NO2 detection at room temperature with copper phthalocyanine thin film devices

Newton, Michael, Starke, T. K., Willis, M. R. and McHale, Glen (2000) NO2 detection at room temperature with copper phthalocyanine thin film devices. Sensors and Actuators B: Chemical, 67 (3). pp. 307-311. ISSN 0925-4005

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Abstract

In this work, we report the effect of post-deposition film treatment on the NO2 sensing properties of CuPc thin films for room temperature operation. The gas-sensitive response of the electrical conductivity to doping with NO2, doping with oxygen (in air) and cooling to 77 K in liquid nitrogen are reported. The pretreatment with NO2 is shown to improve the gas sensing properties by providing both an increase in the magnitude of the conductivity change for a given NO2 concentration and a significant improvement in the recovery time. Data is analysed using an Elovich model, which suggests that the cooled devices have the best fit to this model; the data for the NO2 doped devices suggest a Langmuir behaviour. For all devices, a simple time derivative of the change in current provides a measure of concentration for real time gas sensing applications.

Item Type:	Article
Uncontrolled Keywords:	Phthalocyanine, Nitrogen dioxide, Thin film, Gas sensor
Subjects:	F300 Physics
Department:	Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User:	Becky Skoyles
Date Deposited:	09 Jun 2017 10:16
Last Modified:	12 Oct 2019 19:05
URI:	http://nrl.northumbria.ac.uk/id/eprint/31015

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