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Controllable hot electron transfer in the Ag/MoO3 layer by layer system: Thickness-dependent MoO3 layer.

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Fabricating silver/molybdenum trioxide (Ag/MoO3) nanostructures on polystyrene arrays enhances surface-enhanced Raman scattering (SERS). Optimizing MoO3 thickness controls hot electron transfer for catalytic monitoring.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Chemistry

Background:

  • Surface-enhanced Raman scattering (SERS) is a powerful analytical technique.
  • Controlling nanostructure properties is crucial for optimizing SERS activity.
  • Hot electron transfer plays a significant role in plasmon-enhanced photocatalysis.

Purpose of the Study:

  • To fabricate and characterize Ag/MoO3 nanostructures on polystyrene arrays.
  • To investigate the effect of MoO3 layer thickness on SERS activity.
  • To understand the mechanism of hot electron transfer in enhancing catalytic reactions.

Main Methods:

  • Layer-by-layer sputtering deposition of Ag and MoO3 on polystyrene arrays.
  • Controlled variation of MoO3 layer thickness via sputtering power.
  • SERS measurements using 4-aminothiophenol (PATP) as a probe molecule.

Main Results:

  • Ag/MoO3@PS exhibited excellent SERS activity.
  • SERS intensity with a 2 nm MoO3 layer was comparable to pure Ag@PS.
  • Hot electron injection from Ag to MoO3 enhanced photocatalysis, enabling SERS detection of coupled PATP.
  • Increasing MoO3 thickness to 9 nm blocked hot electron transport, decreasing SERS intensity and the b2 mode of PATP.

Conclusions:

  • The thickness of the MoO3 layer critically influences hot electron transfer and SERS activity.
  • This study offers insights into controlling hot electron reduction for catalytic process monitoring.
  • Tailoring nanostructure interfaces provides a pathway for advanced SERS applications.