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Durham University

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Publication details for Professor Andy Monkman

Barker, PS, Monkman, AP, Petty, MC & Pride, R (1997). Electrical characteristics of a polyaniline/silicon hybrid field-effect transistor gas sensor. Iee Proceedings-circuits Devices And Systems 144(2): 111-116.
  • Publication type: Journal Article
  • ISSN/ISBN: 1350-2409
  • Keywords: gas-sensitive MOSFET; nitrogen dioxide detector; polymer/silicon FETFILMS

Author(s) from Durham


The fabrication of an array of polyaniline/silicon hybrid field-effect
transistors is reported. The DC electrical characteristics have been
found to be similar to those of conventional enhancement-mode
metal-oxide-semiconductor devices. Investigations into the
capacitance-voltage characteristics, the temperature dependence of the
threshold voltage and the isothermal operating point were undertaken
for devices with and without the polymeric material deposited within
gaps in the gate electrodes. A delay observed in the response of the
drain current on application of a gate voltage is shown to be dependent
on both temperature and the presence of certain gases. This effect can
be used to detect reversibly nitrogen dioxide at a concentration of 8
parts per million.