Journal
NANOSCALE
Volume 8, Issue 10, Pages 5641-5648Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5nr08920d
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Funding
- Environmental Security and Technology Certification Program (ESTCP) of the U.S. Department of Defense
- Materials Sciences and Engineering Division, Office of Basic Energy Sciences, Office of Science
- U.S. Department of Energy
- DOE Scientific User Facilities Division
- US DOE [DE-AC05-00OR22725]
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We demonstrate large area arrays of elevated gold ellipse dimers with precisely controlled gaps for use as sensitive and highly controllable surface enhanced Raman scattering (SERS) substrates. The enhanced Raman signal observed with SERS arises from both localized and long range plasmonic effects. By controlling the geometry of a SERS substrate, in this case the size and aspect ratio of individual ellipses, the plasmon resonance can be tuned in a broad wavelength range, providing a method for designing the response of SERS substrates at different excitation wavelengths. Plasmon effects exhibited by the elevated gold ellipse dimer substrates are also demonstrated and confirmed through finite difference time domain (FDTD) simulations. A plasmon resonance red shift with an increase of the ellipse aspect ratio is observed, allowing systematic control of the resulting SERS signal intensity. Optimized elevated ellipse dimer substrates with 10 +/- 2 nm gaps exhibit uniform SERS enhancement factors on the order of 10(9) for adsorbed p-mercaptoaniline molecules.
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