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Structural and optical properties of PVP-capped nanocrystalline ZnxCd1−xS solid solutions


Citation

Vernosfaderani, Mina Askari and Soltani, Nayereh and Saion, Elias and Mat Yunus, Wan Mahmood and Haghiri, Maryam Erfani and Dorostkar, Mahdi (2015) Structural and optical properties of PVP-capped nanocrystalline ZnxCd1−xS solid solutions. Superlattices and Microstructures, 81. pp. 193-201. ISSN 0749-6036; ESSN: 1096-3677

Abstract

Nanocrystalline ZnxCd1−xS solid solutions were prepared in a microwave-assisted hydrothermal process with gradient distribution of components (x = 0.1, 0.3, 0.5, 0.7, and 0.9). The growth of the cubic-structured quantum dots was observed for all component stoichiometries with the crystallite size between 4.5 and 5.7 nm. The obvious peak shifts have been found in the XRD patterns and the lattice parameters showed linear variation with x increasing. The evolution of the optical properties of obtained solid solutions including absorption and photoemission was also monitored in detail. The solid solutions show a considerable shift in the nanoparticle optical absorption edge from 482 to 343 nm with the increasing of Zn fraction. The band gaps of the solid solutions were estimated to be between 2.94 and 3.40 eV and the position of conduction band was shifted toward more negative potential with x increasing. The photoluminescence spectra showed a broad blue-green emission spreading up to 600 nm with emergence of three dominant peaks belong to sulfur, zinc, and cadmium vacancies.


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Additional Metadata

Item Type: Article
Divisions: Faculty of Science
DOI Number: https://doi.org/10.1016/j.spmi.2015.01.011
Publisher: Elsevier
Keywords: Ternary quantum dot; Microwave-assisted hydrothermal; Nanoparticles; Semiconductor
Depositing User: Nabilah Mustapa
Date Deposited: 05 Jun 2017 05:03
Last Modified: 05 Jun 2017 05:03
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1016/j.spmi.2015.01.011
URI: http://psasir.upm.edu.my/id/eprint/52186
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