Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 43: Plasmonics and Nanooptics IV
O 43.6: Vortrag
Mittwoch, 13. März 2013, 11:45–12:00, H31
Plasmonic Smart Dust for Probing Local Chemical Reactions — •Andreas Tittl1, Xinghui Yin1, Harald Giessen1, Xiang-Dong Tian2, Christian Kremers3, Dmitry N. Chigrin3, Zhong-Qun Tian2, and Na Liu4 — 14th Physics Institute and Research Center Scope, University of Stuttgart — 2State Key Laboratory for Physical Chemistry of Solid Surfaces and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University — 3Institute of High-Frequency and Communication Technology, Faculty of Electrical, Information and Media Engineering, University of Wuppertal — 4Max Planck Institute for Intelligent Systems, Stuttgart
We demonstrate an all-optical probing technique based on plasmonic smart dust for monitoring local chemical reactions in real time. Our smart dust consists of silica shell-isolated gold nanoparticles which can work as strong light concentrators and optically report subtle changes at their pinning sites on the probed surface during reaction processes. In particular, we investigate the hydrogen dissociation and subsequent absorption in neighboring palladium films with both ,,dust-on-film`` and ,,film-on-dust`` platforms. Our single particle scattering measurements illustrate the ability of this technique to optically resolve chemical reactions while they occur on various surface morphologies. The presented technique offers a unique scheme for real-time, label-free, and high-resolution probing of local reaction kinetics in a plethora of chemical reactions on surfaces.