Cation Exchange Combined with Kirkendall Effect in the Preparation of SnTe/CdTe and CdTe/SnTe Core/Shell Nanocrystals
| Autor: | Youngjin Jang, Yaron Kauffmann, Richard Capek, Diana Yanover, Aldona Sashchiuk, Efrat Lifshitz, Arthur Shapiro, Nathan Grumbach |
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| Rok vydání: | 2016 |
| Předmět: |
Kirkendall effect
Chemistry Diffusion Shell (structure) Nanotechnology Heterojunction 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Cadmium telluride photovoltaics 0104 chemical sciences Ion Chemical engineering Nanocrystal General Materials Science Reactivity (chemistry) Physical and Theoretical Chemistry 0210 nano-technology |
| Zdroj: | The Journal of Physical Chemistry Letters. 7:2602-2609 |
| ISSN: | 1948-7185 |
| DOI: | 10.1021/acs.jpclett.6b00995 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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