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Jayanthi S.,Center for Research and Post Graduate Studies in Physics | Sundaresan B.,Center for Research and Post Graduate Studies in Physics
Ionics | Year: 2014

Nanocomposite polymer blend electrolytes composed of PEO-P(VdF-HFP)-LiClO4 were prepared for various concentrations of TiO2 nanofiller. All the composite electrolytes were subjected to ultrasonic irradiation for enhancing the ionic conductivity of the composite electrolytes. It was noted that the ultrasonic irradiated samples exhibited a higher ionic conductivity than the non-radiated samples. In addition, filler concentration in the complex was also optimized based on ionic conductivity, and it was noted that the sample containing 6 wt% showed maximum value about 1.451 × 10-5 S cm-1; however, this is lower than the value obtained from the irradiated samples (2.27 × 10-4 S cm-1). The dielectric, modulus and tangent loss behaviour of the samples were also estimated and discussed. Thermal and surface images studies were also carried out using TG/DTA and AFM studies, respectively. In addition, mobility and diffusion coefficient characteristics were also evaluated. © 2014 Springer-Verlag Berlin Heidelberg. Source


Jayanthi S.,Kalasalingam University | Arulsankar A.,Center for Research and Post Graduate Studies in Physics | Sundaresan B.,Center for Research and Post Graduate Studies in Physics
Applied Physics A: Materials Science and Processing | Year: 2016

In the present work, PEO:P(VdF-HFP) polymer blend was prepared. The blend was complexed with lithium perchlorate (LiClO4), and nanosized strontium titanate (70.60 nm) SrTiO3 particles were dispersed into the complex in different weight ratios. Acetonitrile was used as solvent. The nanocomposite polymer blend electrolytes (NCPBEs) were prepared by the solvent-casting technique. Ionic conductivity of polymer blend electrolyte, PEO:P(VdF-HFP):LiClO4, was found to enhance at room temperature by the addition of nanoSrTiO3, and it was further confirmed through PL studies. Two ionic conductivity maxima, one at 2 wt% and another at 6 wt% of SrTiO3 were observed for NCPBEs. Out of the two peak maxima, the maximum ionic conductivity, 4.827 × 10−5 S cm−1, was obtained for 2 wt% SrTiO3. This is attributed to the increase in amorphicity of the polymer blend electrolytes, resulting from the polymer–salt–filler interactions. The crystalline and amorphous phases of the complex were identified through X-ray diffraction. The dielectric behavior was analyzed using complex dielectric permittivity (ε∗), electric modulus (M∗), and loss tangent. From the loss tangent spectra, relaxation times were evaluated, and the relaxation is found to be consistent with the conductivity of the samples. AFM and SEM analyses revealed significant changes in the surface morphology, which is in accordance with the ionic conductivity of the samples. The thermal stability was ascertained through TG/DTA studies. © 2016, Springer-Verlag Berlin Heidelberg. Source


Jeya S.,Center for Research and Post Graduate Studies in Physics | Jayanthi S.,Center for Research and Post Graduate Studies in Physics | Arulssankar A.,Center for Research and Post Graduate Studies in Physics | Sundaresan B.,Center for Research and Post Graduate Studies in Physics
International Journal of ChemTech Research | Year: 2014

Ionic liquid incorporated solid polymer electrolyte was prepared with an aim to achieve good ionic conductivity for the application of batteries, sensors and actutators. The solid polymer electrolyte prepared by solution casting technique comprises a solution of sodium trifluoromethane sulfonate(NaTf) in a room temperature ionic liquid 1-methyl-3-propylimidazolium iodide (MPII) immobilized in poly (vinylidinefluoride-hexfluoropropylene (PVdF-HFP). Different structural and electrical studies demonstrate promising characteristics of the polymer electrolyte films suitable as electrolyte in rechargeable sodium batteries. Fourier Transform Infra-red (FTIR) and X-ray diffraction techniques indicate possible conformational/structural changes in the polymer (PVdF-HFP) due to the addition of MPII and MPII-NaTf. The content of IL was found to affect the ionic conductivity and the maximum ionic conductivity value of 1.377×10−3 S cm−1 was achieved for (40wt %) of IL. The temperature dependence of electrical conductivity of the sample exhibit the metallic behaviour of the sample. © 2014, Sphinx Knowledge House. All rights Reserved. Source


Jayanthi S.,Center for Research and Post Graduate Studies in Physics | Arulsankar A.,Center for Research and Post Graduate Studies in Physics | Kokila G.P.,Center for Research and Post Graduate Studies in Physics | Banulakshmi S.,Center for Research and Post Graduate Studies in Physics | Sundaresan B.,Center for Research and Post Graduate Studies in Physics
International Journal of ChemTech Research | Year: 2014

Nanocomposite polymer electrolytes (NCPEs) composed of poly(ethyl methacrylate) (PEMA) as a host polymer, potassium thiocyanate (KSCN) as a doping salt and strontium titanate (SrTiO3) (70.60 nm) as filler were prepared for different concentrations for SrTiO3 using solvent casting technique. The prepared samples were subjected to AC impedance spectroscopy, Fourier transform infrared (FTIR) and X-ray diffraction (XRD) studies. AC impedance analyses of the prepared samples were carried out in the frequency range of 1 Hz – 10 MHz. It was found that the value of ionic conductivity was enhanced due to the addition of nano SrTiO3. A maximum ionic conductivity of 3.072 × 10−5 Scm−1 was achieved for the addition of 4 wt% of SrTiO3, whereas the value of ionic conductivity was 9.960 x 10−7 Scm−1 for filler free system at room temperature. This increase in ionic conductivity is due to the increase in the amorphous nature of the prepared NCPEs. XRD and FTIR studies revealed the structural and complex formation between the constituents involved. © 2014, Sphinx Knowledge House. All rights reserved. Source

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