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Tajabadi, M.T.,Sookhakian, M.,Zalnezhad, E.,Yoon, G.H.,Hamouda, A.M.S.,Azarang, M.,Basirun, W.J.,Alias, Y. New York] ; North-Holland 2016 APPLIED SURFACE SCIENCE - Vol.386 No.-
An efficient non-enzymatic biosensor electrode consisting of nitrogen-doped graphene (N-graphene) and platinum nanoflower (Pt NF) with different N-graphene loadings were fabricated on indium tin oxide (ITO) glass using a simple layer-by-layer electrophoretic and electrochemical sequential deposition approach. N-graphene was synthesized by annealing graphene oxide with urea at 900<SUP>o</SUP>C. The structure and morphology of the as-fabricated non-enzymatic biosensor electrodes were determined using X-ray diffraction, field emission electron microscopy, transmission electron microscopy, Raman and X-ray photoelectron spectra. The as-fabricated Pt NF-N-graphene-modified ITO electrodes with different N-graphene loadings were utilized as a non-enzymatic biosensor electrode for the detection of hydrogen peroxide (H<SUB>2</SUB>O<SUB>2</SUB>). The behaviors of the hybrid electrodes towards H<SUB>2</SUB>O<SUB>2</SUB> reduction were assessed using chronoamperometry, cyclic voltammetry and electrochemical impedance spectroscopy analysis. The Pt NF-N-graphene-modified ITO electrode with a 0.05mgml<SUP>-1</SUP> N-graphene loading exhibited the lowest detection limit, fastest amperometric sensing, a wide linear response range, excellent stability and reproducibility for the non-enzymatic H<SUB>2</SUB>O<SUB>2</SUB> detection, due to the synergistic effect between the electrocatalytic activity of the Pt NF and the high conductivity and large surface area of N-graphene.