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Geometrical Recognition:  A General Route to Shape-Controlled Syntheses of Transitional Metal Chalcogenides, Silicides, and Copper(I) Chloride Nanocrystals

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journal contribution
posted on 06.03.2008, 00:00 by Hao-Xu Zhang, Qing Peng, Ya-Dong Li
In our former publications (J. Phys. Chem. B 2005, 109, 11585; and J. Phys. Chem. B 2006, 110, 14107), we have proposed the geometrically kinetic competition (GKC) mechanism to be responsible for the silica-vapor-pressure-dependent growth of silica-sheathed Fe7S8 and digenite Cu2S nanocrystals. Here, we demonstrate that geometrical recognition (GR), the basis of GKC, can be a general route to shape-controlled syntheses of a host of materials' nanocrystals. According to the types of the metal (or silicon for CoSi and MnSi) atom sublattices, the experimental results are presented, and the mechanisms for the growth of various shapes of products are discussed in detail. SiO4 clusters have been proposed as the competing opponents to SiO3 clusters for shape-controlled syntheses of MnS, CuCl, Cu2S, CdS, ZnSe, and ZnS nanocrystals.