title: Cation Exchange Combined with Kirkendall Effect in the Preparation of SnTe/CdTe and CdTe/SnTe Core/Shell Nanocrystals.
abstract: Controlling the synthesis of narrow band gap semiconductor nanocrystals (NCs) with a high-quality surface is of prime importance for scientific and technological interests. This Letter presents facile solution-phase syntheses of SnTe NCs and their corresponding core/shell heterostructures. Here, we synthesized monodisperse and highly crystalline SnTe NCs by employing an inexpensive, nontoxic precursor, SnCl2, the reactivity of which was enhanced by adding a reducing agent, 1,2-hexadecanediol. Moreover, we developed a synthesis procedure for the formation of SnTe-based core/shell NCs by combining the cation exchange and the Kirkendall effect. The cation exchange of Sn(2+) by Cd(2+) at the surface allowed primarily the formation of SnTe/CdTe core/shell NCs. Further continuation of the reaction promoted an intensive diffusion of the Cd(2+) ions, which via the Kirkendall effect led to the formation of the inverted CdTe/SnTe core/shell NCs.
authors.affiliation: Schulich Faculty of Chemistry, Solid State Institute, Russell Berrie Nanotechnology Institute, Nancy and Stephen Grand Technion Energy Program, and ‡Department of Materials Science and Engineering, Technion-Israel Institute of Technology , Haifa 3200003, Israel.
authors.forename: Youngjin
authors.initials: Y
authors.lastname: Jang
authors.affiliation: Schulich Faculty of Chemistry, Solid State Institute, Russell Berrie Nanotechnology Institute, Nancy and Stephen Grand Technion Energy Program, and ‡Department of Materials Science and Engineering, Technion-Israel Institute of Technology , Haifa 3200003, Israel.
authors.forename: Diana
authors.initials: D
authors.lastname: Yanover
authors.affiliation: Schulich Faculty of Chemistry, Solid State Institute, Russell Berrie Nanotechnology Institute, Nancy and Stephen Grand Technion Energy Program, and ‡Department of Materials Science and Engineering, Technion-Israel Institute of Technology , Haifa 3200003, Israel.
authors.forename: Richard Karel
authors.initials: RK
authors.lastname: Čapek
authors.affiliation: Schulich Faculty of Chemistry, Solid State Institute, Russell Berrie Nanotechnology Institute, Nancy and Stephen Grand Technion Energy Program, and ‡Department of Materials Science and Engineering, Technion-Israel Institute of Technology , Haifa 3200003, Israel.
authors.forename: Arthur
authors.initials: A
authors.lastname: Shapiro
authors.affiliation: Schulich Faculty of Chemistry, Solid State Institute, Russell Berrie Nanotechnology Institute, Nancy and Stephen Grand Technion Energy Program, and ‡Department of Materials Science and Engineering, Technion-Israel Institute of Technology , Haifa 3200003, Israel.
authors.forename: Nathan
authors.initials: N
authors.lastname: Grumbach
authors.affiliation: Schulich Faculty of Chemistry, Solid State Institute, Russell Berrie Nanotechnology Institute, Nancy and Stephen Grand Technion Energy Program, and ‡Department of Materials Science and Engineering, Technion-Israel Institute of Technology , Haifa 3200003, Israel.
authors.forename: Yaron
authors.initials: Y
authors.lastname: Kauffmann
authors.affiliation: Schulich Faculty of Chemistry, Solid State Institute, Russell Berrie Nanotechnology Institute, Nancy and Stephen Grand Technion Energy Program, and ‡Department of Materials Science and Engineering, Technion-Israel Institute of Technology , Haifa 3200003, Israel.
authors.forename: Aldona
authors.initials: A
authors.lastname: Sashchiuk
authors.affiliation: Schulich Faculty of Chemistry, Solid State Institute, Russell Berrie Nanotechnology Institute, Nancy and Stephen Grand Technion Energy Program, and ‡Department of Materials Science and Engineering, Technion-Israel Institute of Technology , Haifa 3200003, Israel.
authors.forename: Efrat
authors.initials: E
authors.lastname: Lifshitz