Berlin 2018 – scientific programme
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O: Fachverband Oberflächenphysik
O 56: Plasmonics and nanooptics: Light-matter interaction, spectroscopy IV
O 56.3: Talk
Wednesday, March 14, 2018, 11:00–11:15, MA 041
Plasmon enhanced nano-chemistry with gold nanostars — •Theo Lohmüller1, Christian Mühlbauer1, Wolf Knöller1, Christoph Maier1, Lakshmi Polavarapu1, Jochen Feldmann1, and Ana Huergo2 — 1Chair for Photonics and Optoelectronics, Physics Department and CeNS, Ludwig-Maximilians-Universität, Munich, Germany — 2Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas, Universidad Nacional de La Plata, La Plata, Argentina
Plasmonic gold nanostars with radially distributed spikes display strong field enhancement at the sharp tips upon excitation with light [1]. Non-radiative decay of the highly localized surface plasmons in the tip region can lead to the generation of hot-electrons that can transfer to, for example, nearby molecules or semiconductor particles.
Here, we report on the use of gold nanostars for controlling hot-carrier induced nano-chemical reactions. Bare gold nanostars with a core size of approximately 30 nm are synthesized in a surfactant-free approach. The stars are covered with a self-assembled monolayer of molecules that undergo a reduction by electron uptake upon plasmon excitation. The efficiency and localization of this hot-carrier driven reaction is monitored and characterized by surface enhanced Raman scattering (SERS).
[1] Hrelescu, T.K. Sau, A.L. Rogach, F. Jäckel, J. Feldmann; Appl. Phys. Lett. 94 (15), 153113 (2009)