Res. Chem. Intermed.
, Vol. 32, No. 7, pp. 683–693 (2006)
Also available online - www.vsppub.com
Synthesis and characterisation of small ZnS particles
, F. MENEAU
, G. SANKAR
J. M. THOMAS
, B. SPLIETHOFF
, F. SCHÜTH
and S. COLUCCIA
Davy Faraday Research Laboratory, The Royal Institution of Great Britain, 21 Albemarle Street,
London W1S 4BS, UK
Department of Inorganic, Physical and Materials Chemistry, NIS Center of Excellence,
University of Torino, via P. Giuria, 7 I-10125 Torino, Italy
Max-Planck-Institut für Kohlenforschung, Department of Heterogeneous Catalysis,
Kaiser-Wilhelm-Platz 1, Mülheim an der Ruhr, Germany
Received 6 December 2005; accepted 12 January 2006
Abstract—Small ZnS particles, prepared at room temperature in an alcoholic medium using a zinc
salt and thioacetamide as sulphur source, have been characterised using a suite of techniques which
includes XRD, TEM and Zn K-edge EXAFS. The investigation suggests that aggregates of small
sphalerite particles (cubic lattice), with average size of 3.5 nm and well-deﬁned morphology are
obtained and the particle size appears not to change with increase in the reaction time from 2 to 24 h.
Zn K-edge EXAFS experiments were performed at 10 K, in order to reduce thermal disorder and the
reﬁnement of the EXAFS data resulted in very small second shell coordination numbers with respect
to the bulk samples. The result is in good agreement with SEM and XRD data about the presence
of nanosized particles, having a large number of surface atoms with low second shell coordination
Keywords: ZnS; nanoparticles; EXAFS; TEM.
Since the discovery of the unique properties and potential applications in photocatal-
ysis and optoelectronics, many studies have been devoted to the preparation of semi-
conductors belonging to groups II–VI and III–V of the periodic table . Different
chemical routes have been used to prepare small semiconducting nanoparticles. The
most common way is to use stabilizing agents like surfactants, organic or inorganic
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