An amplified electrochemical sensor employing one-step synthesized nickel-copper-zinc ferrite/carboxymethyl cellulose/graphene oxide nanosheets composite for sensitive analysis of omeprazole.

49,50 As mentioned in above, the utilization of magnetic nanoparticles as electrode surface modifiers has an increasing trend due to the high charge transfer capacity that significantly increases the electron transfer between the analyte and the electrode and consequently improves the sensitivity of electrochemical sensors. 51–55 Despite these advantages, the accumulation of graphene oxide and magnetic nanostructures reduces their efficiency. 56–58 Therefore, to solve this problem, these materials must be dispersed in a porous substrate.

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