Microstructure and sensing properties of CdS-ZnO1-x coatings deposited by liquid plasma spray and treated with hydrogen peroxide solution for nitrogen dioxide detection at room temperature
Microstructure and sensing properties of CdS-ZnO1-x coatings deposited by liquid plasma spray and treated with hydrogen peroxide solution for nitrogen dioxide detection at room temperature
复制标题
液体等离子喷涂和过氧化氢溶液处理的CdS-ZnO1-x涂层的微观结构和传感性能用于室温二氧化氮检测
DOI：
10.1016/j.jallcom.2016.06.079
复制
发表时间：
2016-12-05
影响因子：
6.2
通讯作者：
Zhang, Chao
中科院分区：
文献类型：
--
作者：
Geng, Xin;You, Jiajun;Zhang, Chao
金属氧化物半导体气体传感器在室温下对目标气体的响应通常较慢且较弱。本文报道了一种基于多孔硫化镉锌氧化物的二氧化氮气体传感器。涂层采用敏化、表面改性和可见光照明相结合的方法来改善传感特性。采用液态等离子喷涂工艺制备了多孔硫化镉-氧化锌涂层。然后在过氧化氢溶液中对涂层表面进行改性，使其产生氧空位，最终得到CdS-ZnO1-x涂层。利用光致发光光谱、电子顺磁共振和UV-Vis漫反射光谱仪对所获得的薄膜的氧空位和光学性质进行了表征。UV-Vis结果表明，处理后得到的涂层的吸收范围扩展到整个可见光区域。测试并比较了两种涂层的二氧化氮气敏性能。气敏结果表明，表面修饰(表面氧空位)可以大大提高传感器的响应速度，显著缩短响应时间和恢复时间。根据氧空位的影响，讨论了所制备的CdS-ZnO1-x薄膜的传感机理。(C)2016爱思唯尔B.V.保留所有权利。
Metal oxide semiconductor gas sensors usually respond slowly and weakly to target gas at room temperature. In this paper, we report a nitrogen dioxide gas sensor based on porous CdS-ZnO1-x. coatings using a combination of sensitization, surface modification and visible light illumination methods to improve sensing characteristics. Porous CdS-ZnO coatings were deposited by liquid plasma spraying process. Then the coating surface was modified by immersing in a hydrogen peroxide solution and annealing to generate oxygen vacancies and finally obtain CdS-ZnO1-x coatings. Photoluminescence spectroscopy, electron paramagnetic resonance and UV-Vis diffuse reflectance spectrophotometer were utilized to characterize the oxygen vacancies and optical properties of the obtained coatings. The UV-Vis results revealed that the absorption of the obtained coatings was extended to the whole visible light region after the treatment. Nitrogen dioxide gas sensing properties of the CdS-ZnO and CdS-ZnO1-x coatings were measured and compared. The gas sensing results showed that the surface modification (surface oxygen vacancies) can greatly enhanced sensor responses and significantly shortened the response time and recovery time. The sensing mechanism of the obtained CdS-ZnO1-x coatings was discussed in terms of the effect of oxygen vacancies. (C) 2016 Elsevier B.V. All rights reserved.