Synthesis of nanocomposite based on molecularly imprinted polymer electrode modified by gold nanoparticles and graphene oxide to prepare the diazinon-sensitive electrochemical sensor

Document Type : Original Article

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Department of Chemistry, Tabriz Branch, Islamic Azad University, Tabriz, Iran

Abstract

Nowadays, owing to the increasing application of pesticides and their negative effects on human and other creatures accurate analytical methods are necessary. The aim of this work was a modification of glassy carbon electrode composition based on imprinted polymer and applying it as a sensor for the determination of Diazinon (DZN) in real and experimental samples. A novel composite of magnetic graphene oxide, gold nanoparticles, molecular imprinted polymers (MGO@AuNPs-MIPs) was synthesized and applied as a DZN electrochemical sensor. After synthesis of graphene and MGO@AuNPs, the template molecule (DZN) was first adsorbed at the surface of MGO@AuNPs, then the total composition was synthesized by polymerization of methyl methacrylate, ethylene glycol dimethyl acrylate and azodiisobutyronitrile as the functional monomer, the cross-linking agent and initiator of the imprinting polymerization, respectively. Then, the obtained composite was washed to remove the DZN. In order to identify synthesized compounds, XRD, FT-IR, and SEM techniques have been used. Square wave voltammetry was used for electrochemical measurements. The lowest detectable concentration (LOD) and the lowest quantitative concentration (LOQ) of MGO@AuNPs-MIPs were 8.72 х 10-9 and 2.63 х 10-8 molL-1, respectively.

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