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- W2805203208 abstract "We demonstrate a synthetic method to add a ZnS shell, with controlled thickness, to PbS nanocrystals using Zn oleate and thioacetamide as Zn and S precursors. The ZnS shell reaction is self-limiting and deposits approximately a monolayer of ZnS per shell reaction without causing the PbS nanocrystals to Ostwald ripen. The reaction is self-limiting because the sulfur precursor, thioacetamide, is less reactive toward the PbS/ZnS core/shell nanocrystal surface as compared to the Zn oleate precursor present in the reaction solution. To increase the ZnS shell thickness beyond a monolayer, subsequent ZnS shell reactions are modified by adding the thioacetamide 10 minutes before the Zn oleate. This gives the thioacetamide time to react at the PbS/ZnS core/shell nanocrystal surface before the Zn oleate is added. High angle annular dark field scanning transmission electron microscopy (HAADF-STEM) shows most ZnS shells lack crystalline order. However, select core/shell nanocrystals have epitaxial crystalline (zinc-b..." @default.
- W2805203208 created "2018-06-13" @default.
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- W2805203208 date "2018-06-01" @default.
- W2805203208 modified "2023-09-24" @default.
- W2805203208 title "Synthesis and Characterization of PbS/ZnS Core/Shell Nanocrystals" @default.
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- W2805203208 doi "https://doi.org/10.1021/acs.chemmater.8b01421" @default.
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