Abstract
Aggregates of Au nanoshells on silicon substrates with plasmon resonances tuned to the infrared region of the spectrum provide a remarkably high-quality substrate for surface enhanced infrared absorption (SEIRA) spectroscopy. SEIRA spectra spanning the chemical fingerprint region of 700–3300 cm −1 with strong enhancement across this entire spectral range are obtained. SEIRA enhancement factors obtained for para-mercaptoaniline on these substrates are evaluated to be in the 10 4 range, based on a statistical evaluation of aggregate geometries combined with finite difference time domain modeling of the infrared ‘hot spots’ characteristic of the constituent structures.
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