Plasmon-Enhanced Electron Harvesting in Robust Titanium Nitride Nanostructures
| Autor: | Brock Doiron, Neil McN. Alford, Peter K. Petrov, Rupert F. Oulton, Yi Li, Ryan Bower, Stefan A. Maier, Andrei P. Mihai |
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| Přispěvatelé: | Engineering & Physical Science Research Council (E |
| Rok vydání: | 2019 |
| Předmět: |
Nanostructure
Materials science Physics::Optics chemistry.chemical_element Infrared spectroscopy 02 engineering and technology 010402 general chemistry Physical Chemistry 01 natural sciences 09 Engineering Condensed Matter::Materials Science symbols.namesake chemistry.chemical_compound 10 Technology Physics::Atomic and Molecular Clusters Physical and Theoretical Chemistry Spectroscopy Plasmon business.industry 021001 nanoscience & nanotechnology Titanium nitride 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials General Energy chemistry symbols Optoelectronics 03 Chemical Sciences 0210 nano-technology business Tin Raman spectroscopy Localized surface plasmon |
| Zdroj: | The Journal of Physical Chemistry C. 123:18521-18527 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/acs.jpcc.9b03184 |
| Popis: | Titanium nitride (TiN) continues to prove itself as an inexpensive, robust, and efficient alternative to gold in plasmonic applications. Notably, TiN has improved hot electron-harvesting and photocatalytic abilities compared to gold systems, which we recently attributed to the role of oxygen in TiN and its native semiconducting TiO2–x surface layer. Here, we explore the role of localized surface plasmon resonances (LSPRs) on electron harvesting across the TiN/TiO2–x interface and probe the resilience of TiN nanostructures under high-power laser illumination. To investigate this, we fabricate TiN strips, in which the lateral confinement allows for the polarization-selective excitation of the LSPR. Using ultrafast pump–probe spectroscopy, optical characterization, and Raman vibrational spectroscopy, we relate the differences and changes observed in the electron behavior to specific material properties. We observe plasmon-enhanced electron harvesting beyond what is expected resulting from the enhanced absorption of the plasmonic mode. We accredit this to the surface oxide damping the plasmon resonance, providing additional nonradiative loss channels. Subsequently, we show that low-power annealing of the surface oxide layer reduces the trap density at the interface and increases the initial harvested electron concentration. The unique properties of TiN make it important in the future development of plasmonic electron-harvesting applications. |
| Databáze: | OpenAIRE |
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