%A Guanjiao CHEN, Wenjin ZHANG, Xinhua ZHONG, %T Single-source precursor route for overcoating CdS and ZnS shells around CdSe core nanocrystals %0 Journal Article %D 2010 %J Front. Chem. China %J Frontiers of Chemistry in China %@ 1673-3495 %R 10.1007/s11458-010-0106-8 %P 214-220 %V 5 %N 2 %U {https://journal.hep.com.cn/fcc/EN/10.1007/s11458-010-0106-8 %8 2010-06-05 %X We reported a facile route for overcoating CdS and ZnS shells around colloidal CdSe core nanocrystals. To synthesize such double shelled core/shell nanocrystals, first, CdSe core nanocrystals were prepared in a much “greener” and cheap route, which did not involve the use of hazardous and expensive trioctylphosphine. Then, a low-cost and labor-saving route was adopted for the CdS and ZnS shell growth with the use of thermal decomposition of commercial available air stable single-source precursors cadmium diethyldithiocarbamate and zinc diethyldithiocarbamate in a non-coordinating solvent at intermediate temperatures. Powder X-ray diffraction patterns and transmission electron microscopy images confirm the epitaxial growth of the shell in the core/shell nanocrystals. The photoluminescence quantum yield of the resulting CdSe/CdS/ZnS core/shell nanocrystals can be as high as 90% in organic media and up to 60% after phase transfer into aqueous media. By varying the size of CdSe cores, the emission wavelength of the obtained core/shell nanostructures can span from 554 to 636 nm.