Synthesis and optical band gap investigation of PVA/CdS nanocomposite films
Omed Gh. Abdullah
Department of Physics, School of Science, Faculty of Science and Science Education, University of Sulaimani,
Kurdistan Region, Iraq.
Original: 23 Nov. 2014
Revised: 17 Jan. 2015
Accepted: 25 Jan. 2015
Published online: 20 March 2015
optical band gaps
The nanocomposites of polyvinyl alcohol PVA with different concentration of cadmium
NPs were obtained using chemical reduction route and casting
of CdS concentrations on the optical properties of the PVA films
infrared, ultraviolet, and visible wavelength, (190-1100)
nm. The obtained optical parameters were found to be strongly affected by CdS contents.
rivation of Tauc's relation, it was found that the direct allowed transition was
NP. The results indicate that
the obtained values of optical absorption edge and energies band gap decreases with
g salt contents, as well as the reduction of the width of the tail localized states
was observed. The study has been also extended to include the estimating of CdS particle
size from the energies band gap for the investigated nanocomposite films.