Synthesis and optical band gap investigation of PVA/CdS nanocomposite films

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. 

e.mail: omed.abdullah@univsul.edu.iq


Article info
Original: 23 Nov. 2014 
Revised: 17 Jan. 2015 
Accepted: 25 Jan. 2015
Published online: 20 March 2015

Key Words:
Nanocomposite 
CdS nanoparticle 
optical band gaps 
particle size 

Abstract

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.

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