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期刊名称: Nanotechnology
Volume:22    Issue:5        Page:055705-055705
ISSN:0957-4484

Temperature dependence of graphene oxide reduced by hydrazine hydrate期刊论文

作者: Ren Peng-Gang Yan Ding-Xiang Ji Xu Chen Tao Li Zhong-Ming
DOI:10.1088/0957-4484/22/5/055705

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页码: 055705-055705
被引频次: 337
出版者: IOP Publishing,IOP PUBLISHING LTD
期刊名称: Nanotechnology
ISSN: 0957-4484
卷期: Volume:22    Issue:5
语言: English
摘要: Graphene oxide (GO) was successfully prepared by a modified Hummer's method. The reduction effect and mechanism of the as-prepared GO reduced with hydrazine hydrate at different temperatures and time were characterized by x-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), elemental analysis (EA), x-ray diffractions (XRD), Raman spectroscopy and thermo-gravimetric analysis (TGA). The results showed that the reduction effect of GO mainly depended on treatment temperature instead of treatment time. Desirable reduction of GO can only be obtained at high treatment temperature. Reduced at 95 degrees C for 3 h, the C/O atomic ratio of GO increased from 3.1 to 15.1, which was impossible to obtain at low temperatures, such as 80, 60 or 15 degrees C, even for longer reduction time. XPS, 13C NMR and FTIR results show that most of the epoxide groups bonded to graphite during the oxidation were removed from GO and form the sp(2) structure after being reduced by hydrazine hydrate at high temperature (>60 degrees C), leading to the electric conductivity of GO increasing from 1.5 x 10 (6) to 5 S cm(-1), while the hydroxyls on the surface of GO were not removed by hydrazine hydrate even at high temperature. Additionally, the FTIR, XRD and Raman spectrum indicate that the GO reduced by hydrazine hydrate can not be entirely restored to the pristine graphite structures. XPS and FTIR data also suggest that carbonyl and carboxyl groups can be reduced by hydrazine hydrate and possibly form hydrazone, but not a C=C structure.
相关主题: DISPERSIONS, PHYSICS, APPLIED, FILMS, REDUCTION, ORGANIC-SOLVENTS, MATERIALS SCIENCE, MULTIDISCIPLINARY, NANOSHEETS, NANOSCIENCE & NANOTECHNOLOGY, GRAPHITE OXIDE, COMPOSITES, LAYER, SHEETS,

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