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Optical and Magnetic Properties of Manganese-Doped Zinc Sulfide Nanoclusters

Sapra, Sameer and Nanda, J and Anand, A and Bhat, SV and Sarma, DD (2003) Optical and Magnetic Properties of Manganese-Doped Zinc Sulfide Nanoclusters. In: Journal of Nanoscience and Nanotechnology, 3 (5). pp. 392-400.

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We report the synthesis of fixed-size ZnS nanoclusters ~24 Å in diameter with varying manganese concentrations. Various samples of $Zn_{1-x} Mn_x S$, with x = 0, 0.02, 0.055, 0.09, and 0.13, have been prepared and characterized using X-ray diffraction, energy-dispersive analysis of X-rays, UV absorption, fluorescence emission and excitation, electron paramagnetic resonance (EPR), and magnetic susceptibility measurements. The manganese ions are found to substitute Zn randomly without giving rise to any clustering of Mn sites, as seen from EPR and magnetic susceptibility results. Our studies reveal that the band gap of the doped nanoclusters passes through a maximum as the manganese concentration is varied. Also, we observe orange emission from $Mn^{2+}$ ions in the doped ZnS nanoclusters, apart from the blue emission characteristic of the ZnS defect states. The relative intensity of the orange emission compared with the blue varies with the manganese concentration in a nonmonotonic way. The inverse of susceptibility temperature plots can be plotted onto a universal curve by simple multiplicative constants, thus showing that the magnetic interactions between $Mn^{2+$} ions are weak.

Item Type: Journal Article
Publication: Journal of Nanoscience and Nanotechnology
Publisher: American Scientific Publishers
Additional Information: The Copyright belongs to American Scientific Publishers.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Division of Physical & Mathematical Sciences > Physics
Date Deposited: 19 Apr 2006
Last Modified: 27 Aug 2008 11:53
URI: http://eprints.iisc.ac.in/id/eprint/6333

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