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Abstract

In this paper – which was first presented at the 5th IEEE Conference on Sensors in Daegu, Republic of Korea, October 2006 – an improvement of the gas-sensing properties of the single-wall carbon nanotube (SWNT) by functionalizing its surface is reported upon. SWNTs were functionalized with sodium dodecyl sulphate (SDS), which improved the gas-sensing properties of the SWNTs. Solutions of SWNTs were deposited on the alumina substrate prepatterned with Pt contacts and heater to form the sensors. The morphology of the SWNT films were characterized by atomic force microscope (AFM) and transmission electron microscope (TEM) imaging, and their gas-sensing properties were studied using a voltamperometric technique. The sensors' sensitivity was tested in the presence of O₃ (70–350 ppb), NO₂ (0.1–5 ppm), CO (500 ppm), and NH₃ (5 ppm) diluted in humid air (50 per cent relative humidity (RH)). The working temperature was varied in the range 20 °C–70 °C. The sensors showed an appreciable response to low concentrations of 70 ppb of ozone and 100 ppb of NO₂, while showing virtually no response to CO and NH₃.

Keywords

single-wall carbon nanotube functionalization gas sensor

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Functionalized single-wall carbon nanotube-based gas sensor

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