Plasmonic hot-carrier-mediated tunable photochemical reactions

Yu Zhang, Tammie Nelson, Sergei Tretiak, Hua Guo, George C. Schatz

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Hot-carrier generation from surface plasmon decay has found applications in many branches of physics, chemistry, materials science, and energy science. Recent reports demonstrated that the hot carriers generated from plasmon decay in nanoparticles can transfer to attached molecules and drive photochemistry which was thought impossible previously. In this work, we have computationally explored the atomic-scale mechanism of a plasmonic hot-carrier-mediated chemical process, H2 dissociation. Numerical simulations demonstrate that, after photoexcitation, hot carriers transfer to the antibonding state of the H2 molecule from the nanoparticle, resulting in a repulsive-potential-energy surface and H2 dissociation. This process occurs when the molecule is close to a single nanoparticle. However, if the molecule is located at the center of the gap in a plasmonic dimer, dissociation is suppressed due to sequential charge transfer, which efficiently reduces occupation in the antibonding state and, in turn, reduces dissociation. An asymmetric displacement of the molecule in the gap breaks the symmetry and restores dissociation when the additional charge transfer is significantly suppressed. Thus, these models demonstrate the possibility of structurally tunable photochemistry via plasmonic hot carriers.

Original languageEnglish
Pages (from-to)8415-8422
Number of pages8
JournalACS nano
Volume12
Issue number8
DOIs
Publication statusPublished - Aug 28 2018

Keywords

  • H dissociation
  • charge transfer
  • hot carriers
  • photocatalysis
  • plasmonic energy conversion
  • plasmonics

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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