Preprint Article Version 1 This version is not peer-reviewed

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

Version 1 : Received: 13 May 2017 / Approved: 15 May 2017 / Online: 15 May 2017 (11:53:34 CEST)

A peer-reviewed article of this Preprint also exists.

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. 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.

Journal reference: Nanomaterials 2017, 7, 146
DOI: 10.3390/nano7060146

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.

Subject Areas

surface-enhanced Raman scattering; magnetic aggregation; on-site detection

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