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Abstract: In this work, a novel electrochemical molecularly imprinted polymer (MIP) sensor for fluxapyroxad (FP) was constructed. This MIP sensor was based on indole-6-carboxylic acid (6-IAA) and platinum (Pt) nanoparticles (NPs) supported amino-functionalized graphene (NH2-r-GO). Massive and ultrasmall Pt NPs (2-3 nm) were supported on NH2-r-GO, which was easily prepared using a simple, aqueous phase method. Pt NP was firstly generated using ascorbic acid as the reducant and hexadecylpyridinium chloride as the structure-directing agent; then, NPs were immediately loaded on the surface of the coexisting NH2-r-GO. Loading allowed for the interreaction between the amino group and Pt to form the hybrid nanocomposite. This hybrid material was then used to modify a glassy carbon electrode (GCE) surface, resulting in a Pt-NPs-NH2-r-GO / GCE. After this modification, FP was imprinted on the aforementioned electrode surface using cyclic voltammetry, with 6-IAA as the functional monomer. Finally, FP was eluted from the polymer, resulting in the MIP sensor. After rebinding the template molecules Fe(CN)63-/4- was used to measure the impedance of the MIP sensor. Results indicated an excellent response for FP across a linear range of 1.0 × 10-9 to 1.3 × 10-5 mol L-1; the detection limit was determined to be 1.0 × 10-10 mol L-1 (S/N= 3). This sensor was also used to detect FP in real samples, with results indicating it was a reliable sensor for FP
Template and target information: fluxapyroxad, FP
Author keywords: Electrochemical sensor, Fluxapyroxad, molecularly imprinted polymer, Indole-6-carboxylic acid, Pt nanoparticles, Amino group functionalized-graphene