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Vol. 156, Issue 9, September 2013, pp. 310-316




Synthesis, Characteristics and Enhanced Sulfur Dioxide Sensing Properties of Cu-doped SnO2 Microspheres
* Shudi Peng, Gaolin Wu, Wei Song

Chongqing Electric Power Research Institute, Chongqing, 401123, China

* Tel.: +86-23-63230512, fax: +86-23-63230512
E-mail: pengshudi@163.com, 13983842134@139.com, 48012641@qq.com


Received: 5 August 2013   /Accepted: 25 August 2013   /Published: 30 September 2013

Digital Sensors and Sensor Sysstems


Abstract: Sulfur dioxide (SO2) is a typical sulfur hexafluoride (SF6) decomposition by product in gas insulated switchgear (GIS). Online monitoring and analyzing SO2 gas concentration can timely and effectively evaluate the insulation performance of SF6-gas-insulated apparatus. In this study, pure and 3 at % Cu-doped SnO2 microspheres were synthesized via a simple and facile hydrothermal method, and were characterized by X-ray powder diffraction, field emission scanning electron microscopy, transmission electron microscopy, energy dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy, respectively. Chemical gas sensors were fabricated with the conventional indirect heating technology and their gas sensing properties versus SO2 were investigated in detail. The gas sensor fabricated with 3 at % Cu-doped SnO2 microspheres exhibits lower optimum operating temperature and higher gas response than that of pure SnO2 microspheres. Meanwhile, it demonstrates good stability and fast response-recovery. Most importantly, this sensor holds excellent discrimination with other SF6 decompositions, including SOF4, SOF2, SO2F2 and HF. All results provide a good candidate in fabricating high-performance SO2 sensor in practice.


Keywords: Sulfur dioxide, Gas sensing properties, Cu-doped SnO2, Chemical gas sensor.


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