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Deposition of zinc sulfide quantum dots from a single-source molecular precursor

Published online by Cambridge University Press:  31 January 2011

N. Revaprasadu ,
M. Azad Malik ,
P. O'Brien  and
G. Wakefield
N. Revaprasadu
Affiliation:
Department of Chemistry, Imperial College of Science, Technology and Medicine, South Kensington, London SW7 2AZ, United Kingdom, and Department of Chemistry, University of Zululand, Private Bag X1001, Kwadlangezwa 3886
M. Azad Malik
Affiliation:
Department of Chemistry, Imperial College of Science, Technology and Medicine, South Kensington, London SW7 2AZ, United Kingdom
P. O'Brien
Affiliation:
Department of Chemistry, Imperial College of Science, Technology and Medicine, South Kensington, London SW7 2AZ, United Kingdom
G. Wakefield
Affiliation:
Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, United Kingdom
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Abstract

Nanoparticles of ZnS capped with tri-n-octylphosphineoxide (TOPO) and close to monodispersed have been prepared by a single-source route using ethyl(di-ethyldithiocarbamato)zinc(II) as a precursor. The nanoparticles obtained showed quantum size effects in their optical spectra, and the photoluminescence spectrum showed a broad emission that could be attributed to the surface traps. A blue shift of 0.31 eV in relation to the bulk material was observed. The selected area electron diffraction, x-ray diffraction pattern and transmission electron microscopy showed the material to be of the zinc blend structure. The crystallinity of the material was also evident from high-resolution transmission electron microscopy, which gave well-defined images of nano-sized particles with clear lattice fringes and a spacing of approximately 3 Å, corresponding to the (111) planes of the cubic crystalline ZnS phase and in the size range of 3.9–4.9 nm. The presence of strong phosphorus peak in the energy dispersion analytical x-ray pattern, together with a shift in infrared band for P = O of TOPO showed that the particles were TOPO capped.

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Type
Articles
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Journal of Materials Research , Volume 14 , Issue 8 , August 1999 , pp. 3237 - 3240
Copyright
Copyright © Materials Research Society 1999

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