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O: Fachverband Oberflächenphysik
O 76: Plasmonics and Nanooptics V: Tunable Structures and Nanoparticles (joint session O/CPP)
O 76.11: Vortrag
Mittwoch, 18. März 2020, 18:00–18:15, WIL A317
Helium Droplet Mediated Synthesis of Rhodamine B Functionalized Au Nanoparticles — Roman Messner1, Harald Fitzek2, Wolfgang E. Ernst1, and •Florian Lackner1 — 1Institute of Experimental Physics, Graz University of Technology, Petersgasse 16, 8010 Graz, Austria — 2Institute of Electron Microscopy and Nanoanalysis & Graz Centre for Electron Microscopy, Graz University of Technology, Steyrergasse 17, 8010 Graz, Austria
Helium nanodroplets provide a new route for the synthesis of plasmonic nanoparticles. [1] Metal atoms are picked up by the droplets and agglomerate to particles, subsequent deposition on surfaces allows for the fabrication of plasmonic nanoparticle films without any solvents or surfactants. We show that the approach can also be used to produce complexes consisting of a plasmonic nanoparticle surrounded by a shell of molecules on the example of Au particles and rhodamine B. Surface enhanced Raman spectroscopy (SERS) indicates that the formed complexes stay intact after deposition. Our current efforts are geared towards the study of interactions between plasmon oscillations in the metal particles and the attached molecules. Therefore, experiments are carried out in-situ, while the particles are solvated in the helium droplets, employing laser induced fluorescence spectroscopy. The rhodamine B dye molecules are excited by a 532 nm laser, the detected fluorescence signal is found to be strongly quenched as soon as Au nanoparticles are added to the helium droplet.
[1]...Eur. Phys. J. D, 73 (5), 104 (2019)