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Influence of the polyvinyl pyrrolidone concentration on particle size and dispersion of ZnS nanoparticles synthesized by microwave irradiation


Citation

Soltani, Nayereh and Saion, Elias and Haghiri, Maryam Erfani and Saraee, Khadijeh Rezaee Ebrahim and Bahmanrokh, Ghazaleh and Drummen, Gregor P. C. and Bahrami, Afarin and Hussein, Mohd Zobir (2012) Influence of the polyvinyl pyrrolidone concentration on particle size and dispersion of ZnS nanoparticles synthesized by microwave irradiation. International Journal of Molecular Sciences, 13 (10). pp. 12412-12427. ISSN 1422-0067

Abstract

Zinc sulfide semiconductor nanoparticles were synthesized in an aqueous solution of polyvinyl pyrrolidone via a simple microwave irradiation method. The effect of the polymer concentration and the type of sulfur source on the particle size and dispersion of the final ZnS nanoparticle product was carefully examined. Microwave heating generally occurs by two main mechanisms: dipolar polarization of water and ionic conduction of precursors. The introduction of the polymer affects the heating rate by restriction of the rotational motion of dipole molecules and immobilization of ions. Consequently, our results show that the presence of the polymer strongly affects the nucleation and growth rates of the ZnS nanoparticles and therefore determines the average particle size and the dispersion. Moreover, we found that PVP adsorbed on the surface of the ZnS nanoparticles by interaction of the C-N and C=O with the nanoparticle's surface, thereby affording protection from agglomeration by steric hindrance. Generally, with increasing PVP concentration, mono-dispersed colloidal solutions were obtained and at the optimal PVP concentration (5%), sufficiently small size and narrow size distributions were obtained from both sodium sulfide and thioacetamide sulfur sources. Finally, the sulfur source directly influences the reaction mechanism and the final particle morphology, as well as the average size.


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Official URL or Download Paper: http://www.mdpi.com/1422-0067/13/10/12412

Additional Metadata

Item Type: Article
Divisions: Faculty of Science
DOI Number: https://doi.org/10.3390/ijms131012412
Publisher: MDPI AG
Keywords: Bandgap; Dispersion; Microwave irradiation; Nanoparticle; Polyvinyl pyrrolidone; PVP; Quantum dot; Size; Sodium sulfide; Thioacetamide; Zinc sulfide
Depositing User: Nabilah Mustapa
Date Deposited: 05 Jun 2017 05:38
Last Modified: 05 Jun 2017 05:38
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.3390/ijms131012412
URI: http://psasir.upm.edu.my/id/eprint/52258
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