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Direct hot-carrier transfer in plasmonic catalysis.

Priyank V Kumar1, Tuomas P Rossi2, Mikael Kuisma3

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This study explores direct hot-electron transfer in plasmonic catalysis. Researchers used calculations to show this process enhances chemical reactions on silver nanoparticles with carbon monoxide, depending on the molecule's position.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Surface Science

Background:

  • Plasmonic metal nanoparticles concentrate light energy, enhancing surface chemical reactions.
  • The direct-transfer process, where plasmons excite carriers from metal to adsorbate, is crucial but poorly understood for catalysis.

Purpose of the Study:

  • To investigate the direct-transfer process at a model metal-adsorbate interface.
  • To understand how hot-electron transfer from silver to carbon monoxide influences plasmonic catalysis.

Main Methods:

  • Utilized time-dependent density-functional theory (TDDFT) calculations.
  • Modeled a silver nanoparticle (Ag147) interacting with a carbon monoxide (CO) molecule.
  • Analyzed the direct hot-electron transfer from silver to CO's unoccupied molecular orbitals.

Main Results:

  • Observed direct hot-electron transfer from silver nanoparticle occupied states to CO unoccupied molecular orbitals.
  • Quantified the probability of the direct-transfer process.
  • Demonstrated that the transfer probability is dependent on the CO adsorption site on the silver nanoparticle.

Conclusions:

  • The direct-transfer process is a viable mechanism for plasmon-enhanced catalysis.
  • Adsorption site engineering is critical for optimizing hot-electron transfer efficiency.
  • Findings provide insights for designing advanced metal-molecule interfaces for plasmonic catalysis.