Single-step synthesis of hyperbranched, luminescent Mn2+-doped ZnSe1−xSx nanocrystals using dichalcogenide precursors
| Autor: | Matthew T. Webb, Emily J. McLaurin, Mohammad S. Yazdanparast |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
chemistry.chemical_classification
Materials science Photoluminescence Aqueous solution Doping 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Branching (polymer chemistry) Photochemistry 01 natural sciences Dithiothreitol 0104 chemical sciences chemistry.chemical_compound chemistry Nanocrystal Materials Chemistry Thiol 0210 nano-technology Luminescence |
| Zdroj: | Journal of Materials Chemistry C. 4:6907-6913 |
| ISSN: | 2050-7534 2050-7526 |
| DOI: | 10.1039/c6tc01207h |
| Popis: | Taking advantage of dichalcogenide precursors, a simple, single-step heat-up method for obtaining Mn2+-doped ZnSe1−xSx nanocrystals (NCs) is presented. Tuning the ratios of diselendide and disulfide precursors results in alloys with varying shape, size and composition. When diphenyldiselenide (Ph2Se2) is used, highly branched networks of small NCs form. Dimethydisulfide (Me2S2) induces formation of larger NCs with less branching. Mixtures of the two exhibit branching proportional to the amount of Ph2Se2vs. Me2S2, allowing formation of a series of branched Mn2+-doped NCs. Interestingly, these NCs exhibit photoluminescence (PL) characteristic of Mn2+, despite the large number of defects and unusual shapes they possess. This demonstrates Mn2+ can be successfully doped into NCs with several degrees of branching, in which it acts as an efficient radiative trap. Addition of thiol to the NCs led to a large enhancement in the Mn2+ PL. In organic solution, the sensitivity to thiol varied with the degree of NC branching, with hyperbranching NCs giving the most sensitive response. After transfer to aqueous solution, the Mn2+ PL of the hyperbranched NCs increased dramatically in response to μM concentrations of dithiothreitol (DTT). |
| Databáze: | OpenAIRE |
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