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Structural and electrical characterization studies for ternary composite of polypyrrole

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Abstract

In this work, temperature dependence of alternate current (AC) and direct current (DC) conductivities of optimized polypyrrole/silver-tantalum oxide (PPy/Ag–Ta2O5), a ternary conducting polymer composite is comparatively studied with those of PPy and PPy/Ag. For the purpose, silver (Ag) nanoparticles were encapsulated with polypyrrole (PPy) by in situ oxidative polymerization to form core–shell structured PPy/Ag composite for which Ag nanoparticles were extracted from green tea. The PPy/Ag composite was then mechanically mixed with tantalum pentoxide (Ta2O5) to form PPy/Ag-Ta2O5 ternary composite. Increase in depth of delocalization band of PPy in ternary composite as compared to those of PPy/Ag composite and PPy, indicating its increased AC conductivity confirmed from the comparative FTIR analyses. Interaction between PPy/Ag composite and Ta2O5 in the ternary composite was confirmed from XRD studies. The formation of core–shell structured PPy/Ag composite and Ta2O5 particles embedded in such PPy/Ag composite to form PPy/Ag–Ta2O5 ternary composite confirmed from TEM and Raman studies. The frequency- and temperature-dependent electrical conductivity studies revealed increase in AC conductivity of the ternary composite as compared to those of PPy/Ag composite and pure PPy attributed mainly to interfacial effects. The charge transport in these samples predicted to be due to correlated barrier hopping of charges was confirmed by calculating their respective AC and DC activation energies.

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Acknowledgements

The authors are thankful to the University Grants Commission, New Delhi, for granting the financial support under major research project (41-917/2012 (SR) dated: 23/07/2012). This paper is a collaborative effort between Government Science College, Chitradurga and Mahatma Gandhi University, Kottayam-686 560, India. The authors also acknowledge Visvesvaraya Technological University – Research Resource Centre, Belagavi 590 018, Karnataka, India for their support and encouragement in carrying out research activities.

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Authors and Affiliations

  1. Department of PG Studies and Research in Physics, Government Science College, Chitradurga, 577 501, Karnataka, India

    R. Megha & Y. T. Ravikiran

  2. Department of Physics, Visvesvaraya Technological University - Research Resource Centre, Belagavi, 590 018, Karnataka, India

    R. Megha & Y. T. Ravikiran

  3. Department of Physics, SJM College of Arts, Science and Commerce, Chitradurga, 577 501, Karnataka, India

    S. C. Vijaya Kumari

  4. Department of Physics, JNN College of Engineering, Shivamogga, 577 204, Karnataka, India

    H. G. Raj Prakash

  5. Department of Science and Humanities, PES University, Electronic City Campus, Banglore, 560100, Karnataka, India

    M. Revanasiddappa

  6. Department of Physics, V V Sangha’s Independet P.U. College, Ballari, 583104, Karnataka, India

    S. Manjunatha

  7. NCIM Resource Centre, CSIR-National Chemical Laboratory, Pune, 411008, Maharashtra, India

    Syed G. Dastager

  8. International and Inter University Centre for Nanoscience and Nanotechnology, Mahatma Gandhi University, Kottayam, 686 560, Kerala, India

    S. Thomas

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Megha, R., Ravikiran, Y.T., Kumari, S.C.V. et al. Structural and electrical characterization studies for ternary composite of polypyrrole. J Mater Sci: Mater Electron 31, 18400–18411 (2020). https://doi.org/10.1007/s10854-020-04386-4

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