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Effects of anhydrous AlCl3 dopant on the structural, optical and electrical properties of PVA–PVP polymer composite films

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Abstract

Polymer composite films based on PVA–PVP with AlCl3 as the dopant at different concentrations were prepared using solution casting technique. XRD patterns reveal the increase in amorphousity of the films with AlCl3 doping. Optical absorption studies exhibit that the values of optical absorption coefficient, direct and indirect optical band gaps are found to decrease with increase in AlCl3 concentration. It confirms the charge transfer in complexes between the polymer and the dopant. The dielectric studies show the increase in dielectric constant at low frequency with increasing AlCl3 concentration and temperature. The ac conductivity and ionic conductivity increase with the AlCl3 content and the maximum value at room temperature is found to be 6.89 × 10−4 and 8.05 × 10−5 S/cm for higher AlCl3 doped PVA–PVP film. The estimated ionic conductivity value is three or four orders of magnitude greater than those obtained in the certain representative polymer-salt complexes as reported earlier. Electrical modulus plots confirm the removal of electrode polarization and the low conductivity relaxation time with Al doping. The activation energy estimated from the temperature dependent dc conductivity plot is agreed well with the migration energy calculated from the temperature dependent electric modulus plot.

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Acknowledgements

The authors gratefully acknowledge the financial support from University Grants Commission (UGC), New Delhi, India, to undertake this work (Grant No. F.39-494/2010 (SR)).

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Authors and Affiliations

  1. Department of Physics, Vel Tech, Chennai, Tamilnadu, 600 062, India

    G. Shanmugam

  2. Advanced Materials Laboratory, Department of Physics, Periyar University, Salem, Tamilnadu, 636 011, India

    V. Krishnakumar

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  1. G. Shanmugam
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  2. V. Krishnakumar
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Correspondence to G. Shanmugam.

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Shanmugam, G., Krishnakumar, V. Effects of anhydrous AlCl3 dopant on the structural, optical and electrical properties of PVA–PVP polymer composite films. Indian J Phys 92, 605–613 (2018). https://doi.org/10.1007/s12648-017-1140-x

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  • DOI: https://doi.org/10.1007/s12648-017-1140-x

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