Enhanced pesticides’ limit of detection using bimetallic alloys nanoparticles
| Autor: | Doaa Sulaiman, Alwan M. Alwan, Walid K. Hamoudi |
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| Rok vydání: | 2021 |
| Předmět: |
Detection limit
Materials science Alloy Analytical chemistry Nanoparticle engineering.material Condensed Matter Physics Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Field emission microscopy symbols.namesake Etching symbols engineering Electrical and Electronic Engineering Raman spectroscopy Bimetallic strip Power density |
| Zdroj: | Journal of Materials Science: Materials in Electronics. 32:18689-18698 |
| ISSN: | 1573-482X 0957-4522 |
| DOI: | 10.1007/s10854-021-06381-9 |
| Popis: | Bimetallic (Ag-Pd and Au–Pd) alloys nanoparticles were synthesized for sensitive, rapid characterization and very low concentration of pesticides. Pulsed laser-induced etching at 500 mW/cm2 power density and 20% laser duty cycle was performed in order to prepare based Si nano-pillars substrates with high density of ion reduction sites and excellent uniformity. Bimetallic Ag-Pd and Au–Pd alloys/Si nano-pillars SERS sensors were obtained by simple immersion of Si nano-pillars in a mixture of HAuCl4, AgNO3 and PdCl2 solutions. The sensors were tested by Atomic force microscope (AFM), field emission scanning electron microscope (FESEM), energy-dispersive analysis (EDX), and X-ray diffraction (XRD). Our findings revealed that the distributions and sizes of the formed alloy nanoparticles, and the hot spots junctions were modified when changing the nanoparticles types. The SERS sensors performance displays an excellent recognition of ultra-low concentrations of chlorpyrifos solutions with an exponential relationship with the Raman signal. The highest enhancement factor (EF = 4.2 × 106) with minimum limit of detection 0.066 mg/Kg were obtained with Au–Pd sensors. |
| Databáze: | OpenAIRE |
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