Alloying Bulk-Immiscible Metals at the Nanoscale: An XPS/STM Study of Bimetallic Ag-Pt/HOPG Nanoparticles Full article
| Journal |
Applied Surface Science
ISSN: 0169-4332 |
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| Output data | Year: 2023, Volume: 636, Article number : 157872, Pages count : 13 DOI: 10.1016/j.apsusc.2023.157872 | ||
| Tags | Bimetallic nanoparticles; Ag-Pt nanoparticles; Alloy design; Heterogeneous supported catalysts; Scanning tunneling microscopy; X-ray photoelectron spectroscopy | ||
| Authors |
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| Affiliations |
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Funding (1)
| 1 | Ministry of Science and Higher Education of the Russian Federation | 0239-2021-0002 |
Abstract:
The intentional tailoring of surface structure in bimetallic nanoparticles is of high interest for academic research and industry, and many attempts have been made to improve the control over the distribution mode of the constituent elements which ranges from homogeneously mixed nanoalloys to core–shell nanostructures. However, some metal combinations exhibit a wide miscibility gap in the bulk, which nonetheless could be overcome under definite conditions at the nanoscale due to size effects. Here we present the detailed XPS/STM investigation of alloying capability of bulk-immiscible metals on the example of the Ag-Pt/HOPG bimetallic system prepared by thermal vacuum deposition. We found out that partial alloying of Ag and Pt occurs already at the preparation stage, and the following thermal annealing of the Ag-Pt/HOPG samples at 300–400 ◦C does not help to enhance the alloying degree owing to thermodynamically driven surface segregation of silver. Increasing the annealing temperature ruins the structure of Ag-Pt bimetallic nanoparticles due to silver sublimation, while even
longer annealing time leads to partial phase separation. Our results demonstrate a limited alloying capability of Pt and Ag at the nanoscale which will be relevant for further research on the design and functioning of bimetallic catalysts containing bulk-immiscible metals.
Cite:
Fedorov A.Y.
, Bukhtiyarov A.V.
, Panafidin M.A.
, Prosvirin I.P.
, Zubavichus Y.V.
, Bukhtiyarov V.I.
Alloying Bulk-Immiscible Metals at the Nanoscale: An XPS/STM Study of Bimetallic Ag-Pt/HOPG Nanoparticles
Applied Surface Science. 2023. V.636. 157872 :1-13. DOI: 10.1016/j.apsusc.2023.157872 WOS Scopus РИНЦ AN OpenAlex
Alloying Bulk-Immiscible Metals at the Nanoscale: An XPS/STM Study of Bimetallic Ag-Pt/HOPG Nanoparticles
Applied Surface Science. 2023. V.636. 157872 :1-13. DOI: 10.1016/j.apsusc.2023.157872 WOS Scopus РИНЦ AN OpenAlex
Dates:
| Submitted: | Apr 19, 2023 |
| Accepted: | Jun 23, 2023 |
| Published online: | Jun 25, 2023 |
| Published print: | Nov 1, 2023 |
Identifiers:
| Web of science: | WOS:001027023000001 |
| Scopus: | 2-s2.0-85165395527 |
| Elibrary: | 54381989 |
| Chemical Abstracts: | 2023:1344888 |
| OpenAlex: | W4381949849 |