title: Reaction of Ni(2+) and SnS as a Way to Form Ni@SnS and Sn2Ni3S2 Nanocrystals: Control of Product Formation and Shape.
abstract: Reductive diffusion of Ni(2+) into SnS particles was shown to selectively form Sn2Ni3S2, hybrid, or even core-shell Ni@SnS, Ni1.523Sn, and Ni3S2, by tuning the reaction conditions at low temperatures. The mechanism of Ni(2+) reduction and diffusion into SnS was observed in ethylene glycol, which served both as solvent and reducing agent. Tuning of reaction temperature and duration, morphology of the template SnS, and the application of ethylenediamine as supporting chelating agent, influence the formation of the final products. Their formation was controlled by carefully adjusting redox and equilibrium reactions. The products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy analysis (EDX).
authors.affiliation: Institute of Inorganic Chemistry, University of Regensburg, Universitätsstr. 31, 93040 Regensburg (Germany).
authors.forename: Stefan Michael
authors.initials: SM
authors.lastname: Rommel
authors.affiliation: Institute of Inorganic Chemistry, University of Regensburg, Universitätsstr. 31, 93040 Regensburg (Germany). richard.weihrich@chemie.uni-regensburg.de.|Departement of Chemistry, TU Munich, Lichtenbergstr. 4, 85474 Garching (Germany). richard.weihrich@chemie.uni-regensburg.de.
authors.forename: Richard
authors.initials: R
authors.lastname: Weihrich
keywords: formation mechanism; nanoparticles; synthetic methods; template synthesis; ternary chalcogenide