文献类型：期刊文献

英文题名：Layer-by-layer aqueous synthesis, characterization and fluorescence properties of type-II CdTe/CdS core/shell quantum dots with near-infrared emission (Publication with Expression of Concern. See vol. 10, pg. 37807, 2020)

作者：Gui, Rijun[1,2];An, Xueqin[1]

机构：[1]E China Univ Sci & Technol, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China;[2]Shanghai Jiao Tong Univ, Sch Chem & Chem Engn, Shanghai 200240, Peoples R China

年份：2013

卷号：3

期号：43

起止页码：20959

外文期刊名：RSC ADVANCES

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000325950600180)】；

基金：This work was supported by grants from the National High-Tech Research and Development Plan of China (863 plan, 2011AA06A107), the National Natural Science Foundation of China (21273073 and 21073063), the Nature Science Keystone Foundation of Shanghai (08jc1408100) and the Fundamental Research Funds for the Central Universities of China (WK0913002).

语种：英文

摘要：A layer-by-layer epitaxial method was developed to synthesize water-soluble, near-infrared (NIR)-emitting type-II core/shell CdTe/CdS quantum dots (QDs) via employing glutathione-capped CdTe QDs as core templates, CdCl2 and thiourea as shell precursors. CdTe/CdS type-II nanostructure yields the QDs with NIR emission by varying the size of CdTe cores and the thickness of CdS shells. Compared to CdTe core QDs, CdTe/CdS core/shell QDs exhibit remarkable red-shifted spectra, and the corresponding emission maximum wavelength can span from 626 to 809 nm. Surface passivation of ZnS shell with a substantially wide bandgap restrains the excitons within CdTe/CdS QDs interface and isolates them from aqueous solution. This passivation therefore improves the photoluminescence (PL) efficiency of the CdTe/CdS nanostructure, including PL quantum yield, lifetime and photo-stability/catalytic activity. Through comprehensive research on their core/shell nanostructures, the CdTe/CdS QDs obtained from hydrothermal shell-coating route, show good monodispersity, lattice-mismatched heterostructure and NIR-emission properties, offering a great potential for biological or biomedical applications.