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Real‐Space Observation of Atomic Site‐Specific Electronic Properties of a Pt Nanoisland/Au(111) Bimetallic Surface by Tip‐Enhanced Raman Spectroscopy
Author(s) -
Su HaiSheng,
Zhang XiaGuang,
Sun JuanJuan,
Jin Xi,
Wu DeYin,
Lian XiaoBing,
Zhong JinHui,
Ren Bin
Publication year - 2018
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201807778
Subject(s) - raman spectroscopy , bimetallic strip , molecule , substrate (aquarium) , materials science , electronic structure , surface enhanced raman spectroscopy , chemical physics , spectroscopy , adsorption , chemistry , metal , raman scattering , computational chemistry , physics , oceanography , organic chemistry , quantum mechanics , optics , metallurgy , geology
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.