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Highly sensitive and selective detection of dopamine in the presence of ascorbic acid at graphene oxide modified electrode
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TLDR
In this article, a graphene oxide (GO) modified glassy carbon electrode (GCE) was prepared by covalent coupling method, which was characterized by atomic force microscope (AFM), cyclic voltammetry (CV) and electrochemical impedance spectra (EIS), and the results showed that the electrochemistry of dopamine (DA) is greatly enhanced, while that of ascorbic acid (AA) is totally impressed.Abstract:
A graphene oxide (GO) modified glassy carbon electrode (GCE), namely GO/GCE was prepared by covalent coupling method, which was characterized by atomic force microscope (AFM), cyclic voltammetry (CV) and electrochemical impedance spectra (EIS). On this modified electrode, it is found that the electrochemistry of dopamine (DA) is greatly enhanced, while that of ascorbic acid (AA) is totally impressed, showing that the modified layer of GO has completely different impact on the electrochemical response of DA and AA. The probable mechanism to cause the different impact was proposed. GO/GCE was further applied as a biosensor for the determination of DA in the presence of with AA, and the results showed that the coexisted AA has no interference toward the electrochemistry of DA. The oxidation peak currents of DA present a good linear relationship with the concentrations in the range from 1.0 μM to 15.0 μM with a detection limit of 0.27 μM. The electrochemical parameters such as the electron transfer rate constant, catalytic rate constant, diffusion coefficient, and electron/proton transfer number of DA on GO/GCE were also studied.read more
Citations
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A review on graphene-based nanocomposites for electrochemical and fluorescent biosensors
TL;DR: Graphene and its oxygenated derivatives, including reduced graphene oxide (rGO), are becoming an important class of nanomaterials in the field of biosensors as discussed by the authors, and the discovery of graphene has spectacularly accelerated research on fabricating low-cost electrode materials because of its unique physical properties, including high specific surface area, high carrier mobility, high electrical conductivity, flexibility.
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Graphene and its sensor-based applications: A review
TL;DR: An overview of the work done on graphene in recent years is presented in this article, which explains the preparation techniques, the properties of graphene related to its physio-chemical structure and some key applications.
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Engineered Carbon-Nanomaterial-Based Electrochemical Sensors for Biomolecules
TL;DR: This review article gives a brief overview of voltammetric techniques and how these techniques are applied in biosensing, as well as the details surrounding important biosensing concepts of sensitivity and limits of detection.
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Functional Nanomaterials and Nanostructures Enhancing Electrochemical Biosensors and Lab-on-a-Chip Performances: Recent Progress, Applications, and Future Perspective.
TL;DR: This review answers many questions around the nanomaterials used, their inherent properties and the chemistries they offer that are of interest to the analytical systems, and their roles in analytical applications in the past 5 years (2013-2018), and it gives a quantitative assessment of their positive effects on the analyses.
Journal ArticleDOI
A facile electrochemical sensor based on reduced graphene oxide and Au nanoplates modified glassy carbon electrode for simultaneous detection of ascorbic acid, dopamine and uric acid
TL;DR: A facile Au nanoplates and reduced graphene oxide (RGO) modified glassy carbon electrode (GCE) was fabricated via a simple electrochemical method, denoted as Au/RGO/GCE.
References
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Book
Electrochemical Methods: Fundamentals and Applications
Allen J. Bard,Larry R. Faulkner +1 more
TL;DR: In this paper, the authors present a comprehensive overview of electrode processes and their application in the field of chemical simulation, including potential sweep and potential sweep methods, coupled homogeneous chemical reactions, double-layer structure and adsorption.
Journal ArticleDOI
Processable aqueous dispersions of graphene nanosheets
TL;DR: It is reported that chemically converted graphene sheets obtained from graphite can readily form stable aqueous colloids through electrostatic stabilization, making it possible to process graphene materials using low-cost solution processing techniques, opening up enormous opportunities to use this unique carbon nanostructure for many technological applications.
Journal ArticleDOI
General expression of the linear potential sweep voltammogram in the case of diffusionless electrochemical systems
TL;DR: In this article, the equation of the linear potential sweep voltammogram is derived for any degree of reversibility of the electrochemical reaction for the following methods: surface voltammetry when both the oxidized and the reduced forms are strongly adsorbed, and a Langmuir isotherm is obeyed, thin layer voltamometry, and linear potential sweeping coulometry.
Journal ArticleDOI
Synthesis of water soluble graphene.
Yongchao Si,Edward T. Samulski +1 more
TL;DR: A facile and scalable preparation of aqueous solutions of isolated, sparingly sulfonated graphene is reported, and NMR and FTIR spectra indicate that the bulk of the oxygen-containing functional groups was removed from graphene oxide.