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Open AccessArticle

Highly Sensitive Magnetic-SERS Dual-Function Silica Nanoprobes for Effective On-Site Organic Chemical Detection

1
School of Chemical and Biological Engineering, Seoul National University, Seoul 151-742, Korea
2
Department of Bioscience and Biotechnology, Konkuk University, Seoul 143-701, Korea
3
Department of Chemistry Education, Seoul National University, Seoul 151-742, Korea
*
Authors to whom correspondence should be addressed.
These authors contribute equally to this work.
Nanomaterials 2017, 7(6), 146; https://doi.org/10.3390/nano7060146
Received: 13 May 2017 / Revised: 7 June 2017 / Accepted: 9 June 2017 / Published: 13 June 2017
(This article belongs to the Special Issue Nanomaterials for SERS Applications)
We report magnetic silver nanoshells (M-AgNSs) that have both magnetic and SERS properties for SERS-based detection. The M-AgNSs are composed of hundreds of Fe3O4 nanoparticles for rapid accumulation and bumpy silver shell for sensitive SERS detection by near-infrared laser excitation. The intensity of the SERS signal from the M-AgNSs was strong enough to provide single particle-level detection. We obtained much stronger SERS signal intensity from the aggregated M-AgNSs than from the non-aggregated AgNSs. 4-Fluorothiophenol was detected at concentrations as low as 1 nM, which corresponds to 0.16 ppb. The limit of detection for tetramethylthiuram disulfide was 10 μM, which corresponds to 3 ppm. The M-AgNSs can be used to detect trace amounts of organic molecules using a portable Raman system. View Full-Text
Keywords: surface-enhanced Raman scattering; magnetic aggregation; on-site detection surface-enhanced Raman scattering; magnetic aggregation; on-site detection
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MDPI and ACS Style

Jeong, C.; Kim, H.-M.; Park, S.Y.; Cha, M.G.; Park, S.-J.; Kyeong, S.; Pham, X.-H.; Hahm, E.; Ha, Y.; Jeong, D.H.; Jun, B.-H.; Lee, Y.-S. Highly Sensitive Magnetic-SERS Dual-Function Silica Nanoprobes for Effective On-Site Organic Chemical Detection. Nanomaterials 2017, 7, 146.

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