Abstract
Abstract. Sulfonated single-walled carbon nanotubes have been used in an integrated electrode structure for the detection of carbon monoxide. The sensor responds to 0.5 ppm of CO in air at room temperature. All eight sensors with this material in a 32-sensor array showed good repeatability and reproducibility, with response and recovery times of about 10 s. Pristine nanotubes generally do not respond to carbon monoxide and the results here confirm sulfonated nanotubes to be a potential candidate for the construction of an electronic nose that requires at least a few materials for the selective detection of CO.
Highlights
Carbon monoxide (CO) is an air pollutant and known to have an effect of on global warming
A comparison of the SWCNTs before and after functionalization reveals that their morphology and structure changed after sulfonation
SWCNTs are covered by a layer of a foreign material, which can be groups of the sulfonic acids (Alamdari et al, 2012)
Summary
Carbon monoxide (CO) is an air pollutant and known to have an effect of on global warming. Low or room temperature operation of metal oxide based sensors is not that common, though recently Pd / SnO2 sensors have been shown to have a good sensitivity in the range of 6–18 ppm of CO at a temperature of 60 ◦C (Kim et al, 2013). A. Hannon et al.: Room temperature carbon nanotube based sensor reactions with SWCNTs – either donating an electron to or withdrawing from the nanotubes – which leads to a change in the resistance (or other measureable properties such as capacitance) of the CNTs. SWCNTs have been found to be useful to sense even large molecules (such as nitrotoluene, malathion, etc.) that do not participate in change transfer; in these cases, the molecules can make a conducting bridge between adjacent SWCNTs in an intertube modulation mechanism (Li et al, 2003). We present CO detection results using sulfonated SWCNTs with a good response down to 0.5 ppm
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