Periodic ZnO-Elevated Gold Dimer Nanostructures for Surface-Enhanced Raman Scattering Applications
Journal
Journal of Physical Chemistry C
Journal Volume
122
Journal Issue
47
Pages
27016-27023
Date Issued
2018
Author(s)
Abstract
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 in agreement with SERS measurements. Our hybrid substrates combining the plasmonic nanocavity effect with charge transfer across the heterojunction denoted the potential candidate for SERS applications. ? 2018 American Chemical Society.
SDGs
Type
journal article