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MO: Fachverband Molekülphysik

MO 3: Electronic I

MO 3.6: Talk

Monday, March 14, 2022, 18:00–18:15, MO-H5

Laser Spectroscopy of Shell-Isolated Au Nanoparticles Functionalized with Rhodamine B Molecules in Helium Nanodroplets — •Roman Messner, Wolfgang E. Ernst, and Florian Lackner — Institute of Experimental Physics, Graz University of Technology, Petersgasse 16, 8010 Graz, Austria

Nanoparticles comprising three different materials in a core@shell@shell configuration are synthesized in cold helium droplets by sequential doping. Rhodamine B molecules form complexes in helium droplets that give rise to a strong fluorescence upon laser excitation, which enables an in-situ investigation of the synthesized structures. In the presence of a Au core, the rhodamine B fluorescence is quenched due to excitation transfer from excited shell molecules to the Au particle. The addition of an intermediate hexane layer inhibits the contact between Au core and RB shell, which results in the recovery of the fluorescence.