Real‐Space Observation of Atomic Site‐Specific Electronic Properties of a Pt Nanoisland/Au(111) Bimetallic Surface by Tip‐Enhanced Raman Spectroscopy |
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| Authors: | Hai‐Sheng Su Xia‐Guang Zhang Juan‐Juan Sun Xi Jin Prof?Dr De‐Yin Wu Dr Xiao‐Bing Lian Dr Jin‐Hui Zhong Prof?Dr Bin Ren |
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| Institution: | 1. Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), State Key Laboratory of Physical Chemistry of Solid Surfaces, The MOE Key Laboratory of Spectrochemical Analysis and Instrumentation, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, China;2. Department of Materials Chemistry, School of Chemical and Materials Engineering, Quanzhou Normal University, Quanzhou, China;3. Present address: Institute of Physics, Carl von Ossietzky University Oldenburg, Oldenburg, Germany |
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| Abstract: | Resolving atomic site‐specific electronic properties and correlated substrate–molecule interactions is challenging in real space. Now, mapping of sub‐10 nm sized Pt nanoislands on a Au(111) surface was achieved by tip‐enhanced Raman spectroscopy, using the distinct Raman fingerprints of adsorbed 4‐chlorophenyl isocyanide molecules. A spatial resolution better than 2.5 nm allows the electronic properties of the terrace, step edge, kink, and corner sites with varying coordination environments to be resolved in real space in one Pt nanoisland. Calculations suggest that low‐coordinate atomic sites have a higher d‐band electronic profile and thus stronger metal–molecule interactions, leading to the observed blue‐shift of Raman frequency of the N≡C bond of adsorbed molecules. An experimental and theoretical study on Pt(111) and mono‐ and bi‐atomic layer Pt nanoislands on a Au(111) surface reveals the bimetallic effect that weakens with the increasing number of deposited Pt adlayer. |
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| Keywords: | bimetallic surface platinum site-specific electronic properties surface chemistry tip-enhanced Raman spectroscopy |
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