期刊
JOURNAL OF FLUORESCENCE
卷 23, 期 4, 页码 793-798出版社
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10895-013-1212-z
关键词
Quantum dot; Luminescence; Photoinduced electron transfer; Chemodosimeter
资金
- University of Malta
- Acadia University
- European Cooperation in Science and Technology [COST CM1005]
A CdSe-ZnS quantum dot (QD) has been surface functionalised by a place exchange reaction with p-mercaptomethyl benzoate synthesized by a three-step procedure. The resulting lumophore-spacer-receptor QD-conjugate was characterized by IR, UV-visible and fluorescence spectroscopy. The emission profile of the QD reveals a narrow emission peak centred at 542 nm. Addition of hydroxide to the solution containing the QD-conjugate results in quenching of the original fluorescence, which is attributed to a photoinduced electron transfer reaction from the electron-rich benzoate moiety to the QD valence band. This is the first reported example of fluorescent quenching of a CdSe-ZnS QD luminescence by an aryl carboxylate moiety.
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