Ag dendritic nanostructures for rapid detection of thiram based on surface-enhanced Raman scattering

Surface-enhanced Raman scattering (SERS) has been proven to be a powerful analytical tool for the detection of trace molecules owing to its integration of high sensitivity, unique spectroscopic fingerprint, and non-destructive data acquisition. However, the lack of reliable, stable, well-defined and...

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Bibliographic Details
Published in:RSC advances 2015-01, Vol.5 (86), p.70553-70557
Main Authors: Wang, Qiang, Wu, Dun, Chen, Zhidong
Format: Article
Language:English
Subjects:
Grapes
Juices
Nanostructure
Pesticides
Raman scattering
Residues
Silver
Thiram
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Summary:Surface-enhanced Raman scattering (SERS) has been proven to be a powerful analytical tool for the detection of trace molecules owing to its integration of high sensitivity, unique spectroscopic fingerprint, and non-destructive data acquisition. However, the lack of reliable, stable, well-defined and uniform SERS substrates impedes their further practical applications in various fields. Herein, we have developed a SERS-active substrate based on Ag dendrites for sensitive Raman signal readout and trace detection of pesticide residues in agricultural products and environments. The SERS substrate can be employed to detect rhodamine 6G (R6G) with an enhancement factor (EF) of 3.18 × 10 8 and the pesticide thiram in commercial grape juice with a detection limit of as low as 0.1 μM (0.03 ppm), which is much lower than the maximal residue limit (MRL) of 7 ppm in fruit prescribed by the U.S. Environmental Protection Agency (EPA). Furthermore, spiked detection indicated that the Ag dendritic substrate can be used to monitor thiram in commercial grape juice and natural lake water without further treatment.
ISSN:2046-2069
2046-2069
DOI:10.1039/C5RA13080H