Nano Letters · 2010 · 180 citations · 33 references
Natural SciencesChemistryMaterials ScienceColloid ScienceNanomaterialsNanotechnologyHybrid NanomaterialsInorganic NanoparticlesMetal SulfidesNanomaterial CharacterizationSemiconductor Crystal GrowthSemiconductor NanomaterialsCadmium SelenideCation ExchangeHeterostructuresMetal NanoparticlesMetal Sulfide NanomaterialsNanocrystal Growth MechanismsNanocrystal SynthesisNanocrystals
The growth behavior of cadmium chalcogenides (CdE = CdS, CdSe, and CdTe) on sphalerite Cu(2-x)Se nanocrystals (size range 10-15 nm) is studied. Due to the capability of Cu(2-x)Se to undergo a fast and quantitative cation exchange reaction in the presence of excessive Cd(2+) ions, no Cu(2-x)Se/CdE heterostructures are obtained and instead branched CdSe/CdE nanocrystals are built which consist of a sphalerite CdSe core and wurtzite CdE arms. While CdTe growth yields multiarmed structures with overall tetrahedral symmetry, CdS and CdSe arm growth leads to octapod-shaped nanocrystals. These results differ significantly from literature findings about the growth of CdE on sphalerite CdSe particles, which until now had always yielded tetrapod-shaped nanocrystals.
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Controlled growth of tetrapod-branched inorganic nanocrystals
Liberato Manna, Delia J. Milliron, A. Meisel et al. · Nature Materials · 2003 · 1.4K citations
Cation Exchange Reactions in Ionic Nanocrystals
Dong Hee Son, Steven M. Hughes, Yadong Yin et al. · Science · 2004 · 1.3K citations