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Durham University

Research & business

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Publication details for Professor Andy Monkman

BARKER, PS, DIBARTOLOMEO, C, MONKMAN, AP, PETTY, MC & PRIDE, R (1995). GAS-SENSING USING A CHARGE-FLOW TRANSISTOR. Sensors And Actuators B-chemical 25(1-3): 451-453.
  • Publication type: Journal Article
  • ISSN/ISBN: 0925-4005
  • Keywords: CHARGE-FLOW TRANSISTORS; GAS SENSORS; POLYANILINEPOLYANILINE; FILMS

Author(s) from Durham

Abstract

We report on the successful fabrication of an array of charge-flow
transistors incorporating polyaniline films. The electrical d.c.
characteristics have been found to be similar to those of conventional
metal-oxide-semiconductor field-effect transistors. However, on
application of a gate voltage, V-gs greater than the threshold voltage,
a delay is observed in the response of the drain current. This is
attributable to the time taken for the resistive polyaniline layer to
charge up to V-gs. These delay characteristics have been found to be
dependent upon the ambient, suggesting that the charge-flow transistor
device can be used as an effective gas sensor. Results are presented of
studies using NOx and SO2, showing that the device can detect
reversibly gas concentrations down to 1 ppm.