期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 344, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2021.130304
关键词
Antagonistic action; Anti-etching; Colorimetric detection; Thiram; Soil; Triangular silver nanoplates
资金
- Natural Science Basic Research Plan in Shaanxi Province of China [2019JQ859]
- China Postdoctoral Science Foundation [2019M653864]
- National Natural Science Foundation of China [61903298]
- Key Research and Development Plan in Agricultural Field of Shaanxi Province [2017NY129]
- Scientific Research Pro-gram of Shaanxi Provincial Education Committee [17JK0708]
- Innovation Capability Support Program of Shaanxi [2020TD-024]
- State Key Laboratory of Supramolecular Structure and Materials [sklssm202030]
A colorimetric detection method based on triangular silver nanoplates was proposed, which achieves high sensitivity and anti-interference ability, showing great potential in analyzing thiram in specimens.
The noble metal nanoparticles-based colorimetric detection can simply determine the concentration of the substances by naked eyes, but difficultly resolve the conflict between sensitivity and anti-interference ability. Herein, a triangular silver nanoplates (TSNPs)-based anti-etching colorimetric detection method for analyzing thiram was proposed by regulating the antagonistic action between the protection of thiram and the etching of Ion TSNPs. The internal mechanism of etching induced peak shift of TSNPs was revealed by the discrete dipole approximation method. The effect of thiram and I- on the color of TSNPs was systematically studied. As a consequence, this method not only shows a limit of detection of 19.7 nM in the linear range of 0.025-0.35 mu M by absorption spectroscopy, but also produces sensitive color changes for the detection by naked eyes. Especially, it shows good selectivity that can resist the interference of other substances including other pesticides and halide ions in the specimens. It also shows excellent applicability in the detection of thiram residues in soil. This work provides a potential device-free strategy for the application of colorimetric detection in specimens with lots of interfering substances.
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