Effects of heat-treatment on chemical, morphological and no2-sensing properties of lead phthalocyanine films

Wilson, Alan and Rigby, G. Patricia and Wright, John D. and Thorpe, Stephen C. and Terui, Toshifumi and Maruyama, Yusei (1992) Effects of heat-treatment on chemical, morphological and no2-sensing properties of lead phthalocyanine films. Journal of Materials Chemistry, 2 (3). pp. 303-308. ISSN 0959-9428. (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Thick sublimed films of lead phthalocyanine which have been heated in air at 360-degrees-C for 1 h show rapid conductivity changes on exposure to NO2, with some slow components remaining. These slow components are more evident for high NO2 concentrations, and increase in magnitude on prolonged exposure to the gas. Electron probe microanalysis (EPMA), scanning electron microscopy (SEM) and X-ray diffraction (XRD) experiments to characterise the effects of heat treatment on the chemical and structural nature of the films are reported, and both morphological and chemical mechanisms for the rapid response are discussed. These results, together with previous secondary-ion mass spectrometry (SIMS), X-ray photoelectron spectroscopy (XPS), infrared (IR) spectroscopy and calorimetric studies, and the absence of corresponding effects for planar copper phthalocyanine, strongly support selective reaction of strong adsorption sites as the most likely origin of the kinetic effects. The advantages and limitations of sensors using this material are discussed.

Item Type: Article
Uncontrolled keywords: phthalocyanine; gas sensor; conductivity; heat treatment; nitrogen dioxide
Subjects: Q Science > QD Chemistry
Divisions: Faculties > Science Technology and Medical Studies > School of Biosciences
Depositing User: O.O. Odanye
Date Deposited: 27 Jul 2009 18:25
Last Modified: 25 Jun 2014 13:55
Resource URI: https://kar.kent.ac.uk/id/eprint/22280 (The current URI for this page, for reference purposes)
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