Abstract
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.
Highlights
IntroductionNanocomposites play an important role in the technological advancement of the 21st century
Nanocomposites play an important role in the technological advancement of the 21st century.Nanocomposite is a multiphase material made up of matrix phase and the reinforcing phase, having enhanced thermal, mechanical, electrical, optical properties, as compared to individual phases.Due to the versatile nature of nanocomposites, they find numerous potential applications in various fields. [1,2,3,4]
Multifunctional hybrid polymer nanocomposites based on poly(vinyl alcohol) (PVA)-Ag-Graphene Oxide (GO) were successfully fabricated by using solvent casting technique
Summary
Nanocomposites play an important role in the technological advancement of the 21st century. Graphene and graphene derivatives have been extensively used for making the novel polymer nanocomposites, which have advanced one step ahead of the use of other conventional carbon nanofillers like carbon black and carbon nanotubes, due to their ultra-high aspect ratio, low density with excellent mechanical and dielectric properties, and find applications in energy storage devices [15,16]. Compared to the carbon nanotubes, graphene is relatively cheaper due to its easy synthesis process It exhibits a high level of electrical conductivity, extremely high carrier mobility and highly thermal conductivity with superior mechanical properties [17]. Graphene-based polymer nanocomposites exhibit outstanding mechanical and dielectric properties compared to other nanofillers [18,19,20]. One of the methods of improving the dispersion of carbon based nanofillers in a polymeric matrix is by using suitable ionic liquids (IL). The effect of ionic liquid and temperature have been explored on ε0 , Z0 , Z”, σac and the Nyquist plot of the nanocomposite films
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