Dresden 2017 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 63: Nanomaterials II

MM 63.5: Vortrag

Donnerstag, 23. März 2017, 13:00–13:15, IFW D

Thermal and Photothermal Reshaping of Gold Nanorods — •Phillip Witthöft¹, Christian Strelow¹, Tobias Kipp¹, Gerhard Grübel², and Alf Mews¹ — ¹Universität Hamburg, Institut für Physikalische Chemie, Hamburg, Deutschland — ²Deutsches Elektronen-Synchroton, Hamburg, Deutschland

Gold nanorods are cylindrical structures of colloidal gold with very interesting optical properties because of their shape dependent plasmonic resonances. The location of these plasmonic resonances in their extinction spectrum hardly depend on the aspect ratio of the nanorods. Consequently, structural changes such as melting or surface rearragement can be observed on the nanoscale following the location of the surface plasmon resonance. Here, we present different techniques to use thermal and photothermal energy to induce shape changes in gold nanorods even below the melting point. We use optical spectroscopy to track structural changes via the plasmonic resonances and compare them with transmission electron microscope images of the generated nanostructures. Based on our observation we discuss the possibilities of thermal reshaping on the nanoscale.