Dielectric Properties of PMMA Films Reinforced with Ag/rGO Hybrid Composites
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https://doi.org/10.1007/s11664-020-08321-5 2020 The Minerals, Metals & Materials Society
Dielectric Properties of PMMA Films Reinforced with Ag/rGO Hybrid Composites PRIYA PARVATHI AMEENA JOSE,1 M.S. KALA ,1,3 NANDAKUMAR KALARIKKAL,2 and SABU THOMAS2 1.—Department of Physics, St. Teresa’s College, Ernakulam, Kerala, India. 2.—International and Inter University Centre for Nanoscience and Nanotechnology, MG University, Kottayam, Kerala, India. 3.—e-mail: [email protected]
Nanocomposite materials consisting of polymer matrices and nano-sized fillers have fascinated scientists with their superior functional properties, attained at relatively low filler loading. In this work, nanocomposite films of poly(methyl methacrylate) (PMMA)-reinforced with different concentrations of partially reduced graphene oxide/silver (rGO/Ag) hybrid were prepared in two different solvents following an ex situ chemical method. By employing solvent casting, all the samples were prepared as free-standing films. The structural and morphological characterisations of a GO/Ag hybrid and the as-prepared film samples were done with different tools such as x-ray diffraction (XRD), UV–Vis absorption spectroscopy, Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy and electron microscopy (SEM and TEM). Chemical microanalysis of the nanohybrid was carried out by energy-dispersive x-ray (EDX) spectroscopy. Dielectric properties of these films have been carried out at room temperature in the frequency range of 100 Hz–2 MHz using an LCR meter, and these films show considerable changes in their properties when loaded with GO/Ag hybrid nanocomposites. The filler and solvent-dependent properties shown by the free-standing films make them a promising candidate for the fabrication of flexible energy storage devices. Key words: PMMA films, rGO/Ag hybrids, real part of permittivity, imaginary part of permittivity, ac conductivity
INTRODUCTION Polymer composite materials reinforced with different fillers have drawn substantial attention from industry owing to their tunable properties. One of the most characteristic features of these composites is that their properties can be widely changed by choice of shape, size, and tacticity of the filler constituents in the polymeric matrix.1 The incorporation of the nanofillers improves the mechanical stability and structural integrity of the polymer matrix.2,3 Even a small amount of nanofiller loading improves the property of the matrix by several
(Received December 2, 2019; accepted July 8, 2020)
orders of magnitude beyond that of traditional composites.4–6 All these properties enhance their performance in various fields. Presently, the demand is for developing polymer thin films of these composite materials with good conducting and dielectric properties which finds applications in different fields such as magneto-optic data storage, energy storage devices, integrated capacitors, optical fibres, biosensors and nonlinear optical switches.7,8 Among the conductive fillers, there have been several rep
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