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Issue 84, 2014
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Mn2+ ion influenced optical and photocatalytic behaviour of Mn–ZnS quantum dots prepared by a microwave assisted technique

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Abstract

Fluorescent zinc blende structured pure and Mn2+ ion doped ZnS (Mn–ZnS) quantum dots were prepared via a rapid microwave assisted technique without any surfactants and their photocatalytic activity was tested for the photodegradation of methyl orange dye under UV light irradiation. They were characterized by X-ray diffraction, FE-SEM, UV-Vis and photoluminescence spectroscopies, XRF and BET surface area analysis. The Mn–ZnS quantum dots possessed a cubic blende crystal structure without any impurity phases. The absorption maximum by UV-Vis spectroscopy showed a blue shift with increasing Mn2+ content. Photoluminescence of Mn–ZnS was obtained as a result of combined broad blue emission from sulfur vacancies existing in the ZnS host and orange emission from the 4T1–6A1 transition of Mn2+. The relative intensity of blue to orange emissions was found to be quenched with increasing Mn2+ ion concentration. Methyl orange dye was photodegraded by Mn–ZnS quantum dots effectively up to a doping level of 4.28% Mn2+ and further increase in Mn2+ decreased the photocatalytic activity. Detailed mechanisms of photoluminescence and photocatalytic activity were proposed and discussed. The results suggested that the Mn–ZnS material is a potential candidate for photocatalytic applications.

Graphical abstract: Mn2+ ion influenced optical and photocatalytic behaviour of Mn–ZnS quantum dots prepared by a microwave assisted technique

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Supplementary files

Article information


Submitted
16 Aug 2014
Accepted
04 Sep 2014
First published
05 Sep 2014

RSC Adv., 2014,4, 44592-44599
Article type
Paper
Author version available

Mn2+ ion influenced optical and photocatalytic behaviour of Mn–ZnS quantum dots prepared by a microwave assisted technique

S. Joicy, R. Saravanan, D. Prabhu, N. Ponpandian and P. Thangadurai, RSC Adv., 2014, 4, 44592
DOI: 10.1039/C4RA08757G

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