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Electrochemically functional graphene nanocomposites have been directly prepared by one-step liquid-phase exfoliation of natural flake graphite with methylene blue (MB). UV-visible spectra of the obtained aqueous dispersions of graphene-methylene blue (G-MB) nanocomposite at different exfoliation time indicate that the concentration of graphene dispersion increased markedly with increasing exfoliation time. Atomic force microscopy (AFM) and Raman spectroscopy verified that the graphene was exfoliated into single-layer or bilayer states. FT-IR spectroscopy of G-MB suggests that a π-π stacking interaction is involved in the structure-associated interactions between graphene and adsorbed MB molecules. A G-MB nanocomposite modified glassy carbon (GC) electrode exhibits excellent electrochemical properties and good electrochemical stability. Additionally, the G-MB/GC modified electrode shows more favorable electron transfer kinetics for potassium ferricyanide and potassium ferrocyanide probe molecules, which are important electroactive compounds, compared with reduced graphene oxide (RGO)-MB/GC, RGO/GC, bare GC and graphite/GC electrodes. Furthermore, the G-MB/GC modified electrode exhibits good electrocatalytic activity toward hydrogen peroxide (H2O2) and β-nicotinamide adenine dinucleotide (NADH). The excellent electroactivity, electrochemical stability and electrocatalytic activity of the G-MB nanocomposites prepared in this work are potentially very useful for basic electrochemical studies and for the practical development of electronic devices such as biosensors and photovoltaic cells.


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Preparation, Characterization, and Application of Electrochemically Functional Graphene Nanocomposites by One-Step Liquid-Phase Exfoliation of Natural Flake Graphite with Methylene Blue

Show Author's information Dongdong Zhang1,3,4( )Lei Fu2,3Lei Liao3Nan Liu3Boya Dai3Chengxiao Zhang4( )
School of MedicineXi'an Jiaotong UniversityXi'an710061China
College of Chemistry and Molecular ScienceWuhan UniversityWuhan430072China
Center for Nanochemistry (CNC)Academy for Advanced Interdisciplinary StudiesPeking UniversityBeijing100871China
Key Laboratory of Applied Surface and Colloid ChemistryMinistry of EducationSchool of Chemistry and Chemical EngineeringShanxi Normal UniversityXi'an710062China

Abstract

Electrochemically functional graphene nanocomposites have been directly prepared by one-step liquid-phase exfoliation of natural flake graphite with methylene blue (MB). UV-visible spectra of the obtained aqueous dispersions of graphene-methylene blue (G-MB) nanocomposite at different exfoliation time indicate that the concentration of graphene dispersion increased markedly with increasing exfoliation time. Atomic force microscopy (AFM) and Raman spectroscopy verified that the graphene was exfoliated into single-layer or bilayer states. FT-IR spectroscopy of G-MB suggests that a π-π stacking interaction is involved in the structure-associated interactions between graphene and adsorbed MB molecules. A G-MB nanocomposite modified glassy carbon (GC) electrode exhibits excellent electrochemical properties and good electrochemical stability. Additionally, the G-MB/GC modified electrode shows more favorable electron transfer kinetics for potassium ferricyanide and potassium ferrocyanide probe molecules, which are important electroactive compounds, compared with reduced graphene oxide (RGO)-MB/GC, RGO/GC, bare GC and graphite/GC electrodes. Furthermore, the G-MB/GC modified electrode exhibits good electrocatalytic activity toward hydrogen peroxide (H2O2) and β-nicotinamide adenine dinucleotide (NADH). The excellent electroactivity, electrochemical stability and electrocatalytic activity of the G-MB nanocomposites prepared in this work are potentially very useful for basic electrochemical studies and for the practical development of electronic devices such as biosensors and photovoltaic cells.

Keywords: Graphene, nanocomposite, liquid-phase exfoliation, electrochemistry, methylene blue

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Publication history
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Acknowledgements

Publication history

Received: 13 July 2012
Revised: 12 September 2012
Accepted: 11 October 2012
Published: 10 November 2012
Issue date: December 2012

Copyright

© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2012

Acknowledgements

Acknowledgements

Financial support from the National Science Foundations of China (Nos. 20973006, 21245002 and 21027007) and the National Science Foundation for Post-doctoral Scientists of China (No. 2012M511990) is gratefully acknowledged.

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