Chinese Journal of Polymer Science

, Volume 30, Issue 1, pp 93–100 | Cite as

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

  • Mahnaz M. AbdiEmail author
  • H. N. M. Ekramul Mahmud
  • Luqman Chuah Abdullah
  • Anuar Kassim
  • Mohamad Zaki Ab. Rahman
  • Josephine Liew Ying Chyi


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.


Polymer composite Electron transition I–V characteristic technique Optical band gap Polypyrrole 


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Copyright information

© Chinese Chemical Society, Institute of Chemistry, Chinese Academy of Sciences and Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • Mahnaz M. Abdi
    • 1
    Email author
  • H. N. M. Ekramul Mahmud
    • 2
  • Luqman Chuah Abdullah
    • 1
  • Anuar Kassim
    • 3
  • Mohamad Zaki Ab. Rahman
    • 3
  • Josephine Liew Ying Chyi
    • 4
  1. 1.Laboratory of Biopolymer and Derivatives, Institute of Tropical Forestry and Forest Products (INTROP)Universiti Putra MalaysiaSerdang, SelangorMalaysia
  2. 2.Department of Chemistry, Faculty of ScienceUniversity of MalayaKuala LumpurMalaysia
  3. 3.Department of Chemistry, Faculty of ScienceUniversiti Putra MalaysiaSerdang, SelangorMalaysia
  4. 4.Department of Physics, Faculty of ScienceUniversiti Putra MalaysiaSerdang, SelangorMalaysia

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