期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 61, 期 34, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202207300
关键词
Atomically Dispersed Metals; Fluorescence Enhancement; Molybdenum Disulfide; Non-Radiative Recombination; Quantum Dots
资金
- National Key Research and Development Program of China [2017YFA0700500, 2020YFA0406104]
- National Natural Science Foundation of China [21635004, 22073045, 21327902]
- Excellent Research Program of Nanjing University [ZYJH004]
- Fundamental Research Funds for the Central Universities
Fluorescence efficiency of molybdenum disulfide quantum dots can be enhanced by single-atom metal modification, which improves their economic efficiency and stability.
To enhance the fluorescence efficiency of semiconductor nanocrystal quantum dots (QDs), strategies via enhancing photo-absorption and eliminating non-radiative relaxation have been proposed. In this study, we demonstrate that fluorescence efficiency of molybdenum disulfide quantum dots (MoS2 QDs) can be enhanced by single-atom metal (Au, Ag, Pt, Cu) modification. Four-fold enhancement of the fluorescence emission of MoS2 QDs is observed with single-atom Au modification. The underlying mechanism is ascribed to the passivation of non-radiative surface states owing to the new defect energy level of Au in the forbidden band that can trap excess electrons in n-type MoS2, increasing the recombination probability of conduction band electrons with valence band holes of MoS2. Our results open an avenue for enhancing the fluorescence efficiency of QDs via the modification of atomically dispersed metals, and extend their scopes and potentials in a fundamental way for economic efficiency and stability of single-atom metals.
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