Ethanol gas sensors were produced using vertically aligned carbon nanotubes (CNTs) synthesized by thermal chemical vapor deposition from ethylene at 700°C. Scanning electron microscopy showed that the average length and average diameter of the CNTs were about 4.52 μm and 45 nm, respectively. Carbon nanotube ethanol gas sensors with and without adsorbed Au particles of 5nm diameter were fabricated. With an 800 ppm ethanol vapor concentration at room temperature, the sensitivity of a carbon nanotube ethanol gas sensor was increased from 1.67% to 3.28% by the adsorption of Au particles.
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Young et al. (2012) studied this question.
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