Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7920501 | Journal of Physics and Chemistry of Solids | 2018 | 12 Pages |
Abstract
In this work, we report on a dual-behavior electrochemical/optical sensor for sensitive determination of Imidacloprid by fluorescent dye (fluorescein, FL) and imprinted polymer modified europium doped superparamagnetic iron oxide nanoparticles (FL@SPIONs@MIP). The imidacloprid (IMD)-imprinted polymer was directly synthesized on the Eu-SPIONs surface via Activators regenerated by the electron transfer-atom transfer radical polymerization (ARGET-ATRP) technique. Preparation, characterization and application of the prepared FL@SPIONs@MIP were systematically investigated using scanning electron microscopy (SEM), X-ray diffraction (XRD), vibrating sample magnetometer (VSM), fluorescence spectroscopy and electrochemical techniques. The electrochemical experiments exhibited a remarkable selectivity of the prepared sensor towards IMD. Determination of IMD by the square wave stripping voltammetry method represented a wide linear range of 0.059-0.791â¯Î¼gâ¯Lâ1 with a detection limit of 0.0125â¯Î¼gâ¯Lâ1. In addition, the fluorescence method shows a linear range of 0.039-0.942â¯Î¼gâ¯Lâ1 and LOD of 0.0108â¯Î¼gâ¯Lâ1. The fluorescence property of prepared FL@SPIONs@MIP was used for rapid, on-spot but selective detection of IMD in real samples. The proposed electrode displayed excellent repeatability and long-term stability and was successfully applied for quantitative and trace level determination of IMD in several real samples.
Related Topics
Physical Sciences and Engineering
Materials Science
Electronic, Optical and Magnetic Materials
Authors
Sunil Kumar, Paramita Karfa, Rashmi Madhuri, Prashant K. Sharma,