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Indian Journal of Pure & Applied Physics (IJPAP) >
IJPAP Vol.50 [2012] >
IJPAP Vol.50(02) [February 2012] >
| Title: | Optical band gap of polyvinylpyrrolidone/polyacrilamide blend thin films |
| Authors: | Rawat, A
Mahavar, H K
Chauhan, S
Tanwar, A
Singh, P J |
| Keywords: | Polymer
Blend
Optical Band Gap
Absorption Coefficient
Extinction Coefficient |
| Issue Date: | Feb-2012 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | Thin films of polyvinylpyrrolidone, polyacrilamide and their blends were
prepared using solution cast method and characterized using X-ray diffraction
(XRD) technique. Optical absorption spectra of these thin films have been
recorded in the wavelength range 190-600 nm using UV-visible spectrophotometer.
Optical band gap of the films has been calculated by using Tauc’s relation and
variations in the values of optical band gap with the variation of composition
in the blend films have been found from 4.77 to 5.10 eV. The tail width of the
localized states has been calculated by using Urbach’s relation. Absorption
coefficient and extinction coefficient have been calculated at 220 nm
wavelength in the region where the absorbance by the thin film is the maximum.
The optical band gap has been correlated with the number of carbon atoms per
molecule. |
| Page(s): | 100-104 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-1041 (Online); 0019-5596 (Print) |
| Source: | IJPAP Vol.50(02) [February 2012]
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