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Phase-Controlled Synthesis of Ru Nanocrystals via Template-Directed Growth: Surface Energy versus Bulk Energy.

Authors
  • Janssen, Annemieke1
  • Lyu, Zhiheng1
  • Figueras-Valls, Marc2
  • Chao, Hsin-Yun3
  • Shi, Yifeng4
  • Pawlik, Veronica1
  • Chi, Miaofang3
  • Mavrikakis, Manos2
  • Xia, Younan1, 5
  • 1 School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, United States. , (Georgia)
  • 2 Department of Chemical and Biological Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States. , (United States)
  • 3 Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States. , (United States)
  • 4 School of Chemical and Biochemical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States. , (Georgia)
  • 5 The Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, Georgia 30332, United States. , (Georgia)
Type
Published Article
Journal
Nano Letters
Publisher
American Chemical Society
Publication Date
Apr 19, 2022
Identifiers
DOI: 10.1021/acs.nanolett.1c05009
PMID: 35439017
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Despite the successful control of crystal phase using template-directed growth, much remains unknown about the underlying mechanisms. Here, we demonstrate that the crystal phase taken by the deposited metal depends on the lateral size of face-centered cubic (fcc)-Pd nanoplate templates with 12 nm plates giving fcc-Ru while 18-26 nm plates result in hexagonal closed-packed (hcp)-Ru. Although Ru overlayers with a metastable fcc- (high in bulk energy) or stable hcp-phase (low in bulk energy) can be epitaxially deposited on the basal planes, the lattice mismatch will lead to jagged hcp- (high in surface energy) and smooth fcc-facets (low in surface energy), respectively, on the side faces. As the proportion of basal and side faces on the nanoplates varies with lateral size, the crystal phase will change depending on the relative contributions from the surface and bulk energies. The [email protected] outperforms the [email protected] nanoplates toward ethylene glycol and glycerol oxidation reactions.

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