Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 129, Issue 2, Pages 628-631Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2007.09.045
Keywords
50 ppb NO2 detection; carbon nanotube; dielectrophoretic; room temperature; Schottky barrier
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A NO2 gas sensor of carbon nanotubes (CNT) array was fabricated by a dielectrophoretic method. It is the first report of 50 ppb level detection operating at room temperature without a supplementary assistance of a heating system, vacuum environment, metal decoration, or additional film coating. The as-deposited CNTs on Pt electrodes by dropping of a CNT cropped solution provided good contact formation without post contact treatment. The bias voltage modulation improved the sensor performance by controlling the Schottky barrier potential. It is highly sensitive NO2 detection at room temperature, which may benefit to reduce the fabrication steps and cost as well. (C) 2007 Elsevier B.V. All rights reserved.
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