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Title: Controlling the Growth of Au on Icosahedral Seeds of Pd by Manipulating the Reduction Kinetics

This article reports a systematic study of how Au atoms nucleate and grow on Pd icosahedral seeds with a multiply twinned structure. By manipulating the reduction kinetics, we obtained Pd–Au bimetallic nanocrystals with two distinct shapes and structures. Specifically, Pd@Au core–shell icosahedra were formed when a relatively fast reduction rate was used for the HAuCl 4 precursor. At a slow reduction rate, in contrast, the nucleation and growth of Au atoms were mainly confined to one of the vertices of a Pd icosahedral seed, resulting in the formation of a Au icosahedron by sharing five adjacent faces with the Pd seed. The same growth pattern was observed for Pd icosahedral seeds with both sizes of 32 and 20 nm. Also, we have also investigated the effects of other kinetic parameters, including the concentration of reducing agent and reaction temperature, on the growth pathway undertaken by the Au atoms. In conclusion, we believe that the mechanistic insights obtained from this study can be extended to other systems, including the involvement of different metals and/or seeds with different morphologies.
Authors:
 [1] ;  [2] ;  [3] ;  [2] ;  [2] ;  [4] ;  [5] ;  [6]
  1. Georgia Institute of Technology and Emory University, Atlanta, GA (United States). The Wallace H. Coulter Department of Biomedical Engineering; East China Normal Univ. (ECNU), Shanghai (China). Engineering Research Center for Nanophotonics and Advanced Instrument, Ministry of Education, Department of Physics
  2. Georgia Institute of Technology and Emory University, Atlanta, GA (United States). The Wallace H. Coulter Department of Biomedical Engineering
  3. Georgia Inst. of Technology, Atlanta, GA (United States). School of Chemistry and Biochemistry and School of Chemical and Biomolecular Engineering
  4. Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Department
  5. East China Normal Univ. (ECNU), Shanghai (China). Engineering Research Center for Nanophotonics and Advanced Instrument, Ministry of Education, Department of Physics
  6. Georgia Institute of Technology and Emory University, Atlanta, GA (United States). The Wallace H. Coulter Department of Biomedical Engineering; Georgia Inst. of Technology, Atlanta, GA (United States). School of Chemistry and Biochemistry and School of Chemical and Biomolecular Engineering
Publication Date:
Report Number(s):
BNL-113598-2017-JA
Journal ID: ISSN 1932-7447; R&D Project: MA015MACA; KC0201010
Grant/Contract Number:
SC00112704; AC02-98CH10886
Type:
Accepted Manuscript
Journal Name:
Journal of Physical Chemistry. C
Additional Journal Information:
Journal Volume: 120; Journal Issue: 37; Journal ID: ISSN 1932-7447
Publisher:
American Chemical Society
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE
OSTI Identifier:
1347293