Probing the Electrochemical Properties of Gold Electrode Modified with Edge-Functionalized Graphene and its Application

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Aghajani, Talin | 2012

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 43434 (03)
University: Sharif University of Technology
Department: Chemistry
Advisor(s): Shahrokhian, Saeed
Abstract:
In the present work, edge-functionalaized graphene was used as electrode material and its electrochemical properties were systematically characterized by electrochemical impedance spectroscopy and cyclic voltammetry. Two methods were applied to modify the gold electrode surface. First method was the self assembling process of graphene nanosheets on gold electrode surface. Second method was simply casting specific amounts of graphene suspension on the gold electrode surface. Nyquist plots show decrease of the charge transfer resistance on the electrode surface at both cases. In cyclic voltammetry studies, first electrode shows no significant changes while the second electrode exhibits improved responses compared to that of bare Au electrode. Moreover, the second electrode shows a superior biosensing performance than bare electrodes toward dopamine detection in the presence of common interfering agents such as ascorbic acid and uric acid. Finally, as an example of real sample analysis, the application of the modified electrode for quantification of methyl-dopa in pharmaceutical products is investigated.
Keywords:
Biosensor ; Cyclic Voltammetry ; Modified Electrodes ; Electrochemical Impedance Spectroscopy ; Edges Functionalized Graphene

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