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Photogenerated Carrier Separation and Localized Surface Plasmon Resonance in MoS2/Metal Nanocomposites: Implications for Photoelectric Devices.
- Source :
- ACS Applied Nano Materials; 6/14/2024, Vol. 7 Issue 11, p12806-12820, 15p
- Publication Year :
- 2024
-
Abstract
- Integrating noble metals with semiconductors is a viable approach to enhancing the photoelectric conversion efficiency of samples. The combination of metals with semiconductors has found widespread application in the field of optoelectronics and devices. Herein, metal (M = Ag/Cu) and MoS<subscript>2</subscript> (MoS<subscript>2</subscript>/M) nanocomposites were successfully synthesized using magnetron sputtering and hydrothermal two-step methods. The sizes and morphologies of the metals can be adjusted by controlling the sputtering time. Metals Ag and Cu were anchored onto defective MoS<subscript>2</subscript> nanomaterials, serving as photoanodes and light absorbers, respectively. The vacancy-induced defect structure, along with the synergistic effect of the interface and size, can simultaneously regulate the charge-carrier dynamics and the band structure of MoS<subscript>2</subscript>/M nanocomposites. The transient photocurrent responses and the electrochemical impedance spectroscopy results demonstrate the excellent photoelectrochemical (PEC) properties of the MoS<subscript>2</subscript>/M nanocomposites. A finite-difference time-domain simulation reveals that the strong plasmonic electromagnetic field generated by metal can significantly enhance the energy-band transition rate of neighboring materials and improve photogenerated carrier separation. Compared with pure MoS<subscript>2</subscript>, MoS<subscript>2</subscript>/M nanocomposites exhibit enhanced nonlinear-optical (NLO) behavior. This improvement stems from an effective charge separation, which is facilitated by a synergistic interaction between the electric field and the plasmonic magnetic field. Density functional theory calculations indicate a decrease in the energy of the Mo d orbital, which contributes to the acceptance of d electrons from Ag/Cu. The exceptional performance of MoS<subscript>2</subscript>/M nanocomposites is primarily attributed to the occupancy of Mo d orbitals, driven by the intense interaction among MoS<subscript>2</subscript> and Ag/Cu optimal combination. This work offers valuable insights into the design of heterojunctions with abundant surface/interface contact and defect features to enhance tunable electron-transfer kinetics. Such advancements pave the way for achieving a high NLO conversion efficiency and the development of efficient PEC anode materials. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 25740970
- Volume :
- 7
- Issue :
- 11
- Database :
- Complementary Index
- Journal :
- ACS Applied Nano Materials
- Publication Type :
- Academic Journal
- Accession number :
- 177927515
- Full Text :
- https://doi.org/10.1021/acsanm.4c01222