NO2 detection at room temperature with copper phthalocyanine thin film devices

Newton, MI ORCID: 0000-0003-4231-1002, Starke, TKH, Willis, MR and McHale, G, 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: Journal article
Publication Title: Sensors and Actuators B-Chemical
Creators: Newton, M.I., Starke, T.K.H., Willis, M.R. and McHale, G.
Publisher: Elsevier
Date: 2000
Volume: 67
Number: 3
ISSN: 0925-4005
Identifiers:
NumberType
10.1016/S0925-4005(00)00542-6DOI
Divisions: Schools > School of Science and Technology
Depositing User: EPrints Services
Date Added: 09 Oct 2015 11:06
Last Modified: 09 Jun 2017 13:49
URI: http://irep.ntu.ac.uk/id/eprint/22773

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