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    Effect of different copper salts on the electrochemical determination of Cu (II) by the application of the graphene oxide-modified glassy carbon electrode
    (ELSEVIER, 2017) Incebay, Hilal; Yazicigil, Zafer
    In this study, graphene oxide and reduced graphene oxide nanoparticles were synthesized by Hummers method and characterized Fourier transform infrared spectroscopy, X-ray diffraction spectroscopy, scanning electron microscopy and thermogravimetric analysis. Then, glassy carbon electrode surfaces were modified with synthesized and characterized graphene oxide (GO) and reduced graphene oxide (red-GO) using physical immobilization. Bare and modified surfaces were characterized by cyclic voltammetry, electrochemical impedance spectroscopy and scanning electron microscopy. Application of graphene oxide (GO/GC) and reduced graphene oxide-modified glassy carbon (red-GO/GC) surfaces for the electrochemical determination of copper(II) using different copper salts such as CuSO4 center dot 5H(2)O, Cu(NO3)(2)center dot 3H(2)O and CuCI2 were performed by differential pulse voltammetry. The GO/GC surface was found to be suitable for selective determination of Cu(II) in the solutions containing the mixture of heavy metal ions (Zn(II), Pb(II), Cd(II), Fe(III) and Mn(II)) and showed high stability and reproducibility. The GO/GC surface was treated with CuSO4 center dot 5H(2)O, Cu(NO3)(2)center dot 3H(2)O and CuCI2 salts solution in optimum conditions and afterward SEM images were measured 10 mu m in size and radius of these ions in Cu (II)/GO/GC surfaces. Thus the determination of copper ions on the GO/GC surface was made for the first time by comparing the effect of the types of copper salts. When it was evaluated in terms of inorganic theory, the results were found to be in harmony.
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    Investigation to Sensitive Determination of Glucose Using a Hybrid System Based on Graphene and Nickel Nanoparticles
    (IEEE, 2017) Incebay, Hilal; Bilici, Esra; Yazicigil, Zafer
    Nanoparticles has attracted great attention to many applications due to their extraordinary physical and chemical, mechanical, magnetic, optical, electrical and piezoelectric properties compared to bulk materials, which offer great promise in the development of nanotechnology to revolutionise the world through promising applications, including industry, agriculture, medicine, public health, and environment. On the other hand graphene has received much attention in the last years as a nanomaterial with many potential applications. In this study, solution of reduced graphene oxide, Ni metal nanoparticles were modified on the glassy carbon electrode surface and then graphene and metal nanaoparticle were formed hybrid systems. The modified electrode surfaces prepared in this way were characterized by electrochemically. The obtained results were compared with the results of bare GC. The prepared electrode surfaces were evaluated electrochemical response against different concentrations of glucose for the non-enzymatic and enzymatic glucose sensors application area.