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- Title
Highly Sensitive Magnetic-SERS Dual-Function Silica Nanoprobes for Effective On-Site Organic Chemical Detection.
- Authors
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
- 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.
- Subjects
SILICA nanoparticles; ORGANIC compounds; SERS spectroscopy
- Publication
Nanomaterials (2079-4991), 2017, Vol 7, Issue 6, p146
- ISSN
2079-4991
- Publication type
Article
- DOI
10.3390/nano7060146