Periodic ZnO-Elevated Gold Dimer Nanostructures for Surface-Enhanced Raman Scattering Applications
| Autor: | Chun-Hway Hsueh, Hsin-Chia Ho, Chun-An Wang |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Dimer Physics::Optics 02 engineering and technology 010402 general chemistry 01 natural sciences Molecular physics Condensed Matter::Materials Science chemistry.chemical_compound symbols.namesake Electric field Physics::Atomic and Molecular Clusters Physical and Theoretical Chemistry Surface plasmon resonance Plasmon Scattering 021001 nanoscience & nanotechnology 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials General Energy chemistry symbols Nanorod 0210 nano-technology Raman spectroscopy Raman scattering |
| Zdroj: | The Journal of Physical Chemistry C. 122:27016-27023 |
| ISSN: | 1932-7455 1932-7447 |
| Popis: | Electron beam lithography-defined periodic ZnO-elevated gold dimer nanostructures for surface-enhanced Raman spectroscopy with strong electromagnetic field enhancements were fabricated in the present work. The ZnO nanorods (NRs) were grown on the patterned substrate using a hydrothermal process, and Au dimers were deposited on the top surface of ZnO NRs, forming suspended gold dimers and providing plasmonic hot-spots with nanocavity effect. Effects of the dimer radius, gap size, and ZnO NR height on the dark-field scattering spectra and surface-enhanced Raman scattering (SERS) were investigated experimentally and theoretically. The SERS response was enhanced with increasing dimer radius and decreasing gap size. The SERS enhancement factor (EF) due to the localized surface plasmon resonance was calculated from simulation results. The calculated EF as a function of ZnO NR height showed the periodic trend of electric field intensity with the periodicity of about half of the exciting laser wavelength, and was... |
| Databáze: | OpenAIRE |
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