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The growth mechanism by stabilizing certain facets of Au in spines by underpotential deposition of Ag was investigated. The nanoparticles were analyzed primarily by STEM and EDS. Analysis of spines on nanoparticles synthesized with an Au/Ag ratio of 18/4 revealed that approximately 1 nm of Ag was deposited on the topmost surface of Au, and the growth direction of spines was <200>. Underpotential deposition of Ag nanolayers on specific facets of the spines on nanoparticles was observed for the first time by elemental mapping and HAADF STEM tomography.

Rights:

• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

  © 2024. Licensed under the Creative Commons https://creativecommons.org/licenses/by-nc-nd/4.0/.

Keyword: Star-shaped Au-Ag nanoparticles, Growth mechanism, underpotential deposition, plasmonic nanoparticles

Date published: 2024-03-01

Publisher: Elsevier BV

Journal:

• Materials Today Nano (ISSN: 25888420) vol. 25 100468

Funding:

• Japan Society for the Promotion of Science 23K11845
• Ministry of Education, Culture, Sports, Science and Technology A-21-NM-0080
• National Institute for Materials Science

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4684

First published URL: https://doi.org/10.1016/j.mtnano.2024.100468

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Updated at: 2026-03-01 12:30:08 +0900

Published on MDR: 2026-03-01 09:37:26 +0900