Gold nanoparticles decorated on silicate sol-gel matrix embedded manganese ferrite (MnFe2O4)-reduced graphene oxide (rGO) nanocomposites were synthesized through a facile chemical method. The prepared sampleswere characterized by using powder X-ray diffraction (XRD),UV–vis absorption spectroscopy (UV-VIS), energy-dispersive X-ray spectroscopy (EDX), high-resolution transmission electron microscopy (HRTEM) and selected area electron diffraction (SAED) analyses. The Au nanostructures on rGO-MnFe2O4improved the electrocatalytic activity of the rGO-MnFe2O4@Au composite-materials-modified electrodes towards glucose oxidation. Cyclic voltammetry and amperometric methods were used to evaluate the electrocatalytic activity of the rGO-MnFe2O4@Au modified electrodes towards glucose oxidation in 0.1 MNaOH at a less-positive potential (0.2 V) in the absence of any enzyme or redox mediator. The nanocompositemodified electrode (GCE/EDAS/rGO-MnFe2O4@Au) was successfully used for the amperometric sensing ofglucose and the experimental detection limit of 10 μM glucose was observed. The common interfering agents did not interfere with the detection of glucose. The present sensor showed good stability, reproducibility, and selectivity. The nanocomposite-modified electrode was successfully used for the determination of glucose in the urine sample.
Volume 134, 2022
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