Hannover 2016 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 16: Molecular Clusters
MO 16.6: Vortrag
Donnerstag, 3. März 2016, 12:45–13:00, f142
Tuning the optical properties of diamondoids through plasmonics — •Andre Knecht1, Tobias Zimmermann1, Andrea Merli1, Merle Röhr2, Jens Petersen2, Roland Mitric2, Thomas Möller1, and Torbjörn Rander1 — 1Institut für Optik und Atomare Physik, Technische Universität Berlin — 2Institut für Physikalische und Theoretische Chemie, Universität Würzburg
Diamondoids, subnanometer-sized carbon-cages, show interesting properties like negative electron affinity and intrinsic photoluminescence in the UV regime [1,2]. The feasibility of functionalization, as well as the size and shape selectivity of the diamondoids, gives rise to numerous possibilities to tune their optical properties. Hence, these molecular diamonds are ideal to investigate a size regime where a transition from molecular to bulk-like optical properties takes place.
Moreover, diamondoid properties can be modified through adsorption on metal surfaces [2]. Adjusting the local environment of diamondoids through the proximity of metal clusters, we can tune the metal plasmon resonance to the radiative transitions of the diamondoid [3]. To investigate these plasmon resonance coupling effects, we use ion yield spectroscopy. First ion yield spectra of Au-adamantanethiol-hybrids show significant changes in the UV absorption cross section and represent an important step towards the systematic development of novel nanoscopic plasmonic hybrid systems.
[1] R. Richter, et al., Phys. Chem. Chem. Phys. 17.6 (2015): 4739-4749. [2] W. Clay, et al., Nano letters 9.1 (2008): 57-61. [3] P. Anger, et al., Phys. Rev. Lett. 96, 113002 (2006).