Abstract
We report the chemical synthesis of Cr-doped ZnS nanocrystallites without using any capping ligand/surfactant. An unusual increase in bandgap observed for Cr-doped samples was understood in terms of the Burstein–Moss effect. Additionally, 4A2(F) → 4T1(F) and 4A2(F) → 4T2(F) transitions in the absorption spectra confirmed the substitution of Cr3+ ions at the octahedrally coordinated interstitial sites. Photoluminescence study showed a large amount of Zn vacancies owing to the incorporation of Cr3+ ions which intensified the self-activated blue–green luminescence. Room-temperature magnetization showed FM ordering up to the 2% Cr doping, which gradually transformed into paramagnetic behavior at higher values and became more enhanced in the low-temperature range. Thus, in the present synthesis method, the FM order could only be observed up to the 2% Cr doping concentration. Also, the activation energy was observed to increase with the increase of Cr doping concentration.
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Acknowledgments
The authors gratefully acknowledge the Department of Physics, Banaras Hindu University, Varanasi, India, for XRD, SEM, TEM and PL measurements, and Dr. Alok Banerjee, UGC, DAE Consortium, Indore, India, for providing M-H and M-T measurements.
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Patel, P.C., Ghosh, S. & Srivastava, P.C. Unusual Ferromagnetic to Paramagnetic Change and Bandgap Shift in ZnS:Cr Nanoparticles. J. Electron. Mater. 48, 7031–7039 (2019). https://doi.org/10.1007/s11664-019-07507-w
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DOI: https://doi.org/10.1007/s11664-019-07507-w