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Monitoring plasmonic hot-carrier chemical reactions at the single particle level


Plasmon excitation in metal nanoparticles triggers the generation of highly energetic charge carriers that - properly manipulated and exploited - can mediate chemical reactions. Single-particle techniques are key to unearth the underlying mechanisms of hot-carrier generation, transport and injection as well as to disentangle the role of the temperature increase and the enhanced near-field at the nanoparticle-molecule interface. Gaining a nanoscopic insight of these processes and their interplay could aid in the rational design of plasmonic photocatalysts. Here, we present three different approaches to monitor hot-carrier reactivity at the single-particle level. We use a combination of dark-field microscopy and photo-electrochemistry to track a hot-hole driven reaction on a single Au nanoparticle. We image hot-electron reactivity with sub-particle spatial resolution using nanoscopy techniques. Finally, we push the limits looking for a hot-electron induced chemical reaction that generates a fluorescent product, which should enable imaging of active plasmonic photocatalysis at the single-particle and single-molecule levels.

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Publication details

The article was accepted on 24 Oct 2018 and first published on 24 Oct 2018

Article type: Paper
DOI: 10.1039/C8FD00138C
Citation: Faraday Discuss., 2018, Accepted Manuscript
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    Monitoring plasmonic hot-carrier chemical reactions at the single particle level

    S. Simoncelli, E. Pensa, T. Brick, J. Gargiulo, A. Lauri, J. Cambiasso, Y. Li, S. A. Maier and E. Cortes, Faraday Discuss., 2018, Accepted Manuscript , DOI: 10.1039/C8FD00138C

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