Towards enhanced optical sensor performance : SEIRA and SERS with plasmonic nanostars
Bibikova, O.; Haas, J.; López-Lorente, A. I.; Popov, A.; Kinnunen, M.; Meglinski, I.; Mizaikoff, B. (2017-02-08)
Bibikova, O. and Haas, J. and López-Lorente, A. I. and Popov, A. and Kinnunen, M. and Meglinski, I. and Mizaikoff, B., Towards enhanced optical sensor performance: SEIRA and SERS with plasmonic nanostars, Analyst, 2017, 142:6, p. 951-958. https://doi.org/10.1039/C6AN02596J
© The Royal Society of Chemistry 2017. This is the author's version of the work. It is posted here for your personal use. Not for redistribution. The definitive Version of Record was published in Analyst, https://doi.org/10.1039/c6an02596j.
https://rightsstatements.org/vocab/InC/1.0/
https://urn.fi/URN:NBN:fi-fe2019042913578
Tiivistelmä
Abstract
We report the preparation and characterization of plasmonic chip-based systems comprising self-assembled gold nanostars at silicon substrates that enable concomitantly enhanced Raman (surface enhanced Raman spectroscopy; SERS) and mid-infrared (surface enhanced infrared reflection or absorption spectroscopy; SEIRA) spectral signatures. The high-aspect-ratio structure of gold nanostars provides an increased number of hot spots at their surface, which results in an electric field enhancement around the nanomaterial. Gold nanostars were immobilized at a silicon substrate via a thin gold layer, and α-ω-dimercapto polyethylene glycol (SH-PEG-SH) linkers. The Raman and IR spectra of crystal violet (CV) revealed a noticeable enhancement of the analyte vibrational signal intensity in SERS and SEIRA studies resulting from the presence of the nanostars. Enhancement factors of 2.5 × 103 and 2.3 × 103 were calculated in SERS considering the CV bands at 1374.9 cm−1 and 1181 cm−1, respectively; for SEIRA, an enhancement factor of 5.36 was achieved considering the CV band at 1585 cm−1.
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