Fabrication of multifunctional magnetic FePc@Fe3O4/reduced graphene oxide nanocomposites as biomimetic catalysts for organic peroxide sensing

Multifunctional magnetic nanocomposites, iron (II) phthalocyanine@Fe3O4/reduced graphene oxide (FePc@Fe3O4/rGO), have been fabricated by a facile equilibrium adsorption process with Fe3O4/rGO nanocomposites as adsorbents. Based on their multifunctionality including magnetic and biomimetic catalytic properties, the as-prepared nanocomposites were further immobilized on the magnetic electrode surface by a fast and simple magnetism-assisted assembly for the reduction of tert-butyl hydroperoxide (TBHP). The proposed biomimetic sensor can be applied to the quantification of TBHP with a linear range over the concentration range of 20 μM–60 mM and a detection limit of 7.5 μM (S/N = 3), which offers several advantages including easy preparation, good sensitivity, long-term stability, and low cost.

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► Multifunctional FePc@Fe3O4/rGO was fabricated by a facile equilibrium adsorption.
► The nanocomposites were modified on electrode by a fast magnetism-assisted assembly.
► The immobilized nanocomposites were used as biomimetic catalysts for TBHP reduction.
► This biomimetic sensor offers a wide linear range for TBHP determination.
► The advantages of the sensor include easy preparation, high stability, and low cost.