Towards enhanced optical sensor performance:SEIRA and SERS with plasmonic nanostars

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 × 10 3 and 2.3 × 10 3 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 .

Publication DOI: https://doi.org/10.1039/c6an02596j
Divisions: College of Engineering & Physical Sciences > School of Engineering and Technology > Mechanical, Biomedical & Design
College of Engineering & Physical Sciences
Additional Information: © The Royal Society of Chemistry 2017. The definitive Version of Record was published in Analyst, https://doi.org/10.1039/c6an02596j.
Uncontrolled Keywords: Analytical Chemistry,Biochemistry,Environmental Chemistry,Spectroscopy,Electrochemistry
Publication ISSN: 1364-5528
Full Text Link:
Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
https://pubs.rs ... 6J#!divAbstract (Publisher URL)
PURE Output Type: Article
Published Date: 2017-03-21
Published Online Date: 2017-02-08
Accepted Date: 2017-02-07
Authors: Bibikova, O.
Haas, J.
López-Lorente, A. I.
Popov, A.
Kinnunen, M.
Meglinski, I. (ORCID Profile 0000-0002-7613-8191)
Mizaikoff, B.

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