Journal
NEW JOURNAL OF CHEMISTRY
Volume 42, Issue 19, Pages 15743-15749Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8nj02864h
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Funding
- National Natural Science Foundation of China [51672248]
- Public Project of Zhejiang Province [2017C33172, 2017C31049]
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Aqueous N-acetyl-L-cysteine (NAC)-capped CdTe quantum dots (QDs) are prepared in one step by using sodium tellurite as a tellurium source and sodium borohydride as a reductant. The fluorescence (FL) emissions of the QDs are tunable between 514 and 753 nm. The effects of NAC/Cd, Cd/Te molar ratios, and pH values on the photoluminescence quantum yield (PLQY) of the QDs have been systematically studied. They display a high PLQY of up to 52.83%, with uniform narrow-size distributions. Furthermore, the obtained green- and red-emissive CdTe QDs are applied to explore the impact of QD size on the FL response toward glutathione (GSH) by a turn-on strategy. The results imply that the large-sized CdTe QDs with red FL are more suitable for detecting GSH than the small-sized QDs with green FL. The possible mechanism is also investigated.
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