Chitosan – Graphite – Maghemite – a Flexible, Superparamagnetic Nanocomposite Comprising of Microcapacitors

Document Type : Original Article


1 Department of Physics, Bharath Institute of Higher Education and Research, Chennai - 600 073

2 Department of Physics Anna University, CEG Campus, Chennai - 600 025


In this work, an eco-friendly “green” nanocomposite of chitosan containing graphite and maghemite (g-Fe2O3) nanoparticles were prepared by solution casting method. The effect of g-Fe2O3 nanoparticles on structural, electric and dielectric properties of Chitosan-graphite (Cs-graphite) composites was investigated. The dielectric constant of Cs-graphite composites increased with incorporation of g-Fe2O3 nanoparticles. Among the composites Cs-20% graphite - 20% g-Fe2O3 has dielectric constant of ~16.5 at 1 MHz at room temperature. With increase in temperature the dielectric constant varied significantly. The conductivity of Cs-graphite is enhanced by one order of magnitude with addition of g-Fe2O3 nanoparticles, and the value is found to be 5.7x10-6 S/cm. Various parameters such as dielectric constant, dielectric loss, electric modulus, conductivity, activation energy were analyzed. Magnetic measurement of g-Fe2O3 nanoparticles and the PNCs showed superparamagnetic behaviour. A model is proposed to explain the observed dielectric behavior of polymer nanocomposites (PNCs). The formation of microcapacitors by incorporation of maghemite nanoparticles between graphite is proposed.


Main Subjects

© 2023 The Author(s). Journal of Progress in Physics of Applied Materials published by Semnan University Press. This is an open access article under the CC-BY 4.0 license. (

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Volume 3, Issue 1 - Serial Number 4
(In honor of 80th birthday of Prof. P. Ramasamy)
November 2023
Pages 83-103
  • Receive Date: 30 August 2023
  • Revise Date: 11 October 2023
  • Accept Date: 16 October 2023