The quality and stability of CdHgTe/ZnTe with different ligands
In this paper,strong photoluminescence near-infrared(NIR)-emitting CdHgTe/ZnTe nanocrystals were synthesized using different thiol ligands 3-mercaptopropionic acid(MPA),L-Cysteine(L-Cys),and gluta-thione(GSH).This research utilizes a novel temperature-controlled microwave-assisted methodology via freez-ing-thawing(F-T)progress to synthesize superior CdHgTe/ZnTe core-shell nanocrystals.The study reveals that the photoluminescence quantum yields are markedly influenced by the synthesis parameters,including component types,concentration levels,and the choice of surface ligands.Different technologies including UV-vis,photoluminescence spectroscopy,transmission electron microscopy,powder X-ray diffraction and X-ray photoelectron spectroscopy were employed to characterize the as-prepared nanocrystals.The results showed that enhanced photoluminescence yield is primarily due to the low lattice mismatch(6％)between the CdHgTe core and the ZnTe shell materials,which significantly boosts the fluorescence stability and presents a low density of defects in the shell.Furthermore,the core-shell CdHgTe/ZnTe nanocrystals were successfully applied for fixed cells.The biocompatible ligands capped nanocrystals with bright fluorescence showed negligible photobleaching in fixed cells even after 40 min UV irradiation.This indicates that core-shell nanocrystals capped with L-Cyste-ine and Glutathione possess remarkably high resistance to photobleaching and oxidation.
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