Hydrogen peroxide electrochemical sensor based on Fe3O4 nanoparticles

Fe₃O₄ nanoparticles have been successfully synthesised through co-precipitation of FeSO₄ and FeCl₃ by adding a solution of NH₄OH. The products are characterised in detail by multiform techniques: scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray analysis and X-ray diffraction. The results show that the phase structure of the Fe₃O₄ nanoparticles is a spinel structure of pure Fe₃O₄ with the particle size ranging from 40 to 50 nm. The obtained Fe₃O₄ nanoparticles have been employed as electrode materials for electrochemical sensing H₂O₂. The detection sensitivity of the sensor was 0.77683 μA mM^-1 and the detection limit was estimated to be about 1 mM.