Tuning the coalescence degree in the growth of Pt-Pd nanoalloys.
Journal
Nanoscale advances
ISSN: 2516-0230
Titre abrégé: Nanoscale Adv
Pays: England
ID NLM: 101738708
Informations de publication
Date de publication:
10 Feb 2021
10 Feb 2021
Historique:
received:
24
10
2020
accepted:
03
12
2020
entrez:
22
9
2022
pubmed:
9
12
2020
medline:
9
12
2020
Statut:
epublish
Résumé
Coalescence is a phenomenon in which two or more nanoparticles merge to form a single larger aggregate. By means of gas-phase magnetron-sputtering aggregation experiments on Pt-Pd nanoalloys, it is shown that the degree of coalescence can be tuned from a growth regime in which coalescence is negligible to a regime where the growth outcome is dominated by coalescence events. This transition is achieved by varying both the length of the aggregation zone and the pressure difference between the aggregation and the deposition chamber. In the coalescence-dominated regime, a wide variety of coalescing aggregates is produced and analyzed by TEM. The experimental results are interpreted with the aid of molecular-dynamics simulations. This allows to distinguish four different steps through which coalescence proceeds towards equilibrium. These steps, occurring on a hierarchy of well-separated time scales, consist in: (i) alignment of atomic columns; (ii) alignment of close-packed atomic planes; (iii) equilibration of shape; (iv) equilibration of chemical ordering.
Identifiants
pubmed: 36133833
doi: 10.1039/d0na00891e
pii: d0na00891e
pmc: PMC9416879
doi:
Types de publication
Journal Article
Langues
eng
Pagination
836-846Informations de copyright
This journal is © The Royal Society of Chemistry.
Déclaration de conflit d'intérêts
The authors declare no conflict of interest.
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