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Ag@SiO2 Core-Shell Nanoparticles for Probing Spatial Distribution of Electromagnetic Field Enhancement via Surface-Enhanced Raman Scattering

Wang, Wei; Li, Zhipeng; Gu, Baohua; Zhang, Zhenyu and Xu, Hongxing LU (2009) In ACS Nano 3(11). p.3493-3496
Abstract
We show that the spatial distribution of the electromagnetic (EM) field enhancement can be probed directly via dynamic evolution of surface-enhanced Raman scattering (SERS) of rhodamine 6G (R6G) molecules as they diffuse into Ag@SiO2 core-shell nanoparticles. The porous silica shell limits the diffusion of R6G molecules toward Inner Ag cores, thereby allowing direct observation and quantification of the spatial distribution of SERS enhancement as molecules migrate from the low to high EM fields inside the dielectric silica shell. Our experimental evidence is validated by the generalized Mie theory, and the approach can potentially offer a novel platform for further investigating the site and spatial distribution of the EM fields and the EM... (More)
We show that the spatial distribution of the electromagnetic (EM) field enhancement can be probed directly via dynamic evolution of surface-enhanced Raman scattering (SERS) of rhodamine 6G (R6G) molecules as they diffuse into Ag@SiO2 core-shell nanoparticles. The porous silica shell limits the diffusion of R6G molecules toward Inner Ag cores, thereby allowing direct observation and quantification of the spatial distribution of SERS enhancement as molecules migrate from the low to high EM fields inside the dielectric silica shell. Our experimental evidence is validated by the generalized Mie theory, and the approach can potentially offer a novel platform for further investigating the site and spatial distribution of the EM fields and the EM versus chemical enhancement of SERS due to molecular confinement within the Ag@SiO2 nanoshell. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
electromagnetic field enhancement, spatial distribution, silica, silver, Raman scattering, nanoparticles
in
ACS Nano
volume
3
issue
11
pages
3493 - 3496
publisher
The American Chemical Society
external identifiers
  • wos:000271951200022
  • scopus:73249147097
ISSN
1936-086X
DOI
10.1021/nn9009533
language
English
LU publication?
yes
id
60ce4eff-789a-4532-bcde-5136b2446dfb (old id 1518599)
date added to LUP
2009-12-28 15:19:54
date last changed
2017-12-10 03:45:06
@article{60ce4eff-789a-4532-bcde-5136b2446dfb,
  abstract     = {We show that the spatial distribution of the electromagnetic (EM) field enhancement can be probed directly via dynamic evolution of surface-enhanced Raman scattering (SERS) of rhodamine 6G (R6G) molecules as they diffuse into Ag@SiO2 core-shell nanoparticles. The porous silica shell limits the diffusion of R6G molecules toward Inner Ag cores, thereby allowing direct observation and quantification of the spatial distribution of SERS enhancement as molecules migrate from the low to high EM fields inside the dielectric silica shell. Our experimental evidence is validated by the generalized Mie theory, and the approach can potentially offer a novel platform for further investigating the site and spatial distribution of the EM fields and the EM versus chemical enhancement of SERS due to molecular confinement within the Ag@SiO2 nanoshell.},
  author       = {Wang, Wei and Li, Zhipeng and Gu, Baohua and Zhang, Zhenyu and Xu, Hongxing},
  issn         = {1936-086X},
  keyword      = {electromagnetic field enhancement,spatial distribution,silica,silver,Raman scattering,nanoparticles},
  language     = {eng},
  number       = {11},
  pages        = {3493--3496},
  publisher    = {The American Chemical Society},
  series       = {ACS Nano},
  title        = {Ag@SiO2 Core-Shell Nanoparticles for Probing Spatial Distribution of Electromagnetic Field Enhancement via Surface-Enhanced Raman Scattering},
  url          = {http://dx.doi.org/10.1021/nn9009533},
  volume       = {3},
  year         = {2009},
}