Facile capping CdS and ZnS shells by thermolysis of ethylxanthate precursors for CdSe/CdS/ZnS nanocrystals

摘要

We described the tunable CdS and ZnS shells by facile thermolysis of air-stable cadmium ethylxanthate (Cd(ex)_2) and zinc ethylxanthate (Zn(ex)_2) precursors for CdSe/CdS/ZnS core/shell nanocrystals (CCZ NCs). The use of Cd(ex)_2 and Zn(ex)_2 offered adjustable capping reaction temperature ranging from 175°C to 255°C for various CdSe core sizes and CdS/ZnS shell thicknesses in CCZ NCs. Injection procedures of Cd(ex)_2 and Zn(ex)_2 precursors were flexible and optional within several seconds to tens of minutes for the capping process. All these revealed a feasible route to coat CdS and ZnS shells on nanocrystals for manipulating the structure, surface and optical characterizations.