Magnetic, electrical and gas sensing properties of poly( o -phenylenediamine)/MnCoFe 2 O 4 nanocomposites
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Magnetic, electrical and gas sensing properties of poly(o‑phenylenediamine)/MnCoFe2O4 nanocomposites Nagarajan Kannapiran1 · Athianna Muthusamy2 · B. Renganathan3 · A. R. Ganesan3 · Sher Singh Meena4 Received: 27 June 2020 / Accepted: 9 November 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract A series of poly(o-phenylenediamine)/MnCoFe2O4 nanocomposites containing varying concentrations of MnCoFe2O4 were synthesized by in situ oxidative polymerization method. These nanocomposites were characterized by thermal, spectroscopic, microscopic techniques and dielectric properties analyzed at different temperature and frequency. X-ray diffraction and Fourier-transform infrared spectra are confirming the formation of poly(o-phenylenediamine)/MnCoFe2O4 nanocomposites. The Mössbauer spectral data are indicating the inverse nature of MnCoFe2O4 nanoparticles. The ferromagnetic behavior of nanocomposites is ascertained with the hysteresis loops of M nCoFe2O4. Transmission electron microscopy results are giving good evidences for the deposition of MnCoFe2O4 nanoparticles on the poly(o-phenylenediamine) matrix and the modification of spherical morphology of poly(o-phenylenediamine) by M nCoFe2O4. The thermal stability of poly(ophenylenediamine)/MnCoFe2O4 nanocomposites is increasing with increase in the concentration of M nCoFe2O4 nanoparticles. Dielectric constant and AC conductivity of nanocomposites are varying with applied frequency, temperature and concentration of M nCoFe2O4 nanoparticles. The ethanol gas sensing ability of M nCoFe2O4 has been improved by poly(ophenylenediamine) matrix. Keywords MnCoFe2O4 · Dielectric constant · AC conductivity · Ethanol gas sensing
1 Introduction In the past decades, huge numbers of researchers have focused their attention on magnetic polymer nanocomposites because of their easy synthesis, tunable properties, flexibility and exceptional applications [1]. The composites made by the incorporation of magnetic materials into conducting polymer matrix enhancing the magnetic, chemical, structural and electric properties and are called as magneto-polymeric materials [2]. The miniaturizations of electric and electronic * Athianna Muthusamy [email protected] 1
Department of Chemistry, Karpagam Academy of Higher Education, Coimbatore 641021, Tamil Nadu, India
2
PG and Research Department of Chemistry, Sri Ramakrishna Mission Vidyalaya College of Arts and Science, Coimbatore 641020, Tamil Nadu, India
3
Department of Physics, Indian Institute of Technology Madras, Chennai 600036, India
4
Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
instruments like mobile phone and portable computers need materials with high dielectric constant [3]. The crystalline size influences the properties of magneto-polymeric nanocomposites such as catalytic effects, drug delivery, electrical and magnetic behavior [4–6]. Generally, the conducting polymers have many attractive properties such as high mechanical strength, light weight
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