Journal
SOLID STATE COMMUNICATIONS
Volume 152, Issue 7, Pages 596-602Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ssc.2012.01.023
Keywords
ZnS:Cr; Chemical method; Color tuning; Room temperature ferromagnetism
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Funding
- University Grants Commission (UGC), New Delhi, Government of India
- UGC
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ZnS:Cr (3 at.%) nanoparticles were synthesized by chemical co-precipitation method using EDTA as capping agent. The samples were annealed in air for 3 h in steps of 100 degrees C in the temperature range of 200-700 degrees C. The effect of annealing temperatures on the structural and photoluminescence properties of Cr doped ZnS nanoparticles was investigated using X-ray Diffraction (XRD), a Scanning Electron Microscope (SEM), Energy Dispersive X-ray spectroscopy (EDS), Diffuse Reflectance Spectra (DRS), Vibrating Sample Magnetometer (VSM) and Photoluminescence (PL) techniques. EDS spectra confirmed the presence of Cr in the samples with expected stoichiometry. XRD studies confirmed the formation of ZnO above 500 degrees C. Photoluminescence studies on ZnS:Cr nanoparticles indicated that the emission wavelength is tunable in the range of 440-675 nm as a function of annealing temperature. VSM results indicated a decrease in ferromagnetism with increase in annealing temperature, perhaps due to appreciable variation in structural defects that are sensitive to annealing temperature. (C) 2012 Elsevier Ltd. All rights reserved.
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