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Robust LSPR Sensing Using Thermally Embedded Au Nanoparticles in Glass Substrates.
Nuno M Figueiredo1, Ricardo Serra1, Albano Cavaleiro1,2
1CEMMPRE-Department of Mechanical Engineering, University of Coimbra, Rua Luís Reis Santos, 3030-788 Coimbra, Portugal.
Nanomaterials (Basel, Switzerland)
|July 2, 2021
Summary
We developed robust gold nanostructures on glass for enhanced localized surface plasmon resonance (LSPR) sensors. Thermal embedding ensures strong adhesion and stability, improving sensor performance and longevity.
Area of Science:
- Materials Science
- Nanotechnology
- Plasmonics
Background:
- Poor adhesion and stability of plasmonic nanostructures limit localized surface plasmon resonance (LSPR) system development.
- Robust nanostructures are crucial for reliable LSPR-based sensing applications.
Purpose of the Study:
- To enhance the adhesion and thermal stability of gold (Au) nanostructures on glass substrates.
- To develop robust LSPR sensors with improved longevity and performance.
Main Methods:
- Deposited Au nanolayers above the percolation limit on glass substrates.
- Utilized thermal annealing above the glass transition temperature to induce dewetting, recrystallization, and NP embedding.
- Characterized the optical properties and refractive index sensitivity (RIS) of the embedded nanostructures.
Main Results:
- Achieved strong adhesion of Au nanoparticles (NPs) via partial embedding in glass, resisting cleaning and adhesion tests.
- Observed strong optical scattering bands with redshifted LSPR peaks and increasing width correlated with Au content.
- Obtained high RIS values (150–360 nm/RIU for band edge, 32–72 nm/RIU for peak position) for samples with narrow LSPR extinction bands.
Conclusions:
- Thermally embedded Au NPs offer a robust solution for LSPR sensor fabrication.
- The developed LSPR sensors demonstrate high sensitivity and stability, suitable for simple reflectance measurements.
