4.8 Article

Enhanced Light-Matter Interactions in Self-Assembled Plasmonic Nanoparticles on 2D Semiconductors

Journal

SMALL
Volume 14, Issue 47, Pages -

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201802949

Keywords

localized surface plasmon resonance; photoluminescence; Raman; self-assembly; silver nanoparticles; transition-metal dichalcogenides

Funding

  1. Institute for Basic Science of Korea [IBS-R011-D1]
  2. Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [2018R1D1A1A02046206]

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Two-dimensional (2D) transition-metal dichalcogenide (TMD) monolayers of versatile material library are spotlighted for numerous unexplored research fields. While monolayer TMDs exhibit an efficient excitonic emission, the weak light absorption arising from their low dimensionality limits potential applications. To enhance the light-matter interactions of TMDs, while various plasmonic hybridization methods have been intensively studied, controlling plasmonic nanostructures via self-assembly processes remains challenging. Herein, strong light-matter interactions are reported in plasmonic Ag nanoparticles (NPs) hybridized on TMDs via an aging-based self-assembly process at room temperature. This hybridization is implemented by transferring MoS2 monolayers grown via chemical vapor deposition onto thin-spacer-covered Ag films. After a few weeks of aging in a vacuum desiccator, the Ag atoms in the heterolayered film diffuse to the MoS2 layers through a SiO2 spacer and self-cluster onto MoS2 point defects, resulting in the formation of Ag-NPs with an estimated diameter of approximate to 50 nm. The photoluminescence intensities for the Ag-NP/MoS2 hybrids are enhanced up to 35-fold compared with bare MoS2 owing to the local field enhancement near the plasmonic Ag-NPs. The localized surface plasmon resonances modes of this hybrid are systematically investigated via numerical simulations and dark-field scattering microscopy.

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