Details
| Original language | English |
|---|---|
| Pages (from-to) | 585-594 |
| Number of pages | 10 |
| Journal | Colloid and polymer science |
| Volume | 291 |
| Issue number | 3 |
| Publication status | Published - Mar 2013 |
| Externally published | Yes |
Abstract
We present the synthesis and analysis of silica-coated Au/Ag bimetallic nanorods with controlled surface plasmon bands. Depending on the thickness of Ag shell deposited on the Au nanorod surface, there is a blue-shift on the longitudinal surface plasmon band of Au nanorods, which can be expressed by an approximate formula derived from the absorption profile of light in Ag films using finite difference time domain simulations. The subsequent coating of silica shell not only enhances the stability of the Au/Ag bimetallic nanorods but also provides a mesoporous host for optically active species. Minute red-shifts of the longitudinal resonance mode, induced by stepwise increased silica shell volumes, are shown. Application as carrier for fluorescent rhodamine B molecules is demonstrated by photoluminescence analysis. On the single-particle level, dark field microscopy of Au/Ag-silica nanorods was finally employed. This introduces a route towards revealing the relation between structure, shape, and optical (plasmonic) properties of complex composite metal particles as well as fabrication strategies for nanoassemblies of tailored structures in the field of nanoplasmonics.
Keywords
- Core-shell nanorods, Nanoplasmonics, Optical properties
ASJC Scopus subject areas
- Chemistry(all)
- Physical and Theoretical Chemistry
- Materials Science(all)
- Polymers and Plastics
- Chemical Engineering(all)
- Colloid and Surface Chemistry
- Materials Science(all)
- Materials Chemistry
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In: Colloid and polymer science, Vol. 291, No. 3, 03.2013, p. 585-594.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Silica-coated Au/Ag nanorods with tunable surface plasmon bands for nanoplasmonics with single particles
AU - Wu, Shuang
AU - Schell, Andreas W.
AU - Lublow, Michael
AU - Kaiser, Julian
AU - Aichele, Thomas
AU - Schietinger, Stefan
AU - Polzer, Frank
AU - Kühn, Sergei
AU - Guo, Xuhong
AU - Benson, Oliver
AU - Ballauff, Matthias
AU - Lu, Yan
PY - 2013/3
Y1 - 2013/3
N2 - We present the synthesis and analysis of silica-coated Au/Ag bimetallic nanorods with controlled surface plasmon bands. Depending on the thickness of Ag shell deposited on the Au nanorod surface, there is a blue-shift on the longitudinal surface plasmon band of Au nanorods, which can be expressed by an approximate formula derived from the absorption profile of light in Ag films using finite difference time domain simulations. The subsequent coating of silica shell not only enhances the stability of the Au/Ag bimetallic nanorods but also provides a mesoporous host for optically active species. Minute red-shifts of the longitudinal resonance mode, induced by stepwise increased silica shell volumes, are shown. Application as carrier for fluorescent rhodamine B molecules is demonstrated by photoluminescence analysis. On the single-particle level, dark field microscopy of Au/Ag-silica nanorods was finally employed. This introduces a route towards revealing the relation between structure, shape, and optical (plasmonic) properties of complex composite metal particles as well as fabrication strategies for nanoassemblies of tailored structures in the field of nanoplasmonics.
AB - We present the synthesis and analysis of silica-coated Au/Ag bimetallic nanorods with controlled surface plasmon bands. Depending on the thickness of Ag shell deposited on the Au nanorod surface, there is a blue-shift on the longitudinal surface plasmon band of Au nanorods, which can be expressed by an approximate formula derived from the absorption profile of light in Ag films using finite difference time domain simulations. The subsequent coating of silica shell not only enhances the stability of the Au/Ag bimetallic nanorods but also provides a mesoporous host for optically active species. Minute red-shifts of the longitudinal resonance mode, induced by stepwise increased silica shell volumes, are shown. Application as carrier for fluorescent rhodamine B molecules is demonstrated by photoluminescence analysis. On the single-particle level, dark field microscopy of Au/Ag-silica nanorods was finally employed. This introduces a route towards revealing the relation between structure, shape, and optical (plasmonic) properties of complex composite metal particles as well as fabrication strategies for nanoassemblies of tailored structures in the field of nanoplasmonics.
KW - Core-shell nanorods
KW - Nanoplasmonics
KW - Optical properties
UR - http://www.scopus.com/inward/record.url?scp=84877269894&partnerID=8YFLogxK
U2 - 10.1007/s00396-012-2760-5
DO - 10.1007/s00396-012-2760-5
M3 - Article
AN - SCOPUS:84877269894
VL - 291
SP - 585
EP - 594
JO - Colloid and polymer science
JF - Colloid and polymer science
SN - 0303-402X
IS - 3
ER -