期刊
FRONTIERS IN MATERIALS
卷 8, 期 -, 页码 -出版社
FRONTIERS MEDIA SA
DOI: 10.3389/fmats.2021.744275
关键词
WS2; resonance couplings; gold nanorods; plasmon resonances; chemical tunings
资金
- National Key Basic Research Program of China [2019YFA0210203]
- National Natural Science Foundation of China [91963205, 11904420]
- Guangdong Basic and Applied Basic Research Foundation [2020A1515011329]
- Changjiang Young Scholar Program
Chemical tuning of resonance coupling in heterostructures consisting of gold nanorods and monolayer WS2 can enhance the exciton transition strength and evolve resonance coupling from weak to strong coupling states. This highlights the potential of chemical treatment as an efficient technique for tailoring the interactions between plasmonic nanostructures and 2D semiconductors.
Resonance coupling between plasmonic resonances in metallic nanostructures and excitons in two-dimensional (2D) semiconductors has attracted much recent attention. The 2D semiconductor excitons are sensitive to external stimulus, enabling active tuning on the resonance couplings by physical, such as applying electrostatic gating, thermal scanning, etc., or chemical approaches. Among the others, chemical tuning approach has the advantage of facile implementation, high efficiency, and being capable of large-area tuning. Here, we report on chemical tuning of resonance coupling in heterostructures consisted of individual gold nanorods integrated with monolayer WS2. We showed that by incubating the heterostructures into a bis (trifluoro-methane) sulfonimide (TFSI) solution, the exciton transition strength of the WS2 will be enhanced significantly. As a result, the resonance coupling in the heterostructures evolved from a weak coupling regime to a strong coupling one, with the mode splitting energy increases from 94.96 to 105.32 meV. These findings highlight the potential of chemical treatment as an efficient technique for tailoring the interactions between plasmonic nanostructures and 2D semiconductors.
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