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Silver Nanorice Structures: Oriented Attachment-Dominated Growth, High Environmental Sensitivity, and Real-Space Visualization of Multipolar Resonances

Liang, Hongyan; Zhao, Haiguang; Rossouw, David; Wang, Wenzhong; Xu, Hongxing LU ; Botton, Gianluigi A. and Ma, Dongling (2012) In Chemistry of Materials 24(12). p.2339-2346
Abstract
We have synthesized and investigated the anisotropic growth of interesting silver nanorice. Its growth is kinetically controlled at 100 degrees C, and both oriented attachment and Ostwald ripening are involved, with the former growth mode dominating the anisotropic growth of the nanorice along the < 111 > direction. This one-directional growth is initiated by an indispensable seed-selection process, in which oxygen plays a critical role in oxidatively etching twinned silver crystals. The inhibition of this process by removing oxygen essentially blocks the nanorice growth. Although increasing reaction temperature to 120 degrees C accelerates the one-dimensional growth along the < 111 > direction, further temperature increase to... (More)
We have synthesized and investigated the anisotropic growth of interesting silver nanorice. Its growth is kinetically controlled at 100 degrees C, and both oriented attachment and Ostwald ripening are involved, with the former growth mode dominating the anisotropic growth of the nanorice along the < 111 > direction. This one-directional growth is initiated by an indispensable seed-selection process, in which oxygen plays a critical role in oxidatively etching twinned silver crystals. The inhibition of this process by removing oxygen essentially blocks the nanorice growth. Although increasing reaction temperature to 120 degrees C accelerates the one-dimensional growth along the < 111 > direction, further temperature increase to 160 degrees C makes the oriented attachment dominated one-directional growth disappear; instead, the diffusion-controlled two-dimensional growth leads to the emergence of highly faceted truncated triangular and hexagonal plates mainly bound by low energy faces of {111}. Interestingly, we also found that the longitudinal surface plasmon resonance of the nanorice structures is highly sensitive to the refractive index of surrounding dielectric media, which predicts their promising applications as chemical or biological sensors. Moreover, the multipolar plasmonic resonances in these individual nanorice structures are visualized in real space, using high-resolution electron energy-loss spectroscopy. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
spectroscopy, resonance, silver nanorice, growth mechanism, multipolar plasmonic resonance, electron energy-loss, surface plasmon, oriented attachment
in
Chemistry of Materials
volume
24
issue
12
pages
2339 - 2346
publisher
The American Chemical Society
external identifiers
  • wos:000305662000014
ISSN
0897-4756
DOI
10.1021/cm3006875
language
English
LU publication?
yes
id
0ead0f10-1e6d-408f-8757-0c854a4d7f74 (old id 2866665)
date added to LUP
2012-07-24 15:33:25
date last changed
2016-04-15 14:14:02
@article{0ead0f10-1e6d-408f-8757-0c854a4d7f74,
  abstract     = {We have synthesized and investigated the anisotropic growth of interesting silver nanorice. Its growth is kinetically controlled at 100 degrees C, and both oriented attachment and Ostwald ripening are involved, with the former growth mode dominating the anisotropic growth of the nanorice along the &lt; 111 &gt; direction. This one-directional growth is initiated by an indispensable seed-selection process, in which oxygen plays a critical role in oxidatively etching twinned silver crystals. The inhibition of this process by removing oxygen essentially blocks the nanorice growth. Although increasing reaction temperature to 120 degrees C accelerates the one-dimensional growth along the &lt; 111 &gt; direction, further temperature increase to 160 degrees C makes the oriented attachment dominated one-directional growth disappear; instead, the diffusion-controlled two-dimensional growth leads to the emergence of highly faceted truncated triangular and hexagonal plates mainly bound by low energy faces of {111}. Interestingly, we also found that the longitudinal surface plasmon resonance of the nanorice structures is highly sensitive to the refractive index of surrounding dielectric media, which predicts their promising applications as chemical or biological sensors. Moreover, the multipolar plasmonic resonances in these individual nanorice structures are visualized in real space, using high-resolution electron energy-loss spectroscopy.},
  author       = {Liang, Hongyan and Zhao, Haiguang and Rossouw, David and Wang, Wenzhong and Xu, Hongxing and Botton, Gianluigi A. and Ma, Dongling},
  issn         = {0897-4756},
  keyword      = {spectroscopy,resonance,silver nanorice,growth mechanism,multipolar plasmonic resonance,electron energy-loss,surface plasmon,oriented attachment},
  language     = {eng},
  number       = {12},
  pages        = {2339--2346},
  publisher    = {The American Chemical Society},
  series       = {Chemistry of Materials},
  title        = {Silver Nanorice Structures: Oriented Attachment-Dominated Growth, High Environmental Sensitivity, and Real-Space Visualization of Multipolar Resonances},
  url          = {http://dx.doi.org/10.1021/cm3006875},
  volume       = {24},
  year         = {2012},
}