Composition-dependent chemical ordering predicted in Pt–Ag nanoalloys - Aix-Marseille Université Accéder directement au contenu
Article Dans Une Revue Physical Chemistry Chemical Physics Année : 2023

Composition-dependent chemical ordering predicted in Pt–Ag nanoalloys

Alexis Front
  • Fonction : Auteur

Résumé

Pt-Ag nanoalloys display an astonishing chemical organization depending on their size and composition. Reversed size-dependent stabilization of ordered nanophases [J. Pirart et al., Nat. Commun., 2019, 10, 1982-1989] has recently been shown around equiconcentration. We extend this study by a theoretical investigation on the whole range of compositions showing a significant composition-dependent chemical ordering in Pt-Ag nanoalloys. At a low silver content, the surface exhibits a strong Ag segregation coupled to a (2 Â 1) superstructure on the (100) facets. By increasing the silver concentration, the system displays an L1 1 ordered phase in the core, interrupted in a narrow range of concentrations by a concentric multishell structure characterized by an alternation of Ag-pure/Pt-pure concentric layers starting from the surface shell to the core. Although the L1 1 ordered phase has been observed experimentally, the concentric multishell structure is lacking due to the difficulty of the experimental characterization.
Fichier principal
Vignette du fichier
PtAg_nano.pdf (932.61 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-04285126 , version 1 (20-11-2023)

Identifiants

Citer

Alexis Front, Christine Mottet. Composition-dependent chemical ordering predicted in Pt–Ag nanoalloys. Physical Chemistry Chemical Physics, 2023, 25 (12), pp.8386 - 8391. ⟨10.1039/d2cp05829d⟩. ⟨hal-04285126⟩
6 Consultations
9 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More