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Synthesis and Characterization of Mn Doped CdS Quantum Dots from a Single Source Precursor

Published online by Cambridge University Press:  21 February 2011

M. Azad Malik ,
Paul O'Brien  and
N. Revaprasadu
M. Azad Malik
Affiliation:
Department of Chemistry, Imperial College of Science, Technology and Medicine, Exhibition Road, ondon, W7 2AZ, UK
Paul O'Brien
Affiliation:
Manchester Materials Science Centre and Department of Chemistry, University of Manchester, Oxford Rd, Manchester M13 9PL
N. Revaprasadu
Affiliation:
Department of Chemistry, Imperial College of Science, Technology and Medicine, Exhibition Road, ondon, W7 2AZ, UK Department of Chemistry, University of Zululand, Private Bag Xl 001, Kwadlangezwa, 886.South AfricaE-mail:p.obrien@ic.ac.uk
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Abstract

CdS and Mn-doped CdS capped with TOPO (tri-n-octylphosphineoxide) have been prepared by a single source route using bis(methylhexyldithiocarbamato)cadmium(II) and manganese dichloride as precursors. The nanoparticles obtained show quantum size effects in their optical spectra with the CdS nanoparticles exhibiting near band-edge luminescence. The PL spectrum of the doped CdS nanoparticles have an emission maximum at 585 nm attributed to the 4T1-6A1 electronic transition of Mn in a tetrahedral site. However the PL spectrum changes over time (weeks) and gave a deep trap emission. The Selected Area Electron Diffraction (SAED) and X-ray diffraction (XRD) pattern show both CdS and the Mn doped CdS particles to be of the hexagonal phase. Transmission Electron Microscopy (TEM) and High Resolution TEM show well-defined images of nanosize particles with clear lattice fringes. ESR spectra and ICP results confirm the presence of Mn in the CdS nanoparticles.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 581: Symposium F – Nanophase & Nanocomposite Materials II , 1999 , 133
Copyright
Copyright © Materials Research Society 2000

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References

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