Berlin 2024 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 71: Poster: Plasmonics and Nanooptics

O 71.22: Poster

Mittwoch, 20. März 2024, 18:00–20:00, Poster D

Polarization sensitive plasmonic induced chemical reaction observed by chiral SERS — •Shashank Gahlaut¹, Ki Tae Nam², Alexander Govorov³, and Ilko Bald¹ — ¹Institute of Chemistry, University of Potsdam, Potsdam-14476 Germany — ²Department of Materials Science and Engineering, Seoul National University, Seoul 08826, S. Korea — ³Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, China Department of Physics and Astronomy, Ohio University, Athens, Ohio 45701, United States

Plasmonic induced chemical reactions on nanoparticles has attracted the attention of community of material science. Metallic nanoparticles possess the potential of confining the light into sub-wavelength region. The surface plasmon excitation enables the enhancement of local electric field in the close vicinity of particles. The decay of surface plasmons results into the formation of hot charge carriers and localized heat. Solar to chemical energy conversion has become the most attractive application in photocatalysis by plasmonic NPs. Here, we have observed polarization sensitive photochemistry on chemically synthesized chiral plasmonic nanocubes (gold helicoids, AuNC). Dehalogenation of 8-Bromoadenine (8-BrAde), a radiosensitizer, by metallic hot electrons has been targeted as a model chemical reaction. Left-handed AuNC show higher rate of reaction with LCP light as compared to opposite combination of L-AuNC and RCP light. Photochemical g-factor was found to be very large as compare to the optical g-factor. This g factor increases with the increase in laser power.

Keywords: Plasmonic chemistry; Chirality; Gold; SERS; Dehalogenation