Complexion Formation in PVA/PEO/CuCl 2 Solid Polymer Electrolyte (original) (raw)
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Complexion Formation in PVA/PEO/CuCl2 Solid Polymer Electrolyte
Universal Journal of Materials Science, 2015
Solid polymer electrolyte films based on polymer blends of poly(vinyl alcohol) (PVA) and poly(ethylene oxide) (PEO), with different concentration of copper (II) chloride (CuCl 2) were prepared using casting technique. Optical studies were performed using Fourier transform infrared (FT-IR) and Ultraviolet-visible (UV-Vis) spectroscopy. The optical properties of these films were varied by varying CuCl 2 concentration. The results show the absorption edge for electrolyte samples shifts toward a lower energy region by increasing the salt concentration, leading to the band gap reduction. The band gap energy data showed that the incorporation of CuCl 2 into the polymeric system causes charge transfer complexes in the blend polymer, which lead to increase in the electrical conductivity, by providing additional charges in the lattice. The PVA/PEO/CuCl 2 solid polymer electrolyte films exhibit good UV shielding properties in the wavelength range from 190 to 400 nm.
Complexion Formation in PVA/PEO/CuCl<sub>2</sub> Solid Polymer Electrolyte
Universal journal of materials science, 2015
Solid polymer electrolyte films based on polymer blends of poly(vinyl alcohol) (PVA) and poly(ethylene oxide) (PEO), with different concentration of copper (II) chloride (CuCl 2) were prepared using casting technique. Optical studies were performed using Fourier transform infrared (FT-IR) and Ultraviolet-visible (UV-Vis) spectroscopy. The optical properties of these films were varied by varying CuCl 2 concentration. The results show the absorption edge for electrolyte samples shifts toward a lower energy region by increasing the salt concentration, leading to the band gap reduction. The band gap energy data showed that the incorporation of CuCl 2 into the polymeric system causes charge transfer complexes in the blend polymer, which lead to increase in the electrical conductivity, by providing additional charges in the lattice. The PVA/PEO/CuCl 2 solid polymer electrolyte films exhibit good UV shielding properties in the wavelength range from 190 to 400 nm.
Evolution of the optical properties of PVA film filled with CuCl
journal of garmian university
Polyvinyl alcohol (PVA) has been doped by different percentage of Copper Chloride (CuCl), films for different weight ratio (0, 1, 1.5, and 2%) were prepared by the well-known solution cast method. The optical properties were obtained in the wavelength range (190-1100) nm. Results show that for the pure PVA films the optical constants were increased after doping and with increasing impurity concentration. For indirect allowed transition the optical energy gap decreases from 4.6 eV (for pure PVA) to 3.8 eV (for PVA+2%CuCl). The results show the absorption edge for electrolyte samples moves toward a lower energy region by increasing the salt concentration, leading to the band gap reduction. This study shows that the optical properties of PVA are affected by salt concentration.
Studies on Optical Properties of Pva Based Complex Polymer Electrolyte
Rasayan Journal of Chemistry, 2021
Solid Polymer Electrolytes (SPE) based on polymer (PVA) Polyvinyl Alcohol is doped with Sodium Nitrate (NaNO3), a membrane is prepared by solution casting method. Here outcomes of the optical transmission, optical absorption, optical absorption coefficient, optical refractive index, optical extinction coefficient, direct energy band gaps, indirect energy bandgap, absorption edge, estimated band gap, optical conductance studies are given. Optical properties are taken by UV-visible (Ultraviolet-visible) Absorption spectroscopy wavelength within the range of 200 nm to 800 nm. optical transmittance wavelength is 200 nm. Energy band gap changes from 5.6eV to 4.9eV. Indirect, direct and absorption edge is high for polymer pure PVA. By increasing the salt concentration to the polymer the abovementioned parameters are decreasing gradually. For the concentration of 70% PVA: 30% NaNO3 has a low value of direct and indirect energy bandgap.
Journal of Research Updates in Polymer Science, , 2014
Solution-casting technique was employed for the preparation of solid polymer electrolyte based polyethylene oxide (PEO) with 0, 1, 3 and 5 weight percentage cobalt chloride (CoCl2) films were characterized by X-ray Diffractometry (XRD), Differrential Scanning Calorimetry (DSC), Scanning Electron Microscope (SEM) and Ultra Violet-Visible (UV-Vis.) Spectroscopy methods. The optical band gaps, absorption band edges and Urbach energy shows decrease with increasing of Co +2 ion concentration in the polymer matrix because of the formation of free radicals or cluster. The Thermogravimetry (TG) and Derivative Thermogravimetry (DTG) were used to examine the thermal stability of the film and it was found that the stability of the complexes is higher than that of the pure PEO due to the addition of CoCl2. The wavelength position of a fluorescence emission band varied by increasing of a dopant wt % of salt.
Optical Properties of PVA:CdCl2.H2O Polymer Electrolytes
IOSR Journal of Applied Physics, 2013
Polymer electrolytes based on Polyvinyl alcohol-Cadmium Chloride were prepared by solution cast technique. Results of optical absorption, transmission spectra, refractive index, optical band gaps, optical conductance, single oscillator energy, dispersion energy, real and imaginary parts of dielectric constants studies are presented. The optical properties were obtained using UV-VIS Double Beam Spectrophotometer in the wavelength range (190-1100) nm. The optical transmittance at wavelength ≈ 190nm for pure PVA was nearly at 78%, while it was 50% for all doped samples. The optical transmittance was increased with increasing wavelength up to 98% for all films beyond ≈240nm. The calculated energy band gap changes from 6.42eV (pure PVA) to 5.80eV (PVA-20%CdCl 2 .H 2 O). The optical conductance and band-gap indicated that the films are almost transmitting within the visible range. The single oscillator expression has been used to obtain the information about disorder degree. The real and imaginary parts of dielectric constant of the doped films increases with increasing CdCl 2 .H 2 O concentration, and it shows decreases abruptly in the wavelength (200-220) nm, and finally becomes constant with increase in photon energy.
Studies on Solid Polymer Electrolyte Based on PEO/PVC Blends
2007
Novel polymer blend electrolyte was prepared using poly (ethylene oxide), polyvinyl chloride) and lithium perchlorate (LiCI0 4) as the complexing salt by employing solvent casting technique The prepared films were subjected to XRD, FTIR, ac impedance spectroscopy and thermogravimetry / differential thermal analysis (TQ/OTA) Quantitative analysis of the FTIR spectra provides the specific interactions between the constituents The thermal stability of the film is found using TG/DTA studies The maximum conductivity value of PVC (25)-PEO(75)~LiCI0 4 {8) film is found as 1 32 x 10 5 S/cm at room temperature As the PVC concentration increases in the electrolyte, the conductivity is found to decrease The temperature dependent ionic conductivity is also carried out in the temperature range 303-333K and the results are discussed
Electrical and Optical Properties of PVA/LiI Polymer Electrolyte Films
PVA has been doped by different percentage of Lithium Iodide (LiI), electrical and optical properties of polymer electrolytes have been investigated. At low frequency, the variation of dielectric constant and dielectric loss with frequency shows the presence of material electrode inter-face polarization processes. The exponent factor found is between 0.98 and 0.442 and obeys the universal power law. The absorption of pure and doped films have been studied in the visible and ultra-violet wavelength regions. It has been observed that the new absorption peaks at 290 and 375 nm are due to the formation of charge transfer complex. From direct allowed transition the optical energy gap decreases from 5.56 eV (for pure PVA) to 4.95 eV (for PVA+20%LiI).
2012
A novel PVA/CuI nanocomposite polymer electrolyte layer synthesized via the reduction of CuCl 2 by NaI in an aqueous PVA solution. The as-prepared films were characterized by X-ray diffraction, scanning electron microscope, as well as impedance spectroscopy. The obtained results indicated the formation of hexagonal CuI nano particles of ≈55 nm sizes embedded in the PVA matrix. In addition, the study of dielectric parameters and conductivity of PVA/CuI nanocomposite in wide range of temperature and frequency are given and discussed. The frequency dependence of ac-conductivity suggests power law with an exponent 0.026 < s < 0.73 which predicts hopping of charge carriers. The bulk conductivity showed activation with temperature, significant values of activation energy are deduced and discussed. An average value of the energy gap width, 2.05 eV obtained using optical absorption in UV-visible spectra for PVA/CuI nanocomposite polymer electrolyte.
OPTICAL PROPERTIES OF PVP BASED POLYMER ELECTROLYTE FILMS
TJPRC, 2013
Poly vinyl pyrrolidone (PVP) based polymer electrolyte films complexed with potassium chloride (KBr) salt were prepared using solution casting technique. Structural and complexation of the polymer was confirmed by X-ray diffraction (XRD) and Fourier transform infrared (FTIR) techniques .The temperature dependence of conductivity was performed using AC Impedance Analyzer in the frequency range 0.01- 100 kHz and temperature range 300- 360 K. The transference numbers were determined using Wagner Polarization technique and dominant conducting species were found to be ions rather than electrons. Optical absorption spectra were recorded at room temperature in the wavelength range 200-600 nm using Perkin Elmer UV-VIS-NIR(Model-UV-3100) spectrophotometer.