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Photodeposition of Pd onto Colloidal Au Nanorods by Surface Plasmon Excitation
Published on: August 15, 2019
Bimetallic gold-silver nanorods produce multiple surface plasmon bands
Sungwan Kim1, Seong Kyu Kim, Sungho Park
1Department of Chemistry, Sungkyunkwan University, Suwon 440-746, South Korea.
Journal of the American Chemical Society
|May 30, 2009
Summary
We studied gold and silver nanorods, finding that controlling their length tunes optical properties. Strong coupling between gold and silver blocks creates collective light modes, showing coherent electron oscillations along the nanorod length.
Area of Science:
- Nanotechnology
- Materials Science
- Plasmonics
Background:
- Two-component nanorods (NRs) offer tunable optical properties.
- Controlling the composition and dimensions of NRs is crucial for manipulating their plasmonic behavior.
Purpose of the Study:
- Investigate the optical properties of gold (Au) and silver (Ag) two-component nanorods.
- Understand how varying block lengths influence the plasmonic modes.
- Explore the coupling effects between Au and Ag components on optical responses.
Main Methods:
- Fabrication of two-component Au-Ag nanorods with controlled block lengths.
- Optical characterization using spectroscopy to analyze plasmonic modes.
- Analysis of electron oscillation patterns based on observed optical properties.
Main Results:
- Observed two independent transverse plasmon modes within the Au and Ag blocks.
- Tuned the intensity of transverse modes by altering the relative fraction of Au and Ag blocks without significant peak shifts.
- Demonstrated the collective appearance of longitudinal localized surface plasmon (LSP) modes, including higher-order modes, due to strong intraparticle coupling.
- Identified coherent oscillation of free electrons along the long axis of NRs.
Conclusions:
- The optical properties of Au-Ag NRs are effectively tailored by controlling block lengths.
- Strong inter-component plasmon coupling leads to collective longitudinal LSP modes.
- Free electrons exhibit coherent oscillation along the nanorod's long axis, indicating directional coupling.
