title: Octapod-shaped colloidal nanocrystals of cadmium chalcogenides via "one-pot" cation exchange and seeded growth.
abstract: 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.
authors.affiliation: Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy.
authors.forename: Sasanka
authors.initials: S
authors.lastname: Deka
authors.forename: Karol
authors.initials: K
authors.lastname: Miszta
authors.forename: Dirk
authors.initials: D
authors.lastname: Dorfs
authors.forename: Alessandro
authors.initials: A
authors.lastname: Genovese
authors.forename: Giovanni
authors.initials: G
authors.lastname: Bertoni
authors.forename: Liberato
authors.initials: L
authors.lastname: Manna