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Vol. 151, No. 4, April 2013, pp. 84-89




Study on Sensing Properties and Mechanism of Pd-doped SnO2 Sensor for Hydrogen and Carbon Monoxide
1 Qu ZHOU, 1 Weigen CHEN, 1 Lingna XU, 2 Shudi Peng

1 State Key Laboratory of Power Transmission Equipment & System Security
and New Technology, Chongqing University, Chongqing, 400030, China

2 Chongqing Electric Power Research Institute, Chongqing, 401123, China

1 Tel.: +86-23-65111172, fax: +86-23-65111172

E-mail: zhouqupsd@yahoo.cn, weigench@cqu.edu.cn, xulingna@cqu.edu.cn, psdzq@yahoo.cn


Received: 25 March 2013   /Accepted: 18 April 2013   /Published: 30 April 2013

Digital Sensors and Sensor Sysstems


Abstract: Hydrogen and carbon monoxide are important fault characteristic gases dissolved in power transformer oil. Online monitoring their concentrations can effectively reflect the running states of power transformers. Pure and Pd-doped SnO2 were successfully synthesized via a simple hydrothermal synthesis method, and characterized by X-ray powder diffraction and field-emission scanning electron microscopy, respectively. Sensors were fabricated by side-heated preparation technology and their gas sensing properties were systematically measured towards hydrogen and carbon monoxide. The Pd-doped SnO2 gas sensor exhibits excellent gas sensing performances, such as lower working temperature, higher gas response, rapid response and recovery time, than those of pure SnO2 gas sensor. Finally, a first principles calculation was conducted and the mechanism of the gas sensing process was discussed in detail. Such results make the sensor a promise candidate for hydrogen and carbon monoxide online detection.


Keywords: Tin oxide, Gas sensor, Hydrogen and carbon monoxide, Transformer oil, First principles


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