Quantum confinement effect of CdS nanoparticles dispersed within PVP/PVA nanocomposites

Nanocomposite films of CdS nanoparticles within PVP/PVA blend were prepared. The prepared films were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy, Ultraviolet–visible spectroscopy (UV–vis), transmission electron microscopy (TEM) and photoluminescence (PL) spectra...

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Bibliographic Details
Published in:Journal of materials science. Materials in electronics 2013-08, Vol.24 (8), p.2956-2961
Main Authors: Elashmawi, I. S., Abdelghany, A. M., Hakeem, N. A.
Format: Article
Language:English
Subjects:
Applied sciences
Cadmium
Cadmium sulfides
Characterization and Evaluation of Materials
Chemistry and Materials Science
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Cross-disciplinary physics: materials science
rheology
Electronics
Exact sciences and technology
Materials
Materials Science
Nanocomposites
Nanoparticles
Nanopowders
Nanoscale materials and structures: fabrication and characterization
Optical and Electronic Materials
Optical constants: refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Optical properties of bulk materials and thin films
Photoluminescence
Physics
Polyvinyl alcohols
Quantum confinement
Spectra
Transmission electron microscopy
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Summary:Nanocomposite films of CdS nanoparticles within PVP/PVA blend were prepared. The prepared films were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy, Ultraviolet–visible spectroscopy (UV–vis), transmission electron microscopy (TEM) and photoluminescence (PL) spectra. The amount of Cd + used strongly influenced the size of the CdS nanoparticles, which was confirmed by XRD, UV–vis absorption spectra, PL emission spectra and TEM images. Smaller sized CdS nanoparticles were formed in higher content of cadmium. The results of XRD indicate that CdS nanoparticles were formed with hexagonal phase in the polymeric matrix. PL and UV–vis spectra reveal that nanocomposite films shows quantum confinement effect. Optical band gap and particle size were calculated and is in agreement with the results obtained from TEM data. The direct energy band gap was increased up to 2.86 eV.
ISSN:0957-4522
1573-482X
DOI:10.1007/s10854-013-1197-z