Regensburg 2025 – scientific programme

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O: Fachverband Oberflächenphysik

O 72: Poster Plasmonics and Nanooptics: Light-Matter Interaction, Spectroscopy

O 72.5: Poster

Wednesday, March 19, 2025, 18:00–20:00, P2

Single particle sample with gold nanorods for micro-spectroscopy — •Alexandra Faber — Institut für Physik und Astronomie, Universität Potsdam, Deutschland

Nobel metal nanostructures show great potential for photocatalytical applications due to their broadband plasmonic absorption across the visible spectrum. Chemical reactions taking place at surfaces can be accelerated by several effects, including charge transfer and local heating. As one important factor, the accumulation of charges on the particle during a reaction process, is expected to have a large influence on the charge transfer process. In order to better understand the effects of photocharging of gold nanorods (GNR), possible electron transfer between individual GNRs and the substrate, single nanoparticles are studied by optical micro-spectroscopy. The samples are investigated by dark-field as well as scanning electron microscopy and must therefore fulfill different requirements. This includes that the sample must provide the necessary criteria such as conductivity and light transmission in order to be observed with both microscopy methods. At the same time, it should be possible to rediscover individual GNRs and the distance between the particles has to be large enough to allow spectroscopy of individual GNRs. We show the development and improvement of the sample preparation procedure as well as first recorded dark-field scattering spectra and fluorescence spectra of single GNRs.

Keywords: scanning electron microsopy; dark-field microscopy; gold nanorods; single particle