Journal
NANOTECHNOLOGY
Volume 29, Issue 30, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6528/aac124
Keywords
L-cysteine; mercaptopropionic acid; ZnS quantum dots; co-capped; dual emissions
Funding
- National Natural Science Foundation of China [51372201, 21476183, 21676213]
- China Postdoctoral Science Foundation [2016M600809]
- Natural Science Basic Research Plan in Shaanxi Province of China [2017JM2026]
- Open Research Fund of State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Chinese Academy of Sciences [T151702]
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In this paper, L-cysteine (L-cys) and mercaptopropionic acid (MPA) co-capped ZnS quantum dots (QDs) with dual emissions have been successfully synthesized by a one-pot aqueous-phase synthesis method. The intensities of the dual emissions could be controlled by regulating the molar ratio of L-cys to MPA, and the fluorescence color also turned from blue to yellow accordingly. The relationship between the ligands and fluorescence was investigated and the results indicated that L-cys could cause two emissions and MPA improved the emission intensity. In addition, the L-cys-MPA co-capped ZnS QDs showed high photostability under UV irradiation. Therefore, the L-cys-MPA co-capped ZnS QDs, which show the dual emissions and tunable emission intensities, have great potentials for use in ratiometric fluorescence sensors and multicolor bioimaging.
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