Regensburg 2025 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 79: Ultrafast Electron Dynamics III
O 79.7: Vortrag
Donnerstag, 20. März 2025, 12:00–12:15, H2
Following charge-transfer between plasmonic NPs and adsorbed molecules by time-resolved IR spectroscopy — •Daniel Sandner1, Katrin Schulz1, Andrei Stefancu2, Reinhard Kienberger1, Emiliano Cortes2, and Hristo Iglev1 — 1Lehrstuhl für Laser- und Röntgenphysik E11, TUM, James-Franck Str 1, 85748 Garching — 2Fakultät für Physik, LMU München
Plasmonic Nanoparticles can efficiently convert light in a broad range into hot charge carriers, which can be subsequently transferred to molecules or semiconductors for photocatalytic processes. The role of charge-carrier-mediated or thermal reaction pathways is still under debate. Here, we use time-resolved IR spectroscopy between 1200-3000 cm-1 as a sensitive probe for free charges and study the dynamics of different molecules attached to silver NPs. Charge transfer is only observed for resonant excitation of the plasmon resonance and in the presence of attached molecules. Furthermore, we find a correlation between the lifetime of transferred charges and the chemical reactivity.
Keywords: Plasmonics; Time-resolved Spectroscopy; Charge transfer; Adsorbates; midinfrared