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Open AccessArticle

Dielectric Relaxation Behavior of Silver Nanoparticles and Graphene Oxide Embedded Poly(vinyl alcohol) Nanocomposite Film: An Effect of Ionic Liquid and Temperature

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School of Applied Sciences (Chemistry), Kalinga Institute of Industrial Technology, Bhubaneswar, Odisha 751024, India
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Department of Chemistry, Prof. Rajendra Singh (Rajju Bhaiya) Institute of Physical Sciences for study and Research, V.B.S. Purvanchal University Jaunpur, Jaunpur 222003 U.P., India
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Department of Chemical and Materials Engineering, Chang Gung University, Taoyuan 333, Taiwan
*
Authors to whom correspondence should be addressed.
Polymers 2020, 12(2), 374; https://doi.org/10.3390/polym12020374
Received: 20 December 2019 / Revised: 31 January 2020 / Accepted: 2 February 2020 / Published: 7 February 2020
(This article belongs to the Special Issue Carbon Materials Modified Polymeric Composites)
This paper presents the dielectric characteristics of nanocomposite films of poly(vinyl alcohol) (PVA) embedded with silver (Ag) nanoparticles and graphene oxide(GO). The nanocomposite films were fabricated by using the solvent casting approach. The morphological analysis was carried out through scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The dielectric relaxation behavior of nanocomposite films was analyzed in the frequency range of 101 to 106 Hz, by varying GO loading. The temperature effect was investigated over the temperature range of 40 to 150 °C. The effect of ionic liquid (IL) was also explored by comparing the dielectric behavior of films fabricated without using ionic liquid. The conductive filler loading variation showed a significant effect on dielectric permittivity(ε’), complex impedance (Z*) and electric conductivity (σac). The obtained results revealed that the dielectric permittivity (ε’) increased by incorporating Ag nanoparticles and increasing GO loading in PVA matrix. An incremental trend in dielectric permittivity was observed on increasing the temperature, which is attributed to tunneling and hopping mechanism. With an increase in nanofiller loading, the real part of impedance (Z’) and imaginary part of impedance (Z’’) were found to decrease. Further, the semicircular nature of Nyquist plot indicated the decrease in bulk resistivity on increasing GO loading, temperature and incorporating ionic liquid. On the basis of above findings, the obtained GO-Ag-PVA nanocomposite films can find promising applications in charge storage devices.
Keywords: dielectric permittivity; graphene oxide; poly(vinyl alcohol); polymer nanocomposite dielectric permittivity; graphene oxide; poly(vinyl alcohol); polymer nanocomposite
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MDPI and ACS Style

Sahu, G.; Das, M.; Yadav, M.; Sahoo, B.P.; Tripathy, J. Dielectric Relaxation Behavior of Silver Nanoparticles and Graphene Oxide Embedded Poly(vinyl alcohol) Nanocomposite Film: An Effect of Ionic Liquid and Temperature. Polymers 2020, 12, 374.

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