Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 10: New Methods and Developments II: Scanning Probe, Spectroscopic, and Diffraction Techniques
O 10.12: Vortrag
Montag, 1. April 2019, 17:45–18:00, H3
Probing atomic site-specific electronic and catalytic properties of bimetallic surfaces by tip-enhanced Raman spectroscopy — •Jinhui Zhong1,2, Hai-Sheng Su1, Xi Jin1, Xia-Guang Zhang1, De-Yin Wu1, and Bin Ren1 — 1State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen 361005, China — 2Institute of Physics, Carl von Ossietzky University Oldenburg, 26129 Oldenburg, Germany
Revealing site-specific electronic and catalytic properties of catalysts is highly desirable for an atomic and molecular level understanding of heterogeneous catalysis. We demonstrated the use of tip-enhanced Raman spectroscopy (TERS) to chemically and spatially resolve site-specific electronic and catalytic properties of bimetallic catalyst surfaces [1,2]. We first investigated an atomically well-defined Pd(sub-monolayer)/Au(111) bimetallic model catalyst surface using phenyl isocyanide as a probe molecule. We obtained local nanospectroscopy at a spatial resolution of 3 nm in real space, which revealed a weakened NC bond and enhanced reactivity of phenyl isocyanide adsorbed at the Pd step edge compared with that at the Pd terrace site. We further studied a sub-10 nm sized Pt nanoisland deposited on Au(111) surface. Site-specific properties of Au terrace, Pt terrace, step edge, corner and kink sites with varying coordination numbers on the Pt nanoisland/Au(111) bimetallic surface were observed. Our results pushes important steps towards the (in-situ) probing and understanding of local structure correlated catalytic activity and selectivity of real catalysts at truly atomic and molecular level.