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

Sensors

Xiaoxing Zhang¹  Bing Yang²  Xiaojing Wang² 

[1] id="af1-sensors-12-09375">State Key Laboratory of Transmission & Distribution Equipment and Power System Safety and New Technology, Chongqing University, Chongqing 400030, Chi

关键词: carbon nanotubes;    gas sensor;    modification;   

DOI  :  10.3390/s120709375

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2012 by the authors; licensee MDPI, Basel, Switzerland.