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

O. Bibikova, J. Haas, A. I. López-Lorente, Alexey Popov, M. Kinnunen, I. Meglinski, B. Mizaikoff

Research output: Contribution to journalArticleScientificpeer-review

28 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)951-958
JournalAnalyst
Volume142
Issue number6
DOIs
Publication statusPublished - 21 Mar 2017
MoE publication typeA1 Journal article-refereed

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