title: Spontaneous formation of wurzite-CdS/zinc blende-CdTe heterodimers through a partial anion exchange reaction.
abstract: Ion exchange of ionic semiconductor nanoparticles (NPs) is a facile method for the synthesis of type-II semiconductor heterostructured NPs with staggered alignment of band edges for photoelectric applications. Through consideration of the crystallographic orientation and strain at the heterointerface, well-designed heterostructures can be constructed through ion exchange reactions. Here we report the selective synthesis of anisotropically phase-segregated cadmium sulfide (CdS)/ cadmium telluride (CdTe) heterodimers via a novel anion exchange reaction of CdS NPs with an organic telluride precursor. The wurtzite-CdS/zinc blende-CdTe heterodimers in this study resulted from spontaneous phase segregation induced by the differences in the crystal structures of the two phases, accompanying a centrosymmetry breaking of the spherical CdS NPs. The CdS/CdTe heterodimers exhibited photoinduced spatial charge separation because of their staggered band-edge alignment.
authors.affiliation: Department of Chemistry, Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennoidai, Tsukuba, Ibaraki 305-8571, Japan.
authors.forename: Masaki
authors.initials: M
authors.lastname: Saruyama
authors.forename: Yeong-Gi
authors.initials: YG
authors.lastname: So
authors.forename: Koji
authors.initials: K
authors.lastname: Kimoto
authors.forename: Seiji
authors.initials: S
authors.lastname: Taguchi
authors.forename: Yoshihiko
authors.initials: Y
authors.lastname: Kanemitsu
authors.forename: Toshiharu
authors.initials: T
authors.lastname: Teranishi
mesh_terms: D000838:Anions / Q000737:chemistry; D019187:Cadmium Compounds / Q000737:chemistry*; D019281:Dimerization; D053758:Nanoparticles / Q000737:chemistry; D010316:Particle Size; D012666:Semiconductors; D013440:Sulfides / Q000737:chemistry*; D013499:Surface Properties; D013691:Tellurium / Q000737:chemistry*; D015032:Zinc / Q000737:chemistry*
chemical_list: D000838:Anions; D019187:Cadmium Compounds; D013440:Sulfides; C034939:cadmium sulfide; D015032:Zinc; D013691:Tellurium; C028337:cadmium telluride