CPC C09K 11/56 (2013.01) [C09K 11/582 (2013.01); C09K 11/661 (2013.01); B82Y 20/00 (2013.01); B82Y 40/00 (2013.01)] | 20 Claims |
1. A process for synthesizing core/shell nanocrystals, wherein each of the core/shell nanocrystals includes a respective copper sulfide core and a respective lead sulfide shell, the process comprising:
mixing an amount of Pb-oleate with 1-octadecene reaction flask within an N2 glovebox to form a Pb-oleate mixture;
removing the flask from the glovebox and heating the Pb-oleate mixture under an argon atmosphere to 60° C.;
while maintaining the temperature of the Pb-oleate mixture at 60° C., adding an amount of copper sulfide core hexane solution and an amount of bis(trimethylsilyl)sulfide stock solution to the Pb-oleate mixture to form a reaction mixture, the amount of Pb-oleate and the amount of bis(trimethylsilyl)sulfide stock solution being maintained at a Pb-oleate:bis(trimethylsilyl)sulfide molar ratio of 1.5:1;
rapidly stirring the reaction mixture for 6 minutes to form the core/shell nanocrystals from the reaction mixture, wherein each the core/shell nanocrystals includes the respective copper sulfide core and the respective lead sulfide shell;
cooling the flask to room temperature;
returning the flask to the N2 glovebox and adding toluene and acetonitrile to the flask in the N2 glovebox;
removing the reaction mixture from the flask and placing it in a centrifuge tube; and
centrifuging the reaction mixture to precipitate and remove the core/shell nanocrystals from the reaction mixture;
wherein the amount of Pb-oleate and the amount of bis(trimethylsilyl)sulfide stock solution are configured to produce number of lead sulfide monolayers on each of the copper sulfide cores.
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