Silver nanoparticle-assembled micro-bowl arrays for sensitive SERS detection of pesticide residue
Autor: | Fangming Han, Chuhong Zhu, Guowen Meng, Xiaoye Hu, Qiangsheng Zhao, Xiujuan Wang, Yong Lei |
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Rok vydání: | 2020 |
Předmět: |
Materials science
Analytical chemistry Bioengineering 02 engineering and technology 010402 general chemistry 01 natural sciences Silver nanoparticle Rhodamine 6G chemistry.chemical_compound symbols.namesake Monolayer media_common.cataloged_instance General Materials Science Electrical and Electronic Engineering European union media_common Reproducibility Pesticide residue Mechanical Engineering General Chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences chemistry Mechanics of Materials symbols Polystyrene 0210 nano-technology Raman scattering |
Zdroj: | Nanotechnology. 31(20) |
ISSN: | 1361-6528 |
Popis: | It is of great significance to develop a simple and effective method for constructing large-scale high-quality surface-enhanced Raman scattering (SERS) substrate. Here, an Ag nanoparticle-assembled micro-bowl array was prepared by a close-packed polystyrene (PS) sphere monolayer templated electrodeposition approach. The fabricated Ag nanoparticle-assembled micro-bowl array shows high SERS sensitivity to rhodamine 6G (R6G) under an ultra-low concentration of 1 fM, and exhibits excellent SERS spectral uniformity with a small relative standard deviation (RSD) of 7.6% and good reproducibility (a RSD ∼8.2% for the average peak intensities from different batches of SERS substrates). The fabricated micro-bowl array SERS substrate was employed to detect pesticide residue (thiram and methyl parathion) on vegetables. The limit of detections (LODs) for the two pesticides are lower than the maximum residue limits (MRLs) set by the European Union respectively, showing promising application in rapid inspection of food safety. |
Databáze: | OpenAIRE |
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