Browsing by Author "Gupta, Prem Narain"

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    Effect of ZnO nanoparticles in 70:30 PVA:LiI polymer electrolyte films
    (American Scientific Publishers, 2016) Kulshrestha, Niharika; Chatterjee, Bhaskar; Gupta, Prem Narain
    ZnO nanoparticles are prepared by the polymer precursor method using zinc oxide, polyethylene glycol and citric acid. Solution cast technique is used to prepare polymer electrolyte films having 70:30 weight ratio of the polyvinyl alcohol and lithium iodide salt incorporating 0, 1 and 2 wt% of ZnO nanoparticles. X-ray diffraction (XRD) pattern indicates that crystallinity of the polymer electrolyte films increases with the dispersal of ZnO nanoparticles in the polymer matrix. Vibrational changes in the nanocomposite polymer electrolyte films are shown by Fourier Transform Infra-Red (FTIR) Spectroscopy. The highest ionic conductivity is found to be ∼3_5×10−5 S/cm at room temperature for 70:30 PVA:LiI polymer electrolyte films. Ionic conductivity is found to be decreased with increasing amount of ZnO nanoparticles. Dielectric properties of the polymer electrolyte films are observed with varying ZnO nanoparticles in the polymer electrolyte films. Enhancement in the relaxation time and reduction in the dielectric loss are monitored with increase in the crystallinity of the polymer electrolyte films. © 2016 American Scientific Publishers All rights reserved.
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    ItemProject Report
    Preparation and characterization of nano-composite polymer electrolytes for device applications
    (Department of Physics, 2015) Gupta, Prem Narain
    Different series of new Polymer electrolytes have been prepared using solution casting technique. Investigation of prepared films have been made using various experimental techniques like X-ray diffraction (XRD), Attenuated total reflection–fourier transform infrared (ATR-FTIR), Thermo-gravimetric analysis (TGA), Differential scanning calorimetric (DSC), AC impedance spectroscopy. AC conductivity spectra, temperature dependent dc conductivity, dielectric properties, electrical modulus and mobility, total number of charge carrier density has been studied.