Journal
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
Volume 25, Issue 4, Pages 1716-1723Publisher
SPRINGER
DOI: 10.1007/s10854-014-1788-3
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Funding
- Leading Foreign Research Institute Recruitment Program through the National Research of Korea (NRF)
- Ministry of Education, Science and Technology (MEST) [2013-044975]
- Department of Science and Technology, Science and Engineering Research Board, New Delhi [SR/FTP/PS-038/2012]
- Department of Science (DST), New Delhi, India [SR/FTP/PS-69/2008]
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In the present work, we have prepared zinc sulphide (ZnS:Mn)/zinc oxide (ZnO) core-shell nanostructures by a chemical precipitation method and observed the effect of ZnO concentration on the fluorescent nanoparticles. Change in the morphological and optical properties of core-shell nanoparticles have been observed by changing the concentration of ZnO in a core-shell combination with optimum value of Mn to be 1 % in ZnS. The morphological studies have been carried out using X-ray diffraction (XRD) and transmission electron microscopy. It was found that diameter of ZnS:Mn nanoparticles was around 4-7 nm, each containing primary crystallites of size 2.4 nm which was estimated from the XRD patterns. The particle size increases with the increase in ZnO concentration leading to the well-known ZnO wurtzite phase which was coated on the FCC phase of ZnS:Mn. Band gap studies were performed by UV-visible spectroscopy and a red shift in absorption spectra have been observed with the addition of Mn as well as with the capping of ZnO on ZnS:Mn. The formation of core-shell nanostructures have been also confirmed by FTIR analysis. Photoluminescence studies show that emission wavelength is red shifted with the addition of ZnO layer on ZnS:Mn(1 %). These core-shell ZnS:Mn/ZnO nano-composites will be a very suitable material for specific kind of tunable optoelectronic devices.
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