Structural and electrical characterization studies for ternary composite of polypyrrole
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Structural and electrical characterization studies for ternary composite of polypyrrole R. Megha1,2, Y. T. Ravikiran1,2,* , S. C. Vijaya Kumari3, H. G. Raj Prakash4, M. Revanasiddappa5, S. Manjunatha6, Syed G. Dastager7, and S. Thomas8 1
Department of PG Studies and Research in Physics, Government Science College, Chitradurga 577 501, Karnataka, India Department of Physics, Visvesvaraya Technological University - Research Resource Centre, Belagavi 590 018, Karnataka, India 3 Department of Physics, SJM College of Arts, Science and Commerce, Chitradurga 577 501, Karnataka, India 4 Department of Physics, JNN College of Engineering, Shivamogga 577 204, Karnataka, India 5 Department of Science and Humanities, PES University, Electronic City Campus, Banglore 560100, Karnataka, India 6 Department of Physics, V V Sangha’s Independet P.U. College, Ballari 583104, Karnataka, India 7 NCIM Resource Centre, CSIR-National Chemical Laboratory, Pune 411008, Maharashtra, India 8 International and Inter University Centre for Nanoscience and Nanotechnology, Mahatma Gandhi University, Kottayam 686 560, Kerala, India 2
Received: 6 May 2020
ABSTRACT
Accepted: 31 August 2020
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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https://doi.org/10.1007/s10854-020-04386-4
J Mater Sci: Mater Electron
1 Introduction The electrical, mechanical and chemical properties of conducting polymers such as polyaniline (PANI) and polypyrrole (PPy) have been explored by many scientists mainly bec
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