Remote Optically Controlled Modulation of Catalytic Properties of Nanoparticles through Reconfiguration of the Inorganic/Organic Interface

Randy L. Lawrence, Billy Scola, Yue Li, Chang Keun Lim, Yang Liu, Paras N. Prasad, Mark T. Swihart, Marc R. Knecht

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

We introduce here a concept of remote photoinitiated reconfiguration of ligands adsorbed onto a nanocatalyst surface to enable reversible modulation of the catalytic activity. This is demonstrated by using peptide-ligand-capped Au nanoparticles with a photoswitchable azobenzene unit integrated into the biomolecular ligand. Optical switching of the azobenzene isomerization state drives rearrangement of the ligand layer, substantially changing the accessibility and subsequent catalytic activity of the underlying metal surface. The catalytic activity was probed using 4-nitrophenol reduction as a model reaction, where both the position of the photoswitch in the peptide sequence and its isomerization state affected the catalytic activity of the nanoparticles. Reversible switching of the isomerization state produces reversible changes in catalytic activity via reconfiguration of the biomolecular overlayer. These results provide a pathway to catalytic materials whose activity can be remotely modulated, which could be important for multistep chemical transformations that can be accessed via nanoparticle-based catalytic systems.

Original languageEnglish
Pages (from-to)9470-9477
Number of pages8
JournalACS Nano
Volume10
Issue number10
DOIs
Publication statusPublished - Oct 25 2016

Keywords

  • Au nanoparticles
  • biointerface reconfiguration
  • catalysis
  • peptides
  • photoactivated switch

ASJC Scopus subject areas

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

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