UNSPECIFIED (1999) Polymeric resistive bridge gas sensor array driven by a standard cell CMOS current drive chip. In: 12th European Conference on Solid-State Transducers - 9th UK Conference on Sensors and Their Applications, SEP 13-16, 1998, SOUTHAMPTON, ENGLAND.

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Abstract

Gas-sensitive micro-bridge devices, fabricated with four conducting polymer resistive elements, have been characterised using a standard cell Complementary Metal-Oxide Semiconductor (CMOS) current drive chip and precision linear analog interface circuitry. Poly(aniline) (PAN) types of polymers were used to create the four resistive elements, while two, opposite arms of the micro-bridge were passivated by a protective coating of either epoxy resin or nafion. The standard cell analog current drive chip was designed to supply currents in the micro-amp range through an array of six resistive polymer micro-bridge devices. The chip was fabricated using the Alcatel Mietec 2.4 mu m CMOS process. It exhibits good d.c. stability, and a linear temperature coefficient of about - 1.2 x 10(-3)/degrees C. The chip can be driven in an a.c. as well as in a d.c, mode and gives a stable pulsed current source at frequencies of up to 10 kHz. The output voltages of all of the current-driven micro-bridges were observed to follow the Langmuir adsorption isotherm. The nafion-coated bridges exhibited a substantially reduced sensitivity to ambient humidity and, rather surprisingly, a positive temperature coefficient. (C) 1999 Elsevier Science S.A. All rights reserved.

Item Type:	Conference Item (UNSPECIFIED)
Subjects:	Q Science > QD Chemistry
Journal or Publication Title:	SENSORS AND ACTUATORS B-CHEMICAL
Publisher:	ELSEVIER SCIENCE SA
ISSN:	0925-4005
Date:	21 September 1999
Volume:	58
Number:	1-3
Number of Pages:	8
Page Range:	pp. 518-525
Publication Status:	Published
Title of Event:	12th European Conference on Solid-State Transducers - 9th UK Conference on Sensors and Their Applications
Location of Event:	SOUTHAMPTON, ENGLAND
Date(s) of Event:	SEP 13-16, 1998
URI:	http://wrap.warwick.ac.uk/id/eprint/14016

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