General Trends in Core-Shell Preferences for Bimetallic Nanoparticles
Eom, Namsoon LU ; Messing, Maria E. LU ; Johansson, Jonas LU
and Deppert, Knut
LU
(2021)
In ACS Nano
15(5).
p.8883-8895
- Abstract
Surface segregation phenomena dictate core-shell preference of bimetallic nanoparticles and thus play a crucial role in the nanoparticle synthesis and applications. Although it is generally agreed that surface segregation depends on the constituent materials' physical properties, a comprehensive picture of the phenomena on the nanoscale is not yet complete. Here we use a combination of molecular dynamics (MD) and Monte Carlo (MC) simulations on 45 bimetallic combinations to determine the general trend on the core-shell preference and the effects of size and composition. From the extensive studies over sizes and compositions, we find that the surface segregation and degree of the core-shell tendency of the bimetallic combinations depend... (More)
Surface segregation phenomena dictate core-shell preference of bimetallic nanoparticles and thus play a crucial role in the nanoparticle synthesis and applications. Although it is generally agreed that surface segregation depends on the constituent materials' physical properties, a comprehensive picture of the phenomena on the nanoscale is not yet complete. Here we use a combination of molecular dynamics (MD) and Monte Carlo (MC) simulations on 45 bimetallic combinations to determine the general trend on the core-shell preference and the effects of size and composition. From the extensive studies over sizes and compositions, we find that the surface segregation and degree of the core-shell tendency of the bimetallic combinations depend on the sufficiency or scarcity of the surface-preferring material. Principal component analysis (PCA) and linear discriminant analysis (LDA) on the molecular dynamics simulations results reveal that cohesive energy and Wigner-Seitz radius are the two primary factors that have an "additive"effect on the segregation level and core-shell preference in the bimetallic nanoparticles studied. When the element with the higher cohesive energy also has the larger Wigner-Seitz radius, its core preference decreases, and thus this combination forms less segregated structures than what one would expect from the cohesive energy difference alone. Highly segregated structures (highly segregated core-shell or Janus-like) are expected to form when both the relative cohesive energy difference is greater than ∼20%, and the relative Wigner-Seitz radius difference is greater than ∼4%. Practical guides for predicting core-shell preference and degree of segregation level are presented.
(Less)
- author
- Eom, Namsoon
LU
; Messing, Maria E.
LU
; Johansson, Jonas
LU
and Deppert, Knut
LU
- organization
- publishing date
- 2021-05-25
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- bimetallic nanoparticles, core-shell nanoparticles, linear discriminant analysis, molecular dynamics, principal component analysis, surface segregation
- in
- ACS Nano
- volume
- 15
- issue
- 5
- pages
- 13 pages
- publisher
- The American Chemical Society (ACS)
- external identifiers
-
- scopus:85106450198
- pmid:33890464
- ISSN
- 1936-0851
- DOI
- 10.1021/acsnano.1c01500
- language
- English
- LU publication?
- yes
- id
- c4f59165-7e18-41c1-86c8-083b8ce4fc9d
- date added to LUP
- 2021-06-17 16:28:17
- date last changed
- 2024-04-20 08:41:31
@article{c4f59165-7e18-41c1-86c8-083b8ce4fc9d,
abstract = {{<p>Surface segregation phenomena dictate core-shell preference of bimetallic nanoparticles and thus play a crucial role in the nanoparticle synthesis and applications. Although it is generally agreed that surface segregation depends on the constituent materials' physical properties, a comprehensive picture of the phenomena on the nanoscale is not yet complete. Here we use a combination of molecular dynamics (MD) and Monte Carlo (MC) simulations on 45 bimetallic combinations to determine the general trend on the core-shell preference and the effects of size and composition. From the extensive studies over sizes and compositions, we find that the surface segregation and degree of the core-shell tendency of the bimetallic combinations depend on the sufficiency or scarcity of the surface-preferring material. Principal component analysis (PCA) and linear discriminant analysis (LDA) on the molecular dynamics simulations results reveal that cohesive energy and Wigner-Seitz radius are the two primary factors that have an "additive"effect on the segregation level and core-shell preference in the bimetallic nanoparticles studied. When the element with the higher cohesive energy also has the larger Wigner-Seitz radius, its core preference decreases, and thus this combination forms less segregated structures than what one would expect from the cohesive energy difference alone. Highly segregated structures (highly segregated core-shell or Janus-like) are expected to form when both the relative cohesive energy difference is greater than ∼20%, and the relative Wigner-Seitz radius difference is greater than ∼4%. Practical guides for predicting core-shell preference and degree of segregation level are presented. </p>}},
author = {{Eom, Namsoon and Messing, Maria E. and Johansson, Jonas and Deppert, Knut}},
issn = {{1936-0851}},
keywords = {{bimetallic nanoparticles; core-shell nanoparticles; linear discriminant analysis; molecular dynamics; principal component analysis; surface segregation}},
language = {{eng}},
month = {{05}},
number = {{5}},
pages = {{8883--8895}},
publisher = {{The American Chemical Society (ACS)}},
series = {{ACS Nano}},
title = {{General Trends in Core-Shell Preferences for Bimetallic Nanoparticles}},
url = {{http://dx.doi.org/10.1021/acsnano.1c01500}},
doi = {{10.1021/acsnano.1c01500}},
volume = {{15}},
year = {{2021}},
}