Near-Electric-Field Tuned Plasmonic Au@SiO2 and Ag@SiO2 Nanoparticles for Efficient Utilization in Luminescence Enhancement and Surface-Enhanced Spectroscopy
| Autor: | Umapada Pal, Ovidio Peña-Rodríguez, José Luis Montaño-Priede |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Nanostructure
Materials science Physics::Optics Nanoparticle Nanotechnology 02 engineering and technology Dielectric 010402 general chemistry 01 natural sciences symbols.namesake Physical and Theoretical Chemistry Spectroscopy Plasmon business.industry Surface plasmon 021001 nanoscience & nanotechnology 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials General Energy symbols Optoelectronics 0210 nano-technology business Luminescence Raman scattering |
| Zdroj: | The Journal of Physical Chemistry C. 121:23062-23071 |
| ISSN: | 1932-7455 1932-7447 |
| Popis: | Application of core–shell plasmonic nanostructures in fluorescence enhancement and surface-enhanced Raman scattering (SERS) strongly depends on their near-field electrodynamical environments. A nonradiative energy transfer takes place between fluorescent molecules and surface plasmon when they are too close. However, for a dielectric shell, the SERS intensity of analytes decreases exponentially beyond 2 nm thickness. Although electromagnetic-field enhancement due to surface plasmon still occurs at longer distances from the metal core, it needs a proper design of the composite nanostructure to exploit this advantage, and an optimal distance between the metal-core and analyte/fluorescent molecule still seems necessary. We analyze, both theoretically and experimentally, the near-electric-field (NEF) distributions in the proximity of the core–shell and shell–medium interfaces of Au@SiO2 and Ag@SiO2 core–shell structures immersed in common dispersing media such as air, water, and DMSO to investigate the effect... |
| Databáze: | OpenAIRE |
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