effect of the surface structure and defects of ZnO thin films on the adsorption of oxygen and the gas sensing performance were investigated. The sensing test results indicate that the ZnO porous thin films have high sensitivity toward NO2. On the other hand, the response to NO2 is higher than that to CH4 and CO at relative low temperature indicating its good sensing selectivity. The intrinsic sensing characterization is attributed to the native defects in ZnO because the relative content of donors is more than that of the acceptors, which was confirmed by the photoluminescence analysis. This work presents a new possibility and usefulness of such electrochemically prepared ZnO porous thin film and can give rise to interesting option for developing other novel sensors. (C) 2012 Elsevier Ltd. All rights reserved.