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Nanomaterials 2017, 7(6), 146; doi:10.3390/nano7060146

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
These authors contribute equally to this work.
*
Authors to whom correspondence should be addressed.
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)
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Abstract

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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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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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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