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

E-mail: jtlue@phys.nthu.edu.tw

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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