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Thiol-Capped CdSe and CdTe Nanoclusters: Synthesis by a Wet Chemical Route, Structural and Optical Properties

Published online by Cambridge University Press:  09 August 2011

A. L. Rogach ,
A Eychmüller ,
J. Rockenberger ,
A. Kornowski ,
H. Weller ,
L. Troger ,
M. Y. Gao ,
M. T. Harrison ,
S. V. Kershaw  and
M. G. Burt
A. L. Rogach
Affiliation:
Institute of Physical Chemistry, University of Hamburg, 20146 Hamburg, Germany Physico-Chemical Research Institute, Belarussian State University, 220050 Minsk, Belarus
A Eychmüller
Affiliation:
Institute of Physical Chemistry, University of Hamburg, 20146 Hamburg, Germany
J. Rockenberger
Affiliation:
Institute of Physical Chemistry, University of Hamburg, 20146 Hamburg, Germany University of California, Berkeley, Department of Chemistry, Berkeley, CA 94720, USA
A. Kornowski
Affiliation:
Institute of Physical Chemistry, University of Hamburg, 20146 Hamburg, Germany
H. Weller
Affiliation:
Institute of Physical Chemistry, University of Hamburg, 20146 Hamburg, Germany
L. Troger
Affiliation:
Hamburger Synchrotronstrahlungslabor HASYLAB, DESY, 22603 Hamburg, Germany
M. Y. Gao
Affiliation:
Max-Planck-Institute of Colloids and Interfaces, 12489 Berlin, Germany
M. T. Harrison
Affiliation:
BT Laboratories, Martlesham Heath, Ipswich, Suffolk, IP5 3RE, UK
S. V. Kershaw
Affiliation:
BT Laboratories, Martlesham Heath, Ipswich, Suffolk, IP5 3RE, UK
M. G. Burt
Affiliation:
BT Laboratories, Martlesham Heath, Ipswich, Suffolk, IP5 3RE, UK
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Abstract

CdSe and CdTe nanoclusters were formed in aqueous solutions at moderate temperatures by a wet chemical route in the presence of thiols as effective stabilizing agents. The nature of the stabilizing agent (thioalcohols or thioacids) had an important influence on the particle size and largely determined the photoluminescence properties. The nanoclusters were characterized by means of UV-vis absorption and photoluminescence spectroscopy, powder X-ray diffraction, high resolution transmission electron microscopy, and extended X-ray absorption fine structure measurements. CdSe and CdTe nanoclusters were crystalline, in the cubic zincblende phase, with mean sizes in the range of 2 to 5 nm depending on the preparative conditions and the postpreparative size-selective fractionation, and showed pronounced electronic transitions in the absorption spectra. Thioglycerol-stabilized CdTe nanoclusters possessed sharp band-egde photoluminescence being tunable with particle size.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 536: Symposium F – Microcrystalline & Nanocrystalline Semiconductors - 1998 , 1998 , 365
Copyright
Copyright © Materials Research Society 1999

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