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Electrochemical reduction and flow detection of iodate on (Bu4N)2Mo6O19 self-assembled monolayer
Li Chen1, Xuefei Tian, Li Tian
1College of Chemistry, Jilin University, Changchun 130012, China.
Abstract:
A stable monolayer of the inorganic-organic hybrid polyoxometalate (Bu4N)2Mo6O19, denoted as Mo6O19, was formed on a sodium-3-mercapto-1-propanesulfonate (MPPS)-covered gold electrode surface, interlaced with an anionic poly(dimethyldiallylammonium chloride) (PDDA) binding layer based on the electrostatic self-assembled (ESA) technique. Electrochemical characterization of the Mo6O19 self-assembled thin films on the solid surface by cyclic voltammetry and AC impedance spectroscopy revealed a stable and sensitive electrocatalytic response to the reduction of iodate. Iodate was determined amperometrically through a flow injection cell at the modified electrode in the concentration range of 1.0 x 10(-6) to 1.0 x 10(-1) M with a detection limit of 8 x 10(-8) M (signal-to-noise ratio = 3). Performance was improved to meet practical needs compared with previously reported analogues.
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