期刊
NANO LETTERS
卷 11, 期 8, 页码 3394-3398出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl201796s
关键词
Anisotropic nanostructures; gold; underpotential deposition; silver; seed-mediated synthesis
类别
资金
- DoD
- AFOSR
- National Science Foundation at the Materials Research Center of Northwestern University [DMR-0520513]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0000989]
- NSF-NSEC
- NSF-MRSEC
- Keck Foundation
- State of Illinois
- Northwestern University
- DoD through the National Defense Science & Engineering Graduate (NDSEG) [32 CFR 168a]
Four different gold nanostructures: octahedra, rhombic dodecahedra, truncated ditetragonal prisms, and concave cubes, have been synthesized using a seed-mediated growth method by strategically varying the Ag+ concentration in the reaction solution. Using X-ray photoelectron spectroscopy and inductively coupled plasma atomic emission spectroscopy, we provide quantitative evidence that Ag underpotential deposition is responsible for stabilizing the various surface facets that enclose the above nanoparticles. Increasing concentrations of Ag+ in the growth solution stabilize more open surface facets, and experimental values for Ag coverage on the surface of the particles fit well with a calculated monolayer coverage of Ag, as expected via underpotential deposition.
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