Pd-doped TiO2 film sensors prepared by premixed stagnation flames for CO and NH3 gas sensing
Pd-doped TiO2 film sensors prepared by premixed stagnation flames for CO and NH3 gas sensing
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DOI：
10.1016/j.snb.2018.01.173
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发表时间：
2018-05-15
影响因子：
8.4
通讯作者：
Zhang, Hai
中科院分区：
文献类型：
--
作者：
Pan, Fengjiao;Lin, He;Zhang, Hai
采用旋转表面火焰稳定技术（FSRS）制备了不同Pd掺杂比例的Pd-TiO 2薄膜。半导体金属氧化物（SMO）颗粒与Pd添加剂在火焰后区凝聚，然后直接沉积在固定在旋转装置上的传感器基体上形成传感膜。利用TEM、SEM、XPS、XRD和EDS等测试技术对敏感膜的组成和结构进行了分析。结果表明，采用FSRS技术制备的TiO_2颗粒粒径在9 ~ 17 nm之间，为锐钛矿型。Pd掺杂的TiO 2薄膜保持了多孔性，Pd元素在薄膜中分散良好。传感测试结果表明，FSRS技术制备的纳米薄膜传感器对CO浓度变化响应迅速，而对NH3浓度变化响应较慢。Pd的掺杂显著提高了TiO 2传感器对CO的响应灵敏度，对NH3的响应灵敏度也有一定的提高。存在一个最佳掺杂比例，掺杂1.0wt.%的TiO 2薄膜传感器样品钯掺杂比的气敏性能最好。(C)2018由Elsevier B. V.出版
This paper synthesized Pd-TiO2 films by the flame stabling on a rotating surface (FSRS) technique with different doping ratios of Pd. The semiconductor metal oxide (SMO) particles together with Pd additive condensed in the post flame zone, and then deposited directly on a sensor subtract which is fixed on a rotating plant to form the sensing films. The composition and structure of sensing films were assessed with TEM, SEM, XPS, XRD and EDS techniques. It was found that TiO2 particles prepared by the FSRS technique had diameters ranging from 9 to 17 nm and are in anatase type. Pd-doped TiO2 films remained porous anatase and Pd element dispersed well in the TiO2 film. The sensing test results showed that the nano film sensors synthesized by FSRS technique responded rapidly to CO concentration change while rather slowly to NH3 concentration change. The doping Pd improved the response sensitivity of TiO2 sensor remarkably for CO sensing, and a certain extent for NH3. An optimal doping ratio existed and the TiO2 film sensor sample with 1.0 wt.% Pd-doping ratio had the best gas sensing performance. (C) 2018 Published by Elsevier B.V.