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Spectroelectrochemistry of Silver Deposition on Single Gold Nanocrystals.

Authors
  • Chirea, Mariana
  • Collins, Sean S E
  • Wei, Xingzhan
  • Mulvaney, Paul
Type
Published Article
Journal
The Journal of Physical Chemistry Letters
Publisher
American Chemical Society
Publication Date
Dec 18, 2014
Volume
5
Issue
24
Pages
4331–4335
Identifiers
DOI: 10.1021/jz502349x
PMID: 26273983
Source
Medline
Keywords
License
Unknown

Abstract

We report the electrodeposition of metallic silver onto gold nanostars adsorbed to ITO electrodes. The electrochemical process was studied at the single particle level by correlated in situ dark field spectroscopy and scanning electron microscopy (SEM). Underpotential deposition avoids bulk silver formation on the ITO substrates. SEM proves that deposition occurs on all surfaces of the gold nanostars when polyvinylpyrrolidone (PVP) is stabilizing the nanostars or preferentially at the nanostar tips when the ligand is removed. The surface plasmon resonance blue-shifts by more than 100 nm following the formation of a 5 nm Ag film on PVP stabilized gold nanostars, moving the scattered color from the near-infrared to red or orange. The spectral shifts can be accurately modeled using finite element simulations. These results demonstrate that the morphology and composition of individual bimetallic nanocrystals can be engineered electrochemically.

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