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. 2012;12(7):9375-85.
doi: 10.3390/s120709375. Epub 2012 Jul 9.

Effect of plasma treatment on multi-walled carbon nanotubes for the detection of H2S and SO2

Xiaoxing Zhang  1 , Bing Yang, Xiaojing Wang, Chenchen Luo
Affiliations

Effect of plasma treatment on multi-walled carbon nanotubes for the detection of H2S and SO2

Xiaoxing Zhang et al. Sensors (Basel). 2012.

Abstract

H(2)S and SO(2) are important characteristic gases of partial discharge (PD) generated by latent insulated defects in gas insulated switchgear (GIS). The detection of H(2)S and SO(2) 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 H(2)S and SO(2), respectively. The results show that the sensitivity and response time of modified MWNTs to H(2)S are both improved, whereas the opposite effects are observed for SO(2). The modified MWNTs have almost zero sensitivity to SO(2). Thus, the MWNTs modified by atmospheric pressure DBD air plasma present good selectivity to H(2)S, and have great potential in H(2)S detection.

Keywords: carbon nanotubes; gas sensor; modification.

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Figures

Figure 1.
Figure 1.
The scheme of the modifying experiment setup.
Figure 2.
Figure 2.
Expected Lissajous curve.
Figure 3.
Figure 3.
Discharge waveforms and Lissajous curve (a) voltage and current waveform and voltage instantaneous power waveform; (b) Lissajous curve.
Figure 4.
Figure 4.
The scheme of the detecting chamber.
Figure 5.
Figure 5.
Response of MWNTs-based gas sensors to (a) H2S; (b) SO2.
Figure 6.
Figure 6.
Resistance change of MWNTs modified by plasma at 60 s.
Figure 7.
Figure 7.
MWNTs-based gas sensors reversibility testing curve.
Figure 8.
Figure 8.
SEM images of the unmodified and modified MWNTs (a) unmodified; (b) and (c) modified for 60 s.
Figure 9.
Figure 9.
Infrared spectrums of unmodified and modified MWNTs.
Figure 10.
Figure 10.
Schematic of modified MWNTs absorbing gas molecules (a) SO2; (b) H2S.
See this image and copyright information in PMC

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