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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 16: Plasmonics and Nanooptics I: Local Probes and Raman (joint session O/CPP)
CPP 16.11: Vortrag
Montag, 16. März 2020, 13:00–13:15, WIL A317
Probing the Local Generation and Diffusion of Active Oxygen Species on a Pd/Au Bimetallic Surface by Tip-Enhanced Raman Spectroscopy — Hai-Sheng Su1, •Jin-Hui Zhong2,1, and Bin Ren1 — 1State Key Laboratory of Physical Chemistry of Solid Surfaces, iChEM, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China. — 2Institute of Physics, Carl von Ossietzky University, Oldenburg 26129, Germany
In this contribution, we discuss the application of tip-enhanced Raman spectroscopy (TERS) to image local atomic site-specific electronic and catalytic properties of bimetallic Pd monolayer/Au(111) [1] and Pt nanoisland/Au(111) surface [2]. The high spatial resolution (<3 nm) of TERS allows us to reveal distinct properties of surface atoms that correlate to the catalytic properties. We further probe the local generation and diffusion of OH radicals on a Pd monolayer/Au(111) bimetallic catalyst surface [3]. The reactive OH radicals can be catalytically generated from hydrogen peroxide (H2O2) at the active Pd step edge site and could diffuse to both the Au and Pd surface sites to induce oxidative reactions, with a diffusion length estimated to be about 5.4 nm. The results suggest the capability of TERS, as a plasmon-enhanced nanoscopy, to in-situ study catalysis with unprecedent spatial resolution and rich molecular identity. [1] J.-H. Zhong, B. Ren*, et al., Nat. Nanotech., 2017, 12, 132. [2] H.-S. Su, J.-H. Zhong*, B. Ren*, et al., Angew. Chem. Int. Ed. 2018, 57, 13177. [3] H.-S. Su, J.-H. Zhong*, B. Ren*, et al., submitted.