Nanosecond laser irradiation synthesis of CdS nanoparticles in a PVA system

We herein report a modified, in situ photolytic process for the nucleation and growth of cadmium sulphide nanoparticles in the presence of an optically transparent and semicrystalline polyvinyl alcohol (PVA) polymer matrix. The laser causes a localized decomposition of the precursor species in the i...

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Bibliographic Details
Published in:Applied surface science 2014-01, Vol.290, p.18-26
Main Authors: ONWUDIWE, Damian C, KRÜGER, Tjaart P. J, OLUWATOBI, Oluwafemi S, STRYDOM, Christien A
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Decomposition
Exact sciences and technology
Lasers
Nanoparticles
Nanostructure
Particulate composites
Physics
Polyvinyl alcohols
Scanning electron microscopy
Thermal stability
Transmission electron microscopy
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Description
Summary:We herein report a modified, in situ photolytic process for the nucleation and growth of cadmium sulphide nanoparticles in the presence of an optically transparent and semicrystalline polyvinyl alcohol (PVA) polymer matrix. The laser causes a localized decomposition of the precursor species in the immediate vicinity of the polymer leading to highly confined nanocrystals. The as-synthesized PVA-CdS nanocomposite were characterized using UV-vis absorption and photoluminescence spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), high resolution TEM (HRTEM) and powdered X-ray diffraction (XRD). Strong blue shift in the band gap was observed in UV visible absorption spectrum indicating the size confinement. The influence of deposition temperature (25-200 degree C) on the optical properties, microstructure, and thermal stability was also investigated. Thermal decomposition behaviors of these composites exhibit decreased thermal stability as indicated by the shift in the decomposition temperature of the pure PVA. XRD patterns revealed a reduction in the crystallinity of the polymer due to the entrapped particles. The nanocomposites showed the existence of both cubic and hexagonal phases.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2013.10.165