Preparation Hydrophobic Graphene Aqueous Dispersion and Electrochemical Properties

doi:10.7517/j.issn.1674-0475.2012.04.280

Abstract

Abstract: The direct dispersion of hydrophobic graphene sheets in water without the assistant of surfactant stabilizers has recently been recognized as an important task for production of individual graphene sheets. We developed a facial method to disperse hydrophobic graphene sheets in aqueous medium through enlarging the amount of hydrazine-hydrate in the absence of surfactant or any other foreign electrostatic stabilization agents. Homogeneous aqueous graphene dispersion had produced lower zeta potential of more negative than -32.5 mV at solution pH of 5.89 and was stable for six months without any precipitate. The folded individual single-layer graphene sheets with 0.38 nm layer thick and the formation of a hexagonal crystalline graphene structure were observed from AFM and TEM images, respectively. XPS analysis showed the efficient reduction of graphene oxide. As-prepared graphene-glassy carbon electrode (GE-GCE) showed a relatively sensitive electrochemical response toward the detection of AA and UA than glassy carbon electrode (GCE).

Key words: graphene, dispersion, hydrazine-hydrate, electrochemical response

CLC Number:

KIM Song-hun, LI Dan-dan, LI Jiu-ming, YU Yuan, LI Yu-zhen, ZHI Jin-fang. Preparation Hydrophobic Graphene Aqueous Dispersion and Electrochemical Properties[J]. Imaging Science and Photochemistry, 2012, 30(4): 280-288.

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