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01-08-2012 | Research Paper | Issue 8/2012

Journal of Nanoparticle Research 8/2012

Controlled synthesis of graphene sheets with tunable sizes by hydrothermal cutting

Journal:
Journal of Nanoparticle Research > Issue 8/2012
Authors:
Chen Ma, Zhongxin Chen, Ming Fang, Hongbin Lu
Important notes

Electronic supplementary material

The online version of this article (doi:10.​1007/​s11051-012-0996-0) contains supplementary material, which is available to authorized users.
Chen Ma and Zhongxin Chen contributed equally to this study.

Abstract

We report a hydrothermal method that directly reduces graphene oxide (GO) into graphene nanosheets (GNs) with different sizes. In the presence of NaOH and hydrazine, the hydrothermal reaction at 80 °C resulted in the formation of GNs with a lateral size of ~1 μm but the size of GNs decreased to ~300 and ~100 nm upon increasing the reaction temperature to 150 and 200 °C, respectively. The morphology of the resulting GNs was observed by atomic force microscopy and transmission electron microscopy. The thickness of GNs is basically <3 nm, indicates the GNs stack together in a few-layer manner. XRD, XPS, FTIR, and Raman spectroscopy were used to characterize the structural changes before and after reduction. The results suggested that the defect stability in GO and reduced GNs could be responsible for the temperature dependence of the size of reduced GNs.

Graphical Abstract

A hydrothermal method is proposed to simultaneously reduce and cut graphene oxide into graphene sheets with different sizes in a controlled manner, in which the reaction temperature as a critical parameter is used to control the size of resulting graphene sheets.

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