Crowned and Liquid-Crystalline Phthalocyanines as Gas-Sensor Materials

Wright, John D. and Roisin, Philippe and Rigby, G. Patricia and Nolte, Roeland J.M. and Cook, M.J. and Thorpe, Stephen C. (1993) Crowned and Liquid-Crystalline Phthalocyanines as Gas-Sensor Materials. Sensors and Actuators B: Chemical, 13 (1-3). pp. 276-280. ISSN 0925-4005. (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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Semiconducting films of crown-ether substituted metal-free phthalocyanines are shown to have unique properties of fast response and reversal to NO2 at room temperature. Increasing the size of the crown ring or complexing the phthalocyanine with Cu(II) gives slower responses. Complexing the crown-ether rings with simple metal salts leads to very rapid reversible conductivity decreases in 1-5 ppm NO2 at room temperature. Discotic liquid-crystal phases of octaoctyl phthalocyanine also respond rapidly and reversibly to NO2. The origins of these effects are discussed with reference to reduced local polarizability, increased molecular separation and improved molecular assembly, and experiments exploring the influence of molecular design and crystal engineering on these sensing properties are described.

Item Type: Article
Subjects: Q Science > QD Chemistry
T Technology > TA Engineering (General). Civil engineering (General) > TA166 Instrumentation
Divisions: Faculties > Science Technology and Medical Studies > School of Biosciences
Depositing User: O.O. Odanye
Date Deposited: 13 Jul 2009 17:54
Last Modified: 18 Jul 2014 10:12
Resource URI: (The current URI for this page, for reference purposes)
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