Abstract
Carbon nanotube(NT) and single polyaniline nanofiber gas sensors were introduced.Carbon nanotube gas sensor was synthesized by means of dielectrophoresis.Nanofiber sensor was directly deposited as single nanofiber across two gold electrodes by means of near-field electrospinning without the conventional lithography process.The nanofiber sensor shows a 2.7% reversible resistance change to 1×10-6(m/V) NH3 with a response time of 60 s.Carbon nanotube sensor shows good linearity in concentration range above 20×10-6(m/V) with a response time of 100-200 s.The fibers with smaller diameter show quicker response to NH3 based on gas diffusion mechanism.Thus,CNT sensor and nanofiber-based sensors could be promising for gas sensing array and multi-chemical sensing applications.
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