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Self-Organized Freestanding One-Dimensional Au Nanoparticle Arrays
Myungkoo Kang1, Yu Yuwen1, Wenchong Hu1
1Department of Electrical Engineering, Pennsylvania State University , University Park, Pennsylvania 16802, United States.
ACS Nano
|June 6, 2017
Summary
Freestanding silicon dioxide (SiO2) nanowires with embedded gold (Au) nanoparticle arrays were created. This method allows independent control over nanoparticle size and spacing for advanced plasmonic devices.
Area of Science:
- Materials Science
- Nanotechnology
- Optics
Background:
- One-dimensional (1D) nanomaterials offer unique properties for advanced applications.
- Controlling the arrangement and size of metallic nanoparticles is crucial for tuning plasmonic behavior.
Purpose of the Study:
- To develop a versatile method for fabricating 1D gold (Au) nanoparticle arrays within silicon dioxide (SiO2) nanowires.
- To achieve independent control over nanoparticle diameter and interparticle spacing.
Main Methods:
- Fabrication via thermal oxidation of gold-coated silicon (Si) nanowires with controlled diameter and surface modulation.
- Characterization using scanning transmission electron microscopy (STEM) and electron energy loss spectroscopy (EELS).
- Analysis of optical absorption and plasmonic response.
Main Results:
- Successfully synthesized 1D Au nanoparticle arrays encapsulated in freestanding SiO2 nanowires.
- Demonstrated independent control over nanoparticle diameter and interparticle spacing.
- Observed a strong plasmonic response at 550 nm, confirmed by STEM-EELS.
- Identified plasmonic excitation enhancement between nanoparticles.
Conclusions:
- The developed method provides a versatile route for synthesizing 1D Au nanoparticle arrays.
- Independent control over nanoparticle dimensions enables enhanced design flexibility for plasmonic devices.
- This approach offers cost-effectiveness for future plasmonic device development.
