UNSPECIFIED (2004) Smart ASIC chip for vapour detection based upon carbon black/polymer composite nanomaterials. In: Smart Structures and Materials 2004 Conference, MAR 15-18, 2004, San Diego, CA.

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Abstract

In this paper we report on the characterisation of a smart ASIC chip comprising a pair of room temperature resistive vapour sensors in a ratiometric configuration. This novel design enables the near elimination of several undesirable baseline effects and provides an automatic offset of the output signal. The novel ASIC chip has been designed(1.2) and fabricated through a standard 0.7 mum CMOS process. The ASIC response has been modelled prior to fabrication as reported elsewhere(1.3). There are two main stages in the circuit: one for the processing and conditioning of the sensor signals and the other for temperature control. Two sets of sensor electrodes are positioned in two opposite corners of the chip and are connected in a non-inverting operational amplifier configuration. Carbon black/polymer composite materials have been deposited across the electrodes to create the sensing chemoresistors and illustrate the functionality of the chip. Sample devices were created by depositing either the same nanomaterial on both electrodes and having one active and one passive sensor, or by depositing two different materials, thus creating two active sensors. Following deposition, the responses of the ASIC devices to toluene and ethanol vapours in air have been characterised in an automated mass flow system and presented here.

Item Type:	Conference Item (UNSPECIFIED)
Subjects:	Q Science > QC Physics
Series Name:	PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE)
Journal or Publication Title:	SMART STRUCTURES AND MATERIALS 2004: SMART ELECTRONICS, MEMS, BIOMEMS AND NANOTECHNOLOGY
Publisher:	SPIE-INT SOC OPTICAL ENGINEERING
ISBN:	0-8194-5306-4
ISSN:	0277-786X
Editor:	Varadan, VK
Date:	2004
Volume:	5389
Number of Pages:	11
Page Range:	pp. 344-354
Publication Status:	Published
Title of Event:	Smart Structures and Materials 2004 Conference
Location of Event:	San Diego, CA
Date(s) of Event:	MAR 15-18, 2004
URI:	http://wrap.warwick.ac.uk/id/eprint/7719

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