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Liquid-phase and solid-phase microwave irradiations for reduction of graphite oxide |
Zhao Na (赵娜)a, Wen Chen-Yu (文宸宇)a, Zhang David Wei (张卫)a, Wu Dong-Ping (吴东平)a, Zhang Zhi-Bin (张志滨)b, Zhang Shi-Li (张世理)b |
a State Key Laboratory of ASIC and System, Fudan University, Shanghai 200433, China; b Solid-State Electronics, The Ångström Laboratory, Uppsala University, P. O. Box 534, 75121 Uppsala, Sweden |
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Abstract In this paper, two microwave irradiation methods: (i) liquid-phase microwave irradiation (MWI) reduction of graphite oxide suspension dissolved in de-ionized water and N, N-dimethylformamide, respectively, and (ii) solid-phase MWI reduction of graphite oxide powder have been successfully carried out to reduce graphite oxide. The reduced graphene oxide products are thoroughly characterized by scanning electron microscopy, atomic force microscopy, X-ray photoelectron spectroscopy, Fourier transform infrared spectral analysis, Raman spectroscopy, UV-Vis absorption spectral analysis, and four-point probe conductivity measurements. The results show that both methods can efficiently remove the oxygen-containing functional groups attached to the graphite layers, though the solid-phase MWI reduction method can obtain far more efficiently a higher quality-reduced graphene oxide with fewer defects. The I(D)/I(G) ratio of the solid-phase MWI sample is as low as 0.46, which is only half of that of the liquid-phase MWI samples. The electrical conductivity of the reduced graphene oxide by the solid method reaches 747.9 S/m, which is about 25 times higher than that made by the liquid-phase method.
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Received: 24 February 2014
Revised: 21 June 2014
Accepted manuscript online:
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PACS:
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81.05.-t
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(Specific materials: fabrication, treatment, testing, and analysis)
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81.05.U-
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(Carbon/carbon-based materials)
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81.05.ue
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(Graphene)
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Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61176090) and the National Science and Technology Project 02, China (Grant No. 2013ZX02303-004). |
Corresponding Authors:
Wu Dong-Ping
E-mail: dongpingwu@fudan.edu.cn
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Cite this article:
Zhao Na (赵娜), Wen Chen-Yu (文宸宇), Zhang David Wei (张卫), Wu Dong-Ping (吴东平), Zhang Zhi-Bin (张志滨), Zhang Shi-Li (张世理) Liquid-phase and solid-phase microwave irradiations for reduction of graphite oxide 2014 Chin. Phys. B 23 128101
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