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Energy transfer dynamics between carbon quantum dots and molybdenum disulfide revealed by transient absorption spectroscopy.
- Source :
- Chinese Journal of Chemical Physics (1674-0068); Oct2023, Vol. 36 Issue 5, p503-508, 6p
- Publication Year :
- 2023
-
Abstract
- Zero-dimensional environmentally friendly carbon quantum dots (CQDs) combined with two-dimensional materials have a wide range of applications in optoelectronic devices. We combined steady-state and transient absorption spectroscopies to study the energy transfer dynamics between CQDs and molybdenum disulfide (MoS<subscript>2</subscript>). Transient absorption plots showed photoinduced absorption and stimulated emission features, which involved the intrinsic and defect states of CQDs. Adding MoS<subscript>2</subscript> to CQDs solution, the lowest unoccupied molecular orbital of CQDs transferred energy to MoS<subscript>2</subscript>, which quenched the intrinsic emission at 390 nm. With addition of MoS<subscript>2</subscript>, CQD-MoS<subscript>2</subscript> composites quenched defect emission at 490 nm and upward absorption, which originated from another energy transfer from the defect state. Two energy transfer paths between CQDs and MoS<subscript>2</subscript> were efficiently manipulated by changing the concentration of MoS<subscript>2</subscript>, which laid a foundation for improving device performance. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 16740068
- Volume :
- 36
- Issue :
- 5
- Database :
- Complementary Index
- Journal :
- Chinese Journal of Chemical Physics (1674-0068)
- Publication Type :
- Academic Journal
- Accession number :
- 173458659
- Full Text :
- https://doi.org/10.1063/1674-0068/cjcp2208129