Thermally Induced Surface Structure and Morphology Evolution in Bimetallic Pt-Au/HOPG Nanoparticles as Probed Using XPS and STM Full article
| Journal |
Nanomaterials
, E-ISSN: 2079-4991 |
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| Output data | Year: 2024, Volume: 14, Number: 1, Article number : 57, Pages count : 20 DOI: 10.3390/nano14010057 | ||
| Tags | bimetallic nanoparticles; Pt-Au nanoparticles; model catalysts; thermal annealing; STM; XPS; theoretical modeling | ||
| Authors |
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| Affiliations |
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Funding (1)
| 1 | Ministry of Science and Higher Education of the Russian Federation | 075-15-2022-263 |
Abstract:
Bimetallic nanoparticles expand the possibilities of catalyst design, providing an extra degree of freedom for tailoring the catalyst structure in comparison to purely monometallic systems. The distribution mode of two metal species defines the structure of surface catalytic sites, and current research efforts are focused on the development of methods for their controlled tuning. In light of this, a comprehensive investigation of the factors which influence the changes in the morphology of bimetallic nanoparticles, including the elemental redistribution, are mandatory for each particular bimetallic system. Here we present the combined XPS/STM study of the surface structure and morphology of bimetallic Pt-Au/HOPG nanoparticles prepared by thermal vacuum deposition and show that thermal annealing up to 350 ◦C induces the alloying process between the two bulk-immiscible metal components. Increasing the treatment temperature enhances the extent of
Pt-Au alloying. However, the sintering of nanoparticles starts to occur above 500 ◦C. The approach implemented in this work includes the theoretical simulation of XPS signal intensities for a more meticulous analysis of the compositional distribution and can be helpful from a methodological perspective for other XPS/STM studies of bimetallic nanoparticles on planar supports.
Cite:
Fedorov A.Y.
, Bukhtiyarov A.V.
, Panafidin M.A.
, Prosvirin I.P.
, Zubavichus Y.V.
, Bukhtiyarov V.I.
Thermally Induced Surface Structure and Morphology Evolution in Bimetallic Pt-Au/HOPG Nanoparticles as Probed Using XPS and STM
Nanomaterials. 2024. V.14. N1. 57 :1-20. DOI: 10.3390/nano14010057 WOS Scopus РИНЦ AN PMID OpenAlex
Thermally Induced Surface Structure and Morphology Evolution in Bimetallic Pt-Au/HOPG Nanoparticles as Probed Using XPS and STM
Nanomaterials. 2024. V.14. N1. 57 :1-20. DOI: 10.3390/nano14010057 WOS Scopus РИНЦ AN PMID OpenAlex
Dates:
| Submitted: | Nov 9, 2023 |
| Accepted: | Dec 21, 2023 |
| Published online: | Dec 25, 2023 |
| Published print: | Jan 1, 2024 |
Identifiers:
| Web of science: | WOS:001140708000001 |
| Scopus: | 2-s2.0-85181913742 |
| Elibrary: | 64798861 |
| Chemical Abstracts: | 2024:137442 |
| PMID: | 38202512 |
| OpenAlex: | W4390196520 |