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Thermally Robust Plasmonic Nanorings from Titanium Nitride
Xavier Baami González1, Paul Maurice Leidinger1, Bruno Rente2
1Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Gustav Wieds Vej 14, 8000 Aarhus, Denmark.
ACS Omega
|October 13, 2025
Summary
Titanium nitride (TiN) nanorings offer a thermally stable alternative to noble metals for plasmonic applications. These nanorings maintain their structure and optical properties at high temperatures, enabling robust sensing in harsh environments.
Area of Science:
- Materials Science
- Nanotechnology
- Optoelectronics
Background:
- Plasmonic nanostructures enhance electromagnetic fields for applications like sensing and therapy.
- Nanorings offer unique plasmonic properties due to their hollow-core geometry.
- Conventional plasmonic materials (gold, silver, copper) lack thermal stability for high-temperature applications.
Purpose of the Study:
- Investigate titanium nitride (TiN) as a thermally stable material for plasmonic nanorings.
- Develop a scalable fabrication method for TiN nanorings.
- Evaluate the high-temperature performance of TiN nanorings for sensing applications.
Main Methods:
- Fabrication of TiN nanorings using Hole-mask Colloidal Lithography (HCL).
- Annealing experiments up to 400 °C in air to test thermal stability.
- Structural and spectral analysis of TiN nanorings before and after annealing.
Main Results:
- Successfully fabricated well-defined TiN nanorings over large areas using HCL.
- TiN nanorings maintained their morphology and localized surface plasmon resonance (LSPR) after annealing at 400 °C.
- Demonstrated superior thermal stability compared to noble-metal nanostructures.
Conclusions:
- TiN is a viable refractory material for fabricating thermally stable plasmonic nanorings.
- HCL provides a scalable and cost-effective route for producing these nanostructures.
- TiN nanorings show significant potential for robust high-temperature sensing platforms.
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