Real‐Space Observation of Atomic Site‐Specific Electronic Properties of a Pt Nanoisland/Au(111) Bimetallic Surface by Tip‐Enhanced Raman Spectroscopy
| Autor: | Bin Ren, Xiao-Bing Lian, Hai-Sheng Su, Xia-Guang Zhang, Xi Jin, De-Yin Wu, Jin-Hui Zhong, Juan-Juan Sun |
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| Rok vydání: | 2018 |
| Předmět: |
Surface (mathematics)
Materials science Isocyanide chemistry.chemical_element 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Catalysis 0104 chemical sciences symbols.namesake chemistry.chemical_compound Adsorption chemistry Chemical physics symbols Molecule 0210 nano-technology Raman spectroscopy Platinum Layer (electronics) Bimetallic strip |
| Zdroj: | Angewandte Chemie International Edition. 57:13177-13181 |
| ISSN: | 1521-3773 1433-7851 |
| DOI: | 10.1002/anie.201807778 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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