Cobalt Ferrite Nanoparticles Decorated on Exfoliated Graphene Oxide, Application for Amperometric Determination of NADH and H2O2, Ali A. Ensaﬁ, Hossein A. Alinajafi, M. Jafari-Asl, B. Rezaei, F. Ghazaei, Material Sci. Eng. C, 2016, 60, 276–284.
Here, cobalt ferrite nanohybrid decorated on exfoliated graphene oxide (CoFe 2 O 4 /EGO) was synthesized. The nanohybrid was characterized by different methods such as X-ray diffraction spectroscopy, scanning electron microscopy, energy dispersive X-ray diffraction microanalysis, transmission electron microscopy, FT-IR, Raman spectroscopy and electrochemical methods. The CoFe 2 O 4 /EGO nanohybrid was used to modify glassy carbon electrode (GCE). The voltammetric investigations showed that CoFe 2 O 4 /EGO nanohybrid has synergetic effect towards the electro-reduction of H 2 O 2 and electro-oxidation of nicotinamide adenine dinucleotide (NADH). Rotating disk chronoamperometry was used for their quantitative analysis. The calibration curves were observed in the range of 0.50 to 100.0 μmol L−1 NADH and 0.9 to 900.0 μmol L−1 H 2 O 2 with detections limit of 0.38 and 0.54 μmol L−1 , respectively. The repeatability, reproducibility and selectivity of the electrochemical sensor foranalysis of the analytes were studied. The new electrochemical sensor was successfully applied for the determination of NADH and H 2 O 2 in real samples with satisfactory results.