Sensors & Transducers Journal
(ISSN 1726- 5479)
Vol. 85, Issue 11, November 2007, pp.1721-1727
Gas Detectors Based on Single Wall Carbon Nanotubes by Exploiting the Dielectrophoresis Method
Lun-Wei Chang and *Juh-Tzeng Lue
Department of Electrical Engineering
*Department of Physics
National Tsing Hua University, Hsin Chu, Taiwan
Received: 7 October 2007 /Accepted: 20 November 2007 /Published: 26 November 2007
Abstract: Single wall carbon nanotube is developed for detecting various gases and vapors attributed to its peculiar mechanic structure and electronic property. We implemented a dielectrophoresis method to deposit desired amounts of carbon nanotubes on adjacent electrodes and investigate their conductivity variations at low gas pressures. The sensor exposed to extremely rare traces (in part per million) of CH4, H2, CO2 and acetone is capable of yielding response and showing saturation at a higher concentration. We propose a mechanism to portray that limited reaction surfaces are subjected to be saturated at high gas concentration. It is expected that the resistivity of carbon nanotubes are highly affected by the exposing to polar solvent vapor such as acetone. Much sensing of carbon nanotubes based sensors is highly appraised to detect chemical gases and organic vapors.
Keywords: Gas sensors, Single-walled carbon nanotubes, Dielectrophoresis method
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