Z. Naturforsch. 68a, 398 – 404
Selective Growth of Gold onto Copper Indium Sulfide Selenide Nanoparticles
University of Oldenburg, Institute of Physics, Energy and Semiconductor Research, Carl-von-Ossietzky-Straße 9–11, 26129 Oldenburg
Received January 23, 2013 / published online April 10, 2013
Hybrid nanostructures are interesting materials for numerous applications in chemistry, physics, and biology, due to their novel properties and multiple functionalities. Here, we present a synthesis of metal–semiconductor hybrid nanostructures composed of nontoxic I-III-VI semiconductor nanoparticles and gold. Copper indium sulfide selenide (CuInSSe) nanocrystals with zinc blende structure and trigonal pyramidal shape, capped with dodecanethiol, serve as an original semiconductor part of a new hybrid nanostructure. Metallic gold nanocrystals selectively grow onto vertexes of these CuInSSe pyramids. The hybrid nanostructures were studied by transmission electron microscopy, energy dispersive X-ray analysis, X-ray diffraction, and UV-Vis-absorption spectroscopy, which allowed us conclusions about their growth mechanism. Hybrid nanocrystals are generated by replacement of a sacrificial domain in the CuInSSe part. At the same
time, small selenium nanocrystals form that stay attached to the remaining CuInSSe/Au particles. Additionally, we compare the synthesis and properties of CuInSSe-based hybrid nanostructures with those of copper indium disulfide (CuInS2). CuInS2/Au nanostructures grow by a different mechanism (surface growth) and do not show any selectivity.
Key words: Copper Indium Selenide; Copper Indium Sulfide; Metal–Semiconductor Hybrid; Nanostructures; Gold; Heterogeneous Nucleation.