期刊
ANALYST
卷 142, 期 6, 页码 951-958出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6an02596j
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资金
- Infotech Oulu Graduate School
- International Graduate School in Molecular Medicine Ulm (IGradU) within the program Tissue Homeostasis: Development, Aging and Regeneration, TissueHome
- Horizon 2020 Framework Program of the European Union within the MSCA RISE Project TROPSENSE
- academy of Finland [260321, 290596]
- Government of Russian Federation [074-U01]
- Academy of Finland (AKA) [290596, 290596] Funding Source: Academy of Finland (AKA)
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 alpha-omega-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 x 10(3) and 2.3 x 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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