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

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

doi:10.1039/c6an02596j

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

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

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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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 .

Original language	English
Pages (from-to)	951-958
Number of pages	8
Journal	Analyst
Volume	142
Issue number	6
Early online date	8 Feb 2017
DOIs	https://doi.org/10.1039/c6an02596j
Publication status	Published - 21 Mar 2017

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10.1039/c6an02596j

Towards enhanced optical sensor performance
© 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.
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title = "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 . ",

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T2 - SEIRA and SERS with plasmonic nanostars

AU - Bibikova, O.

AU - Haas, J.

AU - López-Lorente, A. I.

AU - Popov, A.

AU - Kinnunen, M.

AU - Meglinski, I.

AU - Mizaikoff, B.

N1 - © The Royal Society of Chemistry 2017. The definitive Version of Record was published in Analyst, https://doi.org/10.1039/c6an02596j.

PY - 2017/3/21

Y1 - 2017/3/21

N2 - 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 .

AB - 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 .

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

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