An environment-friendly preparation of reduced graphene oxide nanosheets via amino acid
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Abstract:
Chemically modified graphene has been studied in many applications due to its excellent electrical, mechanical, and thermal properties. Among the chemically modified graphenes, reduced graphene oxide is the most important for its structure and properties, which are similar to pristine graphene. Here, we introduce an environment-friendly approach for preparation of reduced graphene oxide nanosheets through the reduction of graphene oxide that employs L-cysteine as the reductant under mild reaction conditions. The conductivity of the reduced graphene oxide nanosheets produced in this way increases by about 106 times in comparison to that of graphene oxide. This is the first report about using amino acids as a reductant for the preparation of reduced graphene oxide nanosheets, and this procedure offers an alternative route to large-scale production of reduced graphene oxide nanosheets for applications that require such material.Keywords:
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In this work, the process of synthesis of graphene oxide was carried using modified Hummer's method. Synthesizing graphene oxide was obtained by threating pure graphite using KMnO4 and H2SO4 as the oxidizing agent and sonicating the solution to separate the layers of the graphite. The result of the graphene oxide then reduced to reduce graphene oxide using Aluminum powder (Al). The process of synthesizing graphene oxide was controlled by reaction/stirring time duration at constant temperature 40 °C. Graphite oxide, graphene oxide and reduce graphene oxide were characterize using Scanning Electron Microscope, UV-Visible spectra, X-ray Diffraction, and FT-IR spectroscopy analysis. The result shows that the 7 hours reaction/stirring time duration has better degree of oxidation. The simple approach is designed to produce large scale production of graphene oxide and reduce graphene oxide.
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Graphene oxide was synthesized from graphite flakes using modified Hummers' method. The interlayer spacings of graphite, graphite oxide and graphene oxide were measured using X-ray diffraction technique. The C/O atomic ratios of graphite oxide and graphene oxide were calculated from XPS measurements. The transformation of graphite to graphite oxide and finally to graphene oxide was clearly observed from the micro-Raman spectroscopy data and was confirmed from the FESEM micrographs. UV-VIS-NIR spectrophotometer was used to study the absorbance of graphene oxide and reduced graphene oxide samples. Finally, the chemically reduced graphene oxide was heat-treated in air to obtain chemically modified graphene.
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A new method to separate graphite oxide (GO) modified by polyethylene oxide (PEO) by the aid of ultrasonic radiation was developed. Modified GO (graphene oxide or single layer of graphite oxide) did not show not appear crystalline peak (d002) on the X-Ray and took the form of a single layer graphene oxide on the image AFM and TEM. The exfoliated graphene oxide was reduced (RGO) to graphene by the reducing agent system HI – Acetic acid (HI-AcOH). The sheet resistance of RGOHI-AcOH is about 120 Ω/sq in the form graphene paper. In addition, FTIR, UV-Vis and Raman spectra showed more clearly about characteristics of graphite oxide, graphene oxide and RGOHI-AcOH.
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Abstract In this article, we report on carbonaceous impurities that residing in graphene oxide prepared from the chemical exfoliation of graphite significantly impact on the electrochemical capacitive qualities of graphene oxide and in situ electrochemically reduced graphene oxide as well. The results demonstrate that the carbonaceous impurities cause totally opposite effects on the electrochemical capacitive properties of graphene oxide and electrochemically reduced graphene oxide. After removal of the impurities, the specific capacitance of graphene oxide is greatly improved while the value for electrochemically reduced graphene is diminished. This finding is particularly favorable to reveal the inherent electrochemical capacitive qualities of graphene and contributes to further exploration of graphene as an electrode material in supercapacitiors.
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Abstract Graphene oxide and reduced graphene oxide attract a lot of attention due to graphene provides some properties that suitable for wider application. Properties of graphene are unique since it can be tuned regarding to its controlled synthesis method and several treatments. This work, graphene oxide was synthesized from used graphite electrode by modified Hummer’s method in which oxidation process controlled. Zinc was used to produce reduced graphene oxide. Graphene oxide and reduced graphene oxide were characterized by SEM, EDS, FT-IR, UV-vis, and XRD. Effective strategy was studied to produce graphene oxide and reduced graphene oxide by controlling its oxidation process. These results prove that chemical and structural properties of graphene oxide and reduced graphene oxide depend on oxidation duration. Furthermore, carbon/oxygen ratio was studied to evaluate effective oxidation process.
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Abstract: Graphite oxide is of great importance in preparing graphene, the average layer of graphene depends on that of graphene oxide in some extent. In this paper, we prepared graphite oxide via H 3 PO 4 /H 2 SO 4 mixed acid, then which were dried by vacuum drying in a freezer dryer and drying oven respectively, the graphite oxide powder and thin film were obtained correspondingly. After dispersing the above two forms of graphite oxide in water by shaking, stirring or supersonic wave, they were reduced in the same condition. According to the XRD, AFM results, vacuum freeze-drying was inclined to gain few-lay graphene.
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