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Asymmetrical Plasmon Distribution in Hybrid AuAg Hollow/Solid Coded Nanotubes.
Aziz Genç1, Javier Patarroyo1, Jordi Sancho-Parramon2
1Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus Universitat Autònoma de Barcelona, 08193 Barcelona, Spain.
Nanomaterials (Basel, Switzerland)
|March 29, 2023
Summary
Nanoengineering of gold-silver (AuAg) nanotubes enables tailored plasmonic properties. Hybrid nanotubes offer distinct localized surface plasmon resonance (LSPR) modes from solid and hollow segments, allowing for tunable plasmonic responses.
Area of Science:
- Nanotechnology
- Materials Science
- Plasmonics
Background:
- Nanoscale morphological control is crucial for designing materials with specific plasmonic properties.
- One-dimensional (1D) nanostructures, such as nanotubes, offer unique platforms for plasmonic applications.
Purpose of the Study:
- To investigate the nanoengineering of plasmon resonances in two types of 1D AuAg nanotubes: fully hollow and hybrid structures.
- To understand the influence of morphology on plasmonic behavior and explore possibilities for tunable plasmonic responses.
Main Methods:
- Fabrication of hollow and hybrid AuAg nanotubes.
- Spatially resolved plasmon mapping using electron energy loss spectroscopy (EELS).
- Numerical simulations using the boundary element method (BEM).
Main Results:
- EELS revealed high-order resonator-like and localized surface plasmon resonance (LSPR) modes in both nanotube types.
- Experimental findings were in excellent agreement with BEM simulations.
- Plasmon hybridization within the nanotubes led to intense plasmon resonances inside the structures.
- Hybrid AuAg nanotubes exhibited distinct LSPRs from both solid and hollow segments.
- Plasmon hybridization disrupted the periodicity of high-order modes, causing asymmetrical plasmon distribution.
Conclusions:
- Hybrid AuAg nanotubes provide a single nanostructure capable of generating a broad range of plasmon resonances.
- The asymmetry in plasmon distribution can be engineered for applications in coded plasmonic nanotubes.
- Nanoengineering of nanotube morphology offers a pathway to precisely control plasmonic properties.
