Shape Stability of Truncated Octahedral fcc Metal Nanocrystals

Lai, King C.; Chen, Minda; Yu, Jiaqi; Han, Yong; Huang, Wenyu; Evans, James W.

doi:10.1021/acsami.1c07894

Shape Stability of Truncated Octahedral fcc Metal Nanocrystals

Journal Article · Wed Jul 07 00:00:00 EDT 2021 · ACS Applied Materials and Interfaces

DOI:https://doi.org/10.1021/acsami.1c07894· OSTI ID:1817651

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Ames Lab., and Iowa State Univ., Ames, IA (United States)
Iowa State Univ., Ames, IA (United States)

Metallic nanocrystals (NCs) can be synthesized with tailored nonequilibrium shapes to enhance desired properties, e.g., octahedral fcc metal NCs optimize catalytic activity associated with {111} facets. However, maintenance of optimized properties requires stability against thermal reshaping. Thus, we analyze the reshaping of truncated fcc metal octahedra mediated by surface diffusion using a stochastic atomistic-level model with energetic input parameters for Pd. Furthermore, the model describes NC thermodynamics by an effective nearest-neighbor interaction and includes a realistic treatment of diffusive hopping for undercoordinated surface atoms. Kinetic Monte Carlo simulation reveals that the effective barrier, E_eff, for the initial stage of reshaping is strongly tied to the degree of truncation of the vertices in the synthesized initial octahedral shapes. This feature is elucidated via exact analytic determination of the energy variation along the optimal reshaping pathway at low-temperature (T), which involves transfer of atoms from truncated {100} vertex facets to form new layers on {111} side facets. Deviations from predictions of the low-T analysis due to entropic effects are more prominent for higher T and larger NC sizes.

View Accepted Manuscript (DOE)

Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division; National Science Foundation (NSF)

OSTI ID:: 1817651

Report Number(s):: IS--J 10,557

Journal Information:: ACS Applied Materials and Interfaces, Journal Name: ACS Applied Materials and Interfaces Journal Issue: 44 Vol. 13; ISSN 1944-8244

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
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