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Optical band gap and conductivity measurements of polypyrrole-chitosan composite thin films

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Abstract

Electrical conductivity and optical properties of polypyrrole-chitosan (PPy-CHI) conducting polymer composites have been investigated to determine the optical transition characteristics and energy band gap of composite films. The two electrode method and I–V characteristic technique were used to measure the conductivity of the PPy-CHI thin films, and the optical band gap was obtained from their ultraviolet absorption edges. Depending upon experimental parameter, the optical band gap (Eg) was found within 1.30–2.32 eV as estimated from optical absorption data. The band gap of the composite films decreased as the CHI content increased. The room temperature electrical conductivity of PPy-CHI thin films was found in the range of 5.84 × 10−7–15.25 × 10−7 S·cm−1 depending on the chitosan content. The thermogravimetry analysis (TGA) showed that the CHI can improve the thermal stability of PPy-CHI composite films.

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Authors and Affiliations

  1. Laboratory of Biopolymer and Derivatives, Institute of Tropical Forestry and Forest Products (INTROP), Universiti Putra Malaysia, 43400, Serdang, Selangor, Malaysia

    Mahnaz M. Abdi & Luqman Chuah Abdullah

  2. Department of Chemistry, Faculty of Science, University of Malaya, 50603, Kuala Lumpur, Malaysia

    H. N. M. Ekramul Mahmud

  3. Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, 43400, Serdang, Selangor, Malaysia

    Anuar Kassim & Mohamad Zaki Ab. Rahman

  4. Department of Physics, Faculty of Science, Universiti Putra Malaysia, 43400, Serdang, Selangor, Malaysia

    Josephine Liew Ying Chyi

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  1. Mahnaz M. Abdi
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  2. H. N. M. Ekramul Mahmud
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  3. Luqman Chuah Abdullah
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  4. Anuar Kassim
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  5. Mohamad Zaki Ab. Rahman
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  6. Josephine Liew Ying Chyi
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Correspondence to Mahnaz M. Abdi.

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Abdi, M.M., Ekramul Mahmud, H.N.M., Abdullah, L.C. et al. Optical band gap and conductivity measurements of polypyrrole-chitosan composite thin films. Chin J Polym Sci 30, 93–100 (2012). https://doi.org/10.1007/s10118-012-1093-7

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  • DOI: https://doi.org/10.1007/s10118-012-1093-7

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