Optical and Electrical Properties of Pure and Doped PEO Polymer Electrolyte Films

A sodium ion conducting polymer electrolyte based on polyethylene oxide (PEO) complexed with NaFeF 4 was prepared using solution cast technique. The complexation of the salt with PEO was confirmed by X-ray diffraction (XRD) and infared spectroscopic (FTIR) studies. Optical absorption studies were ma...

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Bibliographic Details
Published in:Soft materials 2007-01, Vol.5 (1), p.33-46
Main Authors: Mohan, V. M., Bhargav, P. B., Raja, V., Sharma, A. K., Narasimha Rao, V. V. R.
Format: Article
Language:English
Subjects:
Electrical conductivity
FTIR
Ion Transference numbers
Optical absorption
Optical band gaps
Polymer electrolyte
XRD
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Summary:A sodium ion conducting polymer electrolyte based on polyethylene oxide (PEO) complexed with NaFeF 4 was prepared using solution cast technique. The complexation of the salt with PEO was confirmed by X-ray diffraction (XRD) and infared spectroscopic (FTIR) studies. Optical absorption studies were made in the wavelength range 200-600 nm on pure and NaFeF 4 doped PEO film. The absorption edge was observed at 4.62 eV for undoped PEO while it ranged from 3.86 to 3.61 eV for NaFeF 4 doped films. The direct band gaps for undoped and NaLaF 4 doped PEO films were found to be, respectively, 4.54 and 3.74, 3.63 and 3.54 eV while the indirect band gaps were 4.43 and 3.52, 3.38 and 3.26 eV, respectively. It was found that the energy gaps and band edge values shifted to lower energies on doping with NaFeF 4 salt. Electrical measurements were made in the temperature range 300-370 K as a function of dopant concentration. The nature of charge transport in this system was determined using Wagner's polarization technique and was found to be predominantly due to ions.
ISSN:1539-445X
1539-4468
DOI:10.1080/15394450701405291