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Peng Zhang1, Mamoru Fujitsuka1, Tetsuro Majima1

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This study demonstrates efficient solar energy conversion using plasmon-induced hot electrons from gold nanostructures transferred to molybdenum disulfide for hydrogen evolution reactions.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Photocatalysis

Background:

  • Plasmonic nanostructures are key for harnessing solar energy via hot electrons.
  • Understanding hot electron dynamics in photocatalysis is crucial for efficient solar energy conversion.
  • Two-dimensional semiconductors are promising electron acceptors in photocatalytic systems.

Purpose of the Study:

  • To investigate plasmon-induced interfacial hot electron transfer from anisotropic gold nanostructures to monolayer molybdenum disulfide (MoS2).
  • To explore the role of this electron transfer in the hydrogen evolution reaction (HER).
  • To provide the first example of hot electron transfer from anisotropic gold nanostructures to 2D materials.

Main Methods:

  • Utilized anisotropic gold nanostructures as electron donors and monolayer MoS2 as electron acceptors.
  • Employed single-particle confocal fluorescence microscopy for observation.
  • Performed finite-difference-time-domain (FDTD) simulations for computational analysis.
  • Conducted time-resolved transient absorption measurements to study electron dynamics.

Main Results:

  • Anisotropic gold nanostructures showed strong plasmon resonance, enabling efficient interfacial hot electron transfer to MoS2.
  • A long-lived charge-separated state (800 ps) was achieved, crucial for efficient HER.
  • Demonstrated successful plasmon-induced hot electron transfer from anisotropic Au to 2D materials.

Conclusions:

  • The study successfully unveiled plasmon-induced interfacial hot electron transfer from anisotropic gold nanostructures to monolayer MoS2.
  • This process is vital for efficient hydrogen evolution reaction (HER) in solar energy conversion.
  • Paved the way for novel plasmonic photocatalyst designs utilizing 2D materials.