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

Cheolhwan Jeong; Hyung-Mo Kim; So Yeon Park; Myeong Geun Cha; Sung-Jun Park; San Kyeong; Xuan-Hung Pham; Eunil Hahm; Yuna Ha; Dae Hong Jeong; Bong-Hyun Jun; Yoon-Sik Lee

doi:10.3390/nano7060146

Nanomaterials (Jun 2017)

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

Cheolhwan Jeong,
Hyung-Mo Kim,
So Yeon Park,
Myeong Geun Cha,
Sung-Jun Park,
San Kyeong,
Xuan-Hung Pham,
Eunil Hahm,
Yuna Ha,
Dae Hong Jeong,
Bong-Hyun Jun,
Yoon-Sik Lee

Affiliations

Cheolhwan Jeong: School of Chemical and Biological Engineering, Seoul National University, Seoul 151-742, Korea
Hyung-Mo Kim: Department of Bioscience and Biotechnology, Konkuk University, Seoul 143-701, Korea
So Yeon Park: School of Chemical and Biological Engineering, Seoul National University, Seoul 151-742, Korea
Myeong Geun Cha: Department of Chemistry Education, Seoul National University, Seoul 151-742, Korea
Sung-Jun Park: School of Chemical and Biological Engineering, Seoul National University, Seoul 151-742, Korea
San Kyeong: School of Chemical and Biological Engineering, Seoul National University, Seoul 151-742, Korea
Xuan-Hung Pham: Department of Bioscience and Biotechnology, Konkuk University, Seoul 143-701, Korea
Eunil Hahm: Department of Bioscience and Biotechnology, Konkuk University, Seoul 143-701, Korea
Yuna Ha: Department of Bioscience and Biotechnology, Konkuk University, Seoul 143-701, Korea
Dae Hong Jeong: Department of Chemistry Education, Seoul National University, Seoul 151-742, Korea
Bong-Hyun Jun: Department of Bioscience and Biotechnology, Konkuk University, Seoul 143-701, Korea
Yoon-Sik Lee: School of Chemical and Biological Engineering, Seoul National University, Seoul 151-742, Korea

DOI: https://doi.org/10.3390/nano7060146
Journal volume & issue: Vol. 7, no. 6
p. 146

Abstract

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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.

Published in Nanomaterials

ISSN: 2079-4991 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Science: Chemistry
Website: https://www.mdpi.com/journal/nanomaterials

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