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Conductive polymer gate FET devices for vapour sensing

Conductive polymer gate FET devices for vapour sensing
Conductive polymer gate FET devices for vapour sensing
The development of ultra low-power CMOS compatible gas sensors has been the goal of many research groups for a number of years. Such sensors benefit from both a low fabrication cost and an ease of integration with any associated transducer or signal processing circuitry. A sensor with these attributes is proposed comprising a novel chemFET sensor, with a conducting polymer gate, that operates at ambient temperature. Both electrochemically deposited and polymer composite materials have been deposited to form the gate electrode of an n-channel enhanced MOSFET (ECFET and PCFET, respectively). The authors present the first full characterisation of these sensors in terms of their response to pulses of ethanol and toluene vapour in air. In addition, environmental effects of temperature and humidity on both the baseline signal (i.e. zero vapour) and vapour response have been investigated. The PCFET and ECFET vapour sensitivities (operating at constant current) were found to be up to 5.5 muV/ppm and -2.3 muV/ppm for toluene and 0.6 muV/ppm and 4.5 muV/ppm for ethanol, respectively. The relative selectivity of the chemFET sensors was observed to be up to 564 for these two organics, with an observed sign change with certain polymers. In addition, the detection limits have been estimated to be below 1 ppm of toluene and ethanol vapour in air. It was also found that increasing temperature resulted in a reduction in both baseline and response signals, which the authors postulate is due to a reduction in the bulk solubility of the polymer. The authors believe that the low power of operation, range of polymers and integration with standard electronics makes these sensors ideal for a new range of hand-held electronic noses.
field-effect transistor, organic vapors, sensor, responses, arrays
1350-2409
326-334
Covington, J.A.
c5f24267-a0c0-4c17-82c9-0debbd6214af
Gardner, J.W.
2a4709f5-6243-4b73-8995-a7137c1d2315
Bartlett, P.N.
d99446db-a59d-4f89-96eb-f64b5d8bb075
Toh, C.S.
faf8cf8c-8408-4d88-9e64-e964a15b3872
Covington, J.A.
c5f24267-a0c0-4c17-82c9-0debbd6214af
Gardner, J.W.
2a4709f5-6243-4b73-8995-a7137c1d2315
Bartlett, P.N.
d99446db-a59d-4f89-96eb-f64b5d8bb075
Toh, C.S.
faf8cf8c-8408-4d88-9e64-e964a15b3872

Covington, J.A., Gardner, J.W., Bartlett, P.N. and Toh, C.S. (2004) Conductive polymer gate FET devices for vapour sensing. IEE Proceedings - Circuits, Devices and Systems, 151 (4), 326-334. (doi:10.1049/ip-cds:20040204).

Record type: Article

Abstract

The development of ultra low-power CMOS compatible gas sensors has been the goal of many research groups for a number of years. Such sensors benefit from both a low fabrication cost and an ease of integration with any associated transducer or signal processing circuitry. A sensor with these attributes is proposed comprising a novel chemFET sensor, with a conducting polymer gate, that operates at ambient temperature. Both electrochemically deposited and polymer composite materials have been deposited to form the gate electrode of an n-channel enhanced MOSFET (ECFET and PCFET, respectively). The authors present the first full characterisation of these sensors in terms of their response to pulses of ethanol and toluene vapour in air. In addition, environmental effects of temperature and humidity on both the baseline signal (i.e. zero vapour) and vapour response have been investigated. The PCFET and ECFET vapour sensitivities (operating at constant current) were found to be up to 5.5 muV/ppm and -2.3 muV/ppm for toluene and 0.6 muV/ppm and 4.5 muV/ppm for ethanol, respectively. The relative selectivity of the chemFET sensors was observed to be up to 564 for these two organics, with an observed sign change with certain polymers. In addition, the detection limits have been estimated to be below 1 ppm of toluene and ethanol vapour in air. It was also found that increasing temperature resulted in a reduction in both baseline and response signals, which the authors postulate is due to a reduction in the bulk solubility of the polymer. The authors believe that the low power of operation, range of polymers and integration with standard electronics makes these sensors ideal for a new range of hand-held electronic noses.

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More information

Published date: 1 August 2004
Keywords: field-effect transistor, organic vapors, sensor, responses, arrays

Identifiers

Local EPrints ID: 20175
URI: https://eprints.soton.ac.uk/id/eprint/20175
ISSN: 1350-2409
PURE UUID: ecb136a2-fb07-465b-9826-3f82eae80b27
ORCID for P.N. Bartlett: ORCID iD orcid.org/0000-0002-7300-6900

Catalogue record

Date deposited: 21 Feb 2006
Last modified: 06 Jun 2018 13:10

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Contributors

Author: J.A. Covington
Author: J.W. Gardner
Author: P.N. Bartlett ORCID iD
Author: C.S. Toh

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