TY - JOUR
T1 - Towards enhanced optical sensor performance
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
.
UR - http://www.scopus.com/inward/record.url?scp=85015150211&partnerID=8YFLogxK
UR - https://pubs.rsc.org/en/content/articlelanding/2017/AN/C6AN02596J#!divAbstract
U2 - 10.1039/c6an02596j
DO - 10.1039/c6an02596j
M3 - Article
AN - SCOPUS:85015150211
SN - 0003-2654
VL - 142
SP - 951
EP - 958
JO - Analyst
JF - Analyst
IS - 6
ER -