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• Zhang, X
• Yang, B
• Wang, X
• Luo, C
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• Yang, B
• Wang, X
• Luo, C
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• Zhang, X
• Yang, B
• Wang, X
• Luo, C

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Sensors 2012, 12(7), 9375-9385; doi:10.3390/s120709375

Article

Effect of Plasma Treatment on Multi-Walled Carbon Nanotubes for the Detection of H₂S and SO₂

Xiaoxing Zhang* , Bing Yang, Xiaojing Wang and Chenchen Luo

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

* Author to whom correspondence should be addressed.

Received: 6 April 2012; in revised form: 27 June 2012 / Accepted: 28 June 2012 / Published: 9 July 2012

(This article belongs to the Section Chemical Sensors)

Download PDF Full-Text [1296 KB, uploaded 9 July 2012 09:20 CEST]

Abstract: H₂S and SO₂ are important characteristic gases of partial discharge (PD) generated by latent insulated defects in gas insulated switchgear (GIS). The detection of H₂S and SO₂ is of great significance in the diagnosis and assessment of the operating status of GIS. In this paper, we perform experiments on the gas sensitivity of unmodified multi-walled carbon nanotubes (MWNTs) and those modified by atmospheric pressure dielectric barrier discharge (DBD) air plasma at different times (30, 60 and 120 s) for H₂S and SO₂, respectively. The results show that the sensitivity and response time of modified MWNTs to H₂S are both improved, whereas the opposite effects are observed for SO₂. The modified MWNTs have almost zero sensitivity to SO₂. Thus, the MWNTs modified by atmospheric pressure DBD air plasma present good selectivity to H₂S, and have great potential in H₂S detection.

Keywords: carbon nanotubes; gas sensor; modification

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