Selective Facet Reactivity During Cation Exchange in Cadmium Sulfide Nanorods [electronic resource].
- Berkeley, Calif. : Lawrence Berkeley National Laboratory, 2008. and Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
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- Lawrence Berkeley National Laboratory and United States. Department of Energy. Office of Scientific and Technical Information
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- Free-to-read Unrestricted online access
- The partial transformation of ionic nanocrystals through cation exchange has been used to synthesize nanocrystal heterostructures. We demonstrate that the selectivity for cation exchange to take place at different facets of the nanocrystal plays an important role in determining the resulting morphology of the binary heterostructure. In the case of copper I (Cu+) cation exchange in cadmium sulfide (CdS) nanorods, the reaction starts preferentially at the ends of the nanorods such that copper sulfide (Cu2S) grows inwards from either end. The resulting morphology is very different from the striped pattern obtained in our previous studies of silver I (Ag+) exchange in CdS nanorods where non-selective nucleation of silver sulfide (Ag2S) occurs. From interface formation energies calculated for several models of epitaxialconnections between CdS and Cu2S or Ag2S, we infer the relative stability of each interface during the nucleation and growth of Cu2S or Ag2S within the CdS nanorods. The epitaxial connections of Cu2S to the end facets of CdS nanorods minimize the formation energy, making these interfaces stable throughout the exchange reaction. However, as the two end facets of wurtzite CdS nanorods are crystallographically nonequivalent, asymmetric heterostructures can be produced.
- Published through SciTech Connect., 12/18/2008., "lbnl-1385e", Journal of the American Chemical Society 131 14 ISSN 0002-7863; JACSAT FT, Alivisatos, A. Paul; Hughes, Steven; Wang, Lin-Wang; Dahmen, Ulrich; Demchenko, Denis; Sadtler, Bryce; Zheng, Haimei; Merkle, Maxwell., Computational Research Division, and Materials Sciences Division
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