Improvement and mechanism for the fast response of a Pt/TiO2 gas sensor
Improvement and mechanism for the fast response of a Pt/TiO2 gas sensor
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DOI：
10.1016/j.snb.2010.05.001
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发表时间：
2010-06
影响因子：
8.4
通讯作者：
Maolin Zhang;Zhanheng Yuan;Jianping Song;Cheng Zheng
中科院分区：
文献类型：
--
作者：
Maolin Zhang;Zhanheng Yuan;Jianping Song;Cheng Zheng
铂被广泛用于改善气体传感器的响应特性。本工作旨在提高Pt/TiO 2传感器暴露于H2/O2的响应速率。传感层的表面改性的H2 PtCl 6-含有溶液和处理在不同的条件下。在900°C下处理的传感器在暴露于H2时显示出约40毫秒（ms）的响应时间，而在500-800°C下暴露于O2时显示出约20 ms的响应时间。结果表明，反映传感器电阻变化率的响应时间受活化能E的控制。具有较低活化能的传感器表现出更快的响应速率时，响应的幅度是近似均匀的。另一方面，通过增加分散在传感器表面上的铂颗粒的量经由溢出效应来促进响应特性。
Platinum is widely used in improving the response properties of gas sensors. This work aims to promote the rate of response of a Pt/TiO2sensor exposed to H2/O2. The surface of the sensing layer was modified by an H2PtCl6-containing solution and treated under different conditions. The sensor treated at 900°C showed a response time of about 40 millisecond (ms) when exposed to H2and 20ms exposed to O2at 500–800°C. Results indicate that the response time, which reflects the rate of change of the sensor resistance, was controlled by the activation energy (E). Sensors with lower activation energy exhibited a faster rate of response when the magnitude of response was approximately uniform. The response properties, on the other hand, were promoted by increasing the amount of platinum particles dispersed on the sensor surface via a spill-over effect.