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Title: Seed-Mediated Growth of Gold Nanocrystals: Changes to the Crystallinity or Morphology as Induced by the Treatment of Seeds with a Sulfur Species

We report our observation of changes to the crystallinity or morphology during seed-mediated growth of Au nanocrystals. When single-crystal Au seeds with a spherical or rod-like shape were treated with a chemical species such as S₂O₃²⁻ ions, twin defects were developed during the growth process to generate multiply twinned nanostructures. X-ray photoelectron spectroscopy analysis indicated that the S₂O₃²⁻ ions were chemisorbed on the surfaces of the seeds during the treatment. The chemisorbed S₂O₃²⁻ ions somehow influenced the crystallization of Au atoms added onto the surface during a growth process, leading to the formation of twin defects. In contrast to the spherical and rod-like Au seeds, the single-crystal structure was retained to generate a concave morphology when single-crystal Au seeds with a cubic or octahedral shape were used for a similar treatment and then seed-mediated growth. The different outcomes are likely related to the difference in spatial distribution of S₂O₃²⁻ ions chemisorbed on the surface of a seed. This approach based on surface modification is potentially extendable to other noble metals for engineering the crystallinity and morphology of nanocrystals formed via seed-mediated growth.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [3] ;  [6]
  1. Georgia Inst. of Technology, Atlanta, GA (United States). School of Chemistry and Biochemistry
  2. Georgia Inst. of Technology, Atlanta, GA (United States) Wallace H. Coulter Dept. of Biomedical Engineering; Emory Univ., Atlanta, GA (United States); Wuhan Univ. (China). College of Chemistry and Molecular Sciences. State Key Lab. of Analytical Chemistry for Biology and Medicine
  3. Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.
  4. Georgia Inst. of Technology, Atlanta, GA (United States). School of Chemistry and Biochemistry
  5. Georgia Inst. of Technology, Atlanta, GA (United States) Wallace H. Coulter Dept. of Biomedical Engineering; Emory Univ., Atlanta, GA (United States)
  6. Georgia Inst. of Technology, Atlanta, GA (United States). School of Chemistry and Biochemistry and Wallace H. Coulter Dept. of Biomedical Engineering; Emory Univ., Atlanta, GA (United States)
Publication Date:
OSTI Identifier:
1201341
Report Number(s):
BNL--107873-2015-JA
Journal ID: ISSN 1520-6106; R&D Project: MA015MACA; KC0201010
Grant/Contract Number:
SC00112704
Type:
Accepted Manuscript
Journal Name:
Journal of Physical Chemistry. B, Condensed Matter, Materials, Surfaces, Interfaces and Biophysical Chemistry
Additional Journal Information:
Journal Volume: 118; Journal Issue: 49; Journal ID: ISSN 1520-6106
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:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY crystallinity; gold; thiosulfate ions; seed-mediated growth; twin defects