Dielectrophoresis Carbon Nanotube and Conductive Polyaniline Nanofiber NH(3) Gas Sensor

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 conve...

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Bibliographic Details
Published in:Fēnxī huàxué 2012-01, Vol.40 (1), p.145-149
Main Authors: Chen, Da-Jing, Lei, Sheng, Wang, Ren-Hui, Pan, Min, Chen, Yu-Quan
Format: Article
Language:English
Subjects:
Carbon nanotubes
Dielectrophoresis
Gas sensors
Nanocomposites
Nanomaterials
Nanostructure
Response time
Sensors
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Summary: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 x 10(-6)(m/V) NH(3) with a response time of 60s. Carbon nanotube sensor shows good linearity in concentration range above 20 x 10(-6)(m/V) with a response time of 100-200 s. The fibers with smaller diameter show quicker response to NH(3) based on gas diffusion mechanism. Thus, CNT sensor and nanofiber-based sensors could be promising for gas sensing array and multi-chemical sensing applications.
ISSN:0253-3820
DOI:10.3724/SP.J.1096.2012.10451