Chemical Orderings in CuCo Nanoparticles: Topological Modeling Using DFT Calculations.
Saved in:
| Title: | Chemical Orderings in CuCo Nanoparticles: Topological Modeling Using DFT Calculations. |
|---|---|
| Authors: | Neyman, Konstantin M.1,2 (AUTHOR) konstantin.neyman@icrea.cat, Alemany, Pere2 (AUTHOR) |
| Source: | Nanomaterials (2079-4991). Aug2024, Vol. 14 Issue 15, p1242. 11p. |
| Subjects: | Magnetic materials, Adsorption (Chemistry), Copper, Magnetic nanoparticles, Surface segregation |
| Abstract: | The orderings of atoms in bimetallic 1.6–2.1 nm-large CuCo nanoparticles, important as catalytic and magnetic materials, were studied using a combination of DFT calculations with a topological approach. The structure and magnetism of Cu50Co151, Cu101Co100, Cu151Co50, and Cu303Co102 nanoparticles; their resistance to disintegrating into separate Cu and Co species; as well as the exposed surface sites, were quantified and analyzed, showing a clear preference for Cu atoms to occupy surface positions while the Co atoms tended to form a compact cluster in the interior of the nanoparticles. The surface segregation of Co atoms that are encapsulated by less-active Cu atoms, induced by the adsorption of CO molecules, was already enabled at a low coverage of adsorbed CO, providing the energy required to displace the entire compact Co species inside the Cu matrices due to a notable adsorption preference of CO for the Co sites over the Cu ones. The calculated adsorption energies and vibrational frequencies of adsorbed CO should be helpful indicators for experimentally monitoring the nature of the surface sites of CuCo nanoparticles, especially in the case of active Co surface sites emerging in the presence of CO. [ABSTRACT FROM AUTHOR] |
| Copyright of Nanomaterials (2079-4991) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
|
Full text is not displayed to guests.
Login for full access.
|
|
| FullText | Links: – Type: pdflink Text: Availability: 1 |
|---|---|
| Header | DbId: egs DbLabel: Engineering Source An: 178952034 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
| IllustrationInfo | |
| Items | – Name: Title Label: Title Group: Ti Data: Chemical Orderings in CuCo Nanoparticles: Topological Modeling Using DFT Calculations. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Neyman%2C+Konstantin+M%2E%22">Neyman, Konstantin M.</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> konstantin.neyman@icrea.cat</i><br /><searchLink fieldCode="AR" term="%22Alemany%2C+Pere%22">Alemany, Pere</searchLink><relatesTo>2</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Nanomaterials+%282079-4991%29%22">Nanomaterials (2079-4991)</searchLink>. Aug2024, Vol. 14 Issue 15, p1242. 11p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Magnetic+materials%22">Magnetic materials</searchLink><br /><searchLink fieldCode="DE" term="%22Adsorption+%28Chemistry%29%22">Adsorption (Chemistry)</searchLink><br /><searchLink fieldCode="DE" term="%22Copper%22">Copper</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+nanoparticles%22">Magnetic nanoparticles</searchLink><br /><searchLink fieldCode="DE" term="%22Surface+segregation%22">Surface segregation</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The orderings of atoms in bimetallic 1.6–2.1 nm-large CuCo nanoparticles, important as catalytic and magnetic materials, were studied using a combination of DFT calculations with a topological approach. The structure and magnetism of Cu50Co151, Cu101Co100, Cu151Co50, and Cu303Co102 nanoparticles; their resistance to disintegrating into separate Cu and Co species; as well as the exposed surface sites, were quantified and analyzed, showing a clear preference for Cu atoms to occupy surface positions while the Co atoms tended to form a compact cluster in the interior of the nanoparticles. The surface segregation of Co atoms that are encapsulated by less-active Cu atoms, induced by the adsorption of CO molecules, was already enabled at a low coverage of adsorbed CO, providing the energy required to displace the entire compact Co species inside the Cu matrices due to a notable adsorption preference of CO for the Co sites over the Cu ones. The calculated adsorption energies and vibrational frequencies of adsorbed CO should be helpful indicators for experimentally monitoring the nature of the surface sites of CuCo nanoparticles, especially in the case of active Co surface sites emerging in the presence of CO. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Nanomaterials (2079-4991) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
| PLink | https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=178952034 |
| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.3390/nano14151242 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 11 StartPage: 1242 Subjects: – SubjectFull: Magnetic materials Type: general – SubjectFull: Adsorption (Chemistry) Type: general – SubjectFull: Copper Type: general – SubjectFull: Magnetic nanoparticles Type: general – SubjectFull: Surface segregation Type: general Titles: – TitleFull: Chemical Orderings in CuCo Nanoparticles: Topological Modeling Using DFT Calculations. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Neyman, Konstantin M. – PersonEntity: Name: NameFull: Alemany, Pere IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 08 Text: Aug2024 Type: published Y: 2024 Identifiers: – Type: issn-print Value: 20794991 Numbering: – Type: volume Value: 14 – Type: issue Value: 15 Titles: – TitleFull: Nanomaterials (2079-4991) Type: main |
| ResultId | 1 |
