Surface enhanced infrared absorption spectroscopy based on gold nanostars and spherical nanoparticles

Olga Bibikova, Julian Haas, Ángela I. López-Lorente, Alexey Popov, Matti Kinnunen, Yury Ryabchikov, Andrei Kabashin, Igor Meglinski, Boris Mizaikoff*

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

Plasmonic anisotropic nanoparticles possess a number of hot spots on their surface due to the presence of sharp edges, tips or vertices, leading to a high electric field strength surrounding the nanostructures. In this paper, we explore different plasmonic nanostructures, including anisotropic gold nanostars (AuNSts) and spherical gold nanoparticles, in surface-enhanced infrared absorption spectroscopy (SEIRAS) in an attenuated total reflection (ATR) configuration. In our experiments, we observed up to 10-times enhancement of the infrared (IR) absorption of thioglycolic acid (TGA) and up to 2-times enhancement of signals for bovine serum albumin (BSA) protein on plasmonic nanostructure-based films deposited on a silicon (Si) internal reflection element (IRE) compared to bare Si IRE. The dependence of the observed enhancement on the amount of AuNSts present at the surface of the IRE has been demonstrated. Quantitative studies with both, TGA and BSA were performed, observing that the SEIRA signal can be correlated to the concentration of analyte molecules present within the evanescent field. The calibration curves in the presence of the AuNSts showed enhanced sensitivity as compared with the bare Si IRE. We finally compare efficiencies of anisotropic AuNSts and spherical citrate-capped and “bare” laser-synthesized gold nanoparticles as SEIRAS substrates for the detection of TGA and BSA. The signal obtained from AuNSts was at least 2 times higher for TGA molecules in comparison with spherical gold nanoparticles, which was explained by a more efficient generation of hot spots on anisotropic surface due to the presence of sharp edges, tips or vertices, leading to a high electric field strength surrounding the AuNSts.

Original languageEnglish
Pages (from-to)141-149
Number of pages9
JournalAnalytica Chimica Acta
Volume990
Early online date26 Jul 2017
DOIs
Publication statusPublished - 16 Oct 2017

Fingerprint

Infrared absorption
atomic absorption spectroscopy
Absorption spectroscopy
infrared spectroscopy
Gold
Nanoparticles
Nanostructures
Infrared spectroscopy
Spectrum Analysis
Silicon
Bovine Serum Albumin
gold
silicon
serum
acid
electric field
Electric fields
Evanescent fields
Molecules
Citric Acid

Keywords

  • FTIR spectroscopy
  • Gold nanospheres
  • Gold nanostars
  • Plasmonic
  • SEIRAS

Cite this

Bibikova, O., Haas, J., López-Lorente, Á. I., Popov, A., Kinnunen, M., Ryabchikov, Y., ... Mizaikoff, B. (2017). Surface enhanced infrared absorption spectroscopy based on gold nanostars and spherical nanoparticles. Analytica Chimica Acta, 990, 141-149. https://doi.org/10.1016/j.aca.2017.07.045
Bibikova, Olga ; Haas, Julian ; López-Lorente, Ángela I. ; Popov, Alexey ; Kinnunen, Matti ; Ryabchikov, Yury ; Kabashin, Andrei ; Meglinski, Igor ; Mizaikoff, Boris. / Surface enhanced infrared absorption spectroscopy based on gold nanostars and spherical nanoparticles. In: Analytica Chimica Acta. 2017 ; Vol. 990. pp. 141-149.
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Bibikova, O, Haas, J, López-Lorente, ÁI, Popov, A, Kinnunen, M, Ryabchikov, Y, Kabashin, A, Meglinski, I & Mizaikoff, B 2017, 'Surface enhanced infrared absorption spectroscopy based on gold nanostars and spherical nanoparticles', Analytica Chimica Acta, vol. 990, pp. 141-149. https://doi.org/10.1016/j.aca.2017.07.045

Surface enhanced infrared absorption spectroscopy based on gold nanostars and spherical nanoparticles. / Bibikova, Olga; Haas, Julian; López-Lorente, Ángela I.; Popov, Alexey; Kinnunen, Matti; Ryabchikov, Yury; Kabashin, Andrei; Meglinski, Igor; Mizaikoff, Boris.

In: Analytica Chimica Acta, Vol. 990, 16.10.2017, p. 141-149.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Surface enhanced infrared absorption spectroscopy based on gold nanostars and spherical nanoparticles

AU - Bibikova, Olga

AU - Haas, Julian

AU - López-Lorente, Ángela I.

AU - Popov, Alexey

AU - Kinnunen, Matti

AU - Ryabchikov, Yury

AU - Kabashin, Andrei

AU - Meglinski, Igor

AU - Mizaikoff, Boris

PY - 2017/10/16

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N2 - Plasmonic anisotropic nanoparticles possess a number of hot spots on their surface due to the presence of sharp edges, tips or vertices, leading to a high electric field strength surrounding the nanostructures. In this paper, we explore different plasmonic nanostructures, including anisotropic gold nanostars (AuNSts) and spherical gold nanoparticles, in surface-enhanced infrared absorption spectroscopy (SEIRAS) in an attenuated total reflection (ATR) configuration. In our experiments, we observed up to 10-times enhancement of the infrared (IR) absorption of thioglycolic acid (TGA) and up to 2-times enhancement of signals for bovine serum albumin (BSA) protein on plasmonic nanostructure-based films deposited on a silicon (Si) internal reflection element (IRE) compared to bare Si IRE. The dependence of the observed enhancement on the amount of AuNSts present at the surface of the IRE has been demonstrated. Quantitative studies with both, TGA and BSA were performed, observing that the SEIRA signal can be correlated to the concentration of analyte molecules present within the evanescent field. The calibration curves in the presence of the AuNSts showed enhanced sensitivity as compared with the bare Si IRE. We finally compare efficiencies of anisotropic AuNSts and spherical citrate-capped and “bare” laser-synthesized gold nanoparticles as SEIRAS substrates for the detection of TGA and BSA. The signal obtained from AuNSts was at least 2 times higher for TGA molecules in comparison with spherical gold nanoparticles, which was explained by a more efficient generation of hot spots on anisotropic surface due to the presence of sharp edges, tips or vertices, leading to a high electric field strength surrounding the AuNSts.

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Bibikova O, Haas J, López-Lorente ÁI, Popov A, Kinnunen M, Ryabchikov Y et al. Surface enhanced infrared absorption spectroscopy based on gold nanostars and spherical nanoparticles. Analytica Chimica Acta. 2017 Oct 16;990:141-149. https://doi.org/10.1016/j.aca.2017.07.045