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      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/034/07/1557-1561

    • Keywords

       

      Conducting polymers; conductivity; polarons; polyaniline composites, 𝛾-Fe2O3.

    • Abstract

       

      Conducting polyaniline/𝛾-Fe2O3 (PANI/FE) composites have been synthesized using an in situ deposition technique by placing fine-graded 𝛾-Fe2O3 in a polymerization mixture of aniline. The composites are characterized by using scanning electron microscopy (SEM), X-ray diffraction (XRD) and infrared (IR) spectroscopy. The electrical properties such as d.c. and a.c. conductivities are studied by sandwitching the pellets of these composites between the silver electrodes. It is observed that the conductivity increases up to a composition of 20 wt.% of 𝛾-Fe2O3 in polyaniline and decreases thereafter. The initial increase in conductivity is attributed to the extended chain length of polyaniline, where polarons possess sufficient energy to hop between favourable sites. Beyond 20 wt.% of 𝛾-Fe2O3 in polyaniline, the blocking of charge carrier hop occurs, reducing conductivity values. The magnetic properties such as hysteresis characteristics and normalized a.c. susceptibility are also measured, which show a strong dependence on content of 𝛾-Fe2O3 in polyaniline. Because of superparamagnetic behaviour of these composites, they may find extensive technological applications, especially for absorbing and shielding applications in microwave frequencies.

    • Author Affiliations

       

      Syed Khasim1 S C Raghavendra2 M Revanasiddappa3 K C Sajjan4 Mohana Lakshmi1 Muhammad Faisal1

      1. Department of Physics, PES School of Engineering, Bangalore 560 100
      2. Department of E&CE, PES School of Engineering, Bangalore 560 100
      3. Department of Chemistry, PES School of Engineering, Bangalore 560 100
      4. Department of Physics, Veerasaiva College, Bellary 583 101, India

    • Dates

       
      Published
      December 2011
      Manuscript received
      4 August 2009
      Manuscript revised
      10 November 2010

  • Bulletin of Materials Science | News

    • Dr Shanti Swarup Bhatnagar for Science and Technology

      Posted on October 12, 2020

      Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
      Chemical Sciences 2020

      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
      Physical Sciences 2020

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

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