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Thermochromic effect in synthetic opal/polyaniline composite structures

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Abstract

The design and construction of a novel storage/indicator bilayer system is described where ammonia gas stored in a porous material can be used to dope a colour-changing polyaniline film. Both reversible and irreversible colour change effects are possible. A thin synthetic opal film is coupled to a polyaniline film in a parallel plate glass cell with ammonia gas adsorbed on the silica balls that form the opal structure. When heated and cooled, ammonia reversibly exchanges between the opal and polyaniline films causing a very distinct change in the colour of the polyaniline film. This thermochromic effect is also electrically detectable because of the large concomitant change in the resistivity of the polyaniline film that accompanies its colour change.

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Authors and Affiliations

  1. Department of Electronics and Electrical Engineering, University of Glasgow, Rankine Building, Oakfield Avenue, Glasgow, G12 8LT, UK

    F. Rahman & A. Z. Khokhar

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  1. F. Rahman
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  2. A. Z. Khokhar
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Correspondence to F. Rahman.

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Rahman, F., Khokhar, A.Z. Thermochromic effect in synthetic opal/polyaniline composite structures. Appl. Phys. A 94, 405–410 (2009). https://doi.org/10.1007/s00339-008-4822-6

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  • DOI: https://doi.org/10.1007/s00339-008-4822-6

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