Sensors 2013, 13(11), 15209-15220; doi:10.3390/s131115209
Article

Sensitivity Characteristic Analysis of Adsorbent-Mixed Carbon Nanotube Sensors for the Detection of SF6 Decomposition Products under PD Conditions

State Key Laboratory of Transmission & Distribution Equipment and Power System Safety and New Technology, Chongqing University, Chongqing 400040, China
* Author to whom correspondence should be addressed.
Received: 16 August 2013; in revised form: 14 October 2013 / Accepted: 29 October 2013 / Published: 7 November 2013
(This article belongs to the Section Chemical Sensors)
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Abstract: Sulfur hexafluoride (SF6) gas decomposition results from the energy produced by partial discharge (PD). The detection of SO2 and H2S content, as important characteristic components of the decomposition products, is significant in the determination of the insulation level of SF6 gas and the inside insulation faults of gas-insulated equipment. A number of gas sensors use carbon nanotubes (CNTs). However, the applications of these sensors are limited by their low intrinsic sensitivity. In this paper, an adsorbent-mixed carbon nanotube gas sensor is proposed to improve the detection of SO2 and H2S concentrations. The sensitivity of adsorbent-mixed carbon nanotube gas sensors to SO2 and H2S at 100 ppm was investigated experimentally. The effect of the mixing ratio on the gas sensitivity characteristic and mechanism of response was also studied. The results show that compared with intrinsic CNTs gas sensors, the gas sensor featuring adsorbent-mixed CNTs has significantly higher sensitivity and responsiveness to SO2 and H2S. The resistance-change rate of SO2 and H2S increased to 33.7% and 50.9% from 0.96% and 12.9%, respectively. Moreover, the resistance-change rate and gas concentration satisfy a linear relationship. The sensor has good repeatability and stability.
Keywords: SO2; H2S; PD; carbon nanotube; adsorbent; gas sensor; gas response

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MDPI and ACS Style

Zhang, X.; Luo, C.; Tang, J. Sensitivity Characteristic Analysis of Adsorbent-Mixed Carbon Nanotube Sensors for the Detection of SF6 Decomposition Products under PD Conditions. Sensors 2013, 13, 15209-15220.

AMA Style

Zhang X, Luo C, Tang J. Sensitivity Characteristic Analysis of Adsorbent-Mixed Carbon Nanotube Sensors for the Detection of SF6 Decomposition Products under PD Conditions. Sensors. 2013; 13(11):15209-15220.

Chicago/Turabian Style

Zhang, Xiaoxing; Luo, Chenchen; Tang, Ju. 2013. "Sensitivity Characteristic Analysis of Adsorbent-Mixed Carbon Nanotube Sensors for the Detection of SF6 Decomposition Products under PD Conditions." Sensors 13, no. 11: 15209-15220.

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