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4-Mercaptobenzoic Acid Labeled Gold-Silver-Alloy-Embedded Silica Nanoparticles as an Internal Standard Containing Nanostructures for Sensitive Quantitative Thiram Detection

In this study, SiO @Au@4-MBA@Ag (4-mercaptobenzoic acid labeled gold-silver-alloy-embedded silica nanoparticles) nanomaterials were investigated for the detection of thiram, a pesticide. First, the presence of Au@4-MBA@Ag alloys on the surface of SiO was confirmed by the broad bands of ultraviolet-v...

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Published in:International journal of molecular sciences 2019-09, Vol.20 (19), p.4841
Main Authors: Pham, Xuan-Hung, Hahm, Eunil, Huynh, Kim-Hung, Son, Byung Sung, Kim, Hyung-Mo, Jeong, Dae Hong, Jun, Bong-Hyun
Format: Article
Language:English
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Summary:In this study, SiO @Au@4-MBA@Ag (4-mercaptobenzoic acid labeled gold-silver-alloy-embedded silica nanoparticles) nanomaterials were investigated for the detection of thiram, a pesticide. First, the presence of Au@4-MBA@Ag alloys on the surface of SiO was confirmed by the broad bands of ultraviolet-visible spectra in the range of 320-800 nm. The effect of the 4-MBA (4-mercaptobenzoic acid) concentration on the Ag shell deposition and its intrinsic SERS (surface-enhanced Raman scattering) signal was also studied. Ag shells were well coated on SiO @Au@4-MBA in the range of 1-1000 µM. The SERS intensity of thiram-incubated SiO @Au@4-MBA@Ag achieved the highest value by incubation with 500 µL thiram for 30 min, and SERS was measured at 200 µg/mL SiO @Au@4-MBA@Ag. Finally, the SERS intensity of thiram at 560 cm increased proportionally with the increase in thiram concentration in the range of 240-2400 ppb, with a limit of detection (LOD) of 72 ppb.
ISSN:1422-0067
1661-6596
1422-0067
DOI:10.3390/ijms20194841