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Analysis of DC and AC properties of a humidity sensor based on polyaniline–chromium oxide composites

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Abstract

Polyaniline–Chromia (PANI–Cr2O3) composites were synthesized by in situ polymerization. The prepared composites were characterized by scanning electron microscopy, X-ray diffraction and Fourier transforms infrared spectroscopy. The structural studies confirm the polymerization of aniline over Cr2O3 particles which results into strong interaction between PANI and Cr2O3 particles. Direct current conductivity of composites increases with increase in temperature. Among all composites, 30 wt% shows high conductivity. The humidity sensing mechanism of the PANI–Cr2O3 composites is studied and change in its resistance with respect to percentage relative humidity ranging from 20 to 95 % is recorded. The humidity sensing studies shows that the change in the resistance is due to the uncurling of polymer chains by the absorption of water vapor which leads to increase in conduction paths. The results indicate better humidity sensing response by the addition of Cr2O3 particles to PANI, among all the composites, 30 wt% composite shows higher sensitivity.

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Acknowledgments

K. C. Sajjan would like to thank management of Veerashaiva College, Bellary for their support in research activities. The authors would like to thank the management of PES Institute of Technology-Bangalore South Campus for providing the research facility to carry out this research work.

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Authors and Affiliations

  1. Department of Physics, Veerashaiva College, Bellary, 583104, India

    K. C. Sajjan

  2. Department of Materials Science, Gulbarga University, Gulbarga, 585106, Karnataka, India

    Aashis S. Roy

  3. Department of Physics, Government First Grade College, Guirmetkal, 585124, India

    Ameena Parveen

  4. Department of Physics, University of Tabuk, Tabuk, 71491, Kingdom of Saudi Arabia

    Syed Khasim

  5. Department of Physics, PES Institute of Technology, Bangalore South Campus, Bangalore, 560100, India

    Syed Khasim

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  1. K. C. Sajjan
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  2. Aashis S. Roy
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  3. Ameena Parveen
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  4. Syed Khasim
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Correspondence to Syed Khasim.

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Sajjan, K.C., Roy, A.S., Parveen, A. et al. Analysis of DC and AC properties of a humidity sensor based on polyaniline–chromium oxide composites. J Mater Sci: Mater Electron 25, 1237–1243 (2014). https://doi.org/10.1007/s10854-014-1715-7

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  • DOI: https://doi.org/10.1007/s10854-014-1715-7

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