Blocking Hot Electron Emission by SiO2 Coating Plasmonic Nanostructures
| Autor: | Jeremy J. Baumberg, Kenzo Yamaguchi, Ryusuke Kagawa, Nobuyuki Takeyasu, Felix Benz, Takashi Kaneta, Masamitsu Fujii |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Analytical chemistry 02 engineering and technology engineering.material 010402 general chemistry 01 natural sciences law.invention symbols.namesake Coating law Deposition (phase transition) Molecule Physical and Theoretical Chemistry Thin film business.industry Surface plasmon 021001 nanoscience & nanotechnology Laser Surface plasmon polariton 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials General Energy engineering symbols Optoelectronics 0210 nano-technology Raman spectroscopy business |
| Zdroj: | The Journal of Physical Chemistry C. 121:18795-18799 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/acs.jpcc.7b02345 |
| Popis: | Noble metallic nanostructures provide a platform for high-sensitivity spectroscopic sensing with significantly enhanced electromagnetic fields due to surface plasmon polaritons. However, target molecules can be transformed into other molecules under irradiation with an excitation laser during the surface-enhanced measurement, which thus disturbs detection of unknown samples. In this paper, we perform Raman measurements of p-aminothiophenol on gold nanosurfaces with and without deposition of SiO2 thin films at the surface. The Raman signals are enhanced on both substrates, but the deposition of the glass thin film clearly prevents the chemical transformation. This indicates that hot electrons are effective for chemical transformation and that thin glass films are sufficient to prevent this while still benefiting from surface plasmons. |
| Databáze: | OpenAIRE |
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