Metal-Organic Framework Wears a Protective Cover for Improved Stability
Tao ZhangBinghua ZouMeng ShaoXinyi ChenWeina ZhangLinjie LiQinjie DuHongfeng LiYu Lin HuJiena WengWei‐Wei XiongBing ZhengWeina ZhangFengwei Huo
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Metal-organic frameworks (MOFs) with an ordered channel and porosity show great promise for a myriad of purposes. Unfortunately, the coordination bond of metal ions and organic ligands easily weakens in unfavorable environments, which poses a key problem in expanding the application of MOFs. Herein, we report a general and efficient strategy to enhance the stability and preserve the porosity of MOFs by coating them with reduced graphene oxide (rGO). The prepared hybrid material consisted of MOFs and rGO, as the core and the protective shell, respectively. It is worth noting that the obtained MOFs@rGO composite material maintained a well-defined crystal structure and showed good catalytic activity as well as enhanced stability. Notably, this novel and general method of coating MOFs with a thin protective rGO shell will broaden the application fields of MOFs and open up a new avenue for the research of MOFs.Graphene have attracted wide attention for its unique characteristics(e.g.electronic,thermal,mechanical etc.).Graphene oxide not only possesses the intrinsic properties of graphene but also contains many oxygen-containing functional groups such as hydroxyl,epoxy,carboxyl and carbonyl groups.Those oxygen-containing functional groups may improve the adsorbability of graphene oxide to gases which is advantageous for its gas sensing properties.In this investigation,graphene oxide was synthesized by a modified Hummer's method.The gas sensing properties of the as-prepared graphene oxide to NH3was then investigated.The results indicate that graphene oxide exhibited excellent sensitivities to NH3 with a well linearly relationship ranging from 1.5×10-4 to 3.5×10-4.
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A facile method for the synthesis of highly fluorinated reduced graphene oxide from graphene oxide using BF3-OEt2 solution and alkylthiol/alkylamine on the Gram scale has been described using a detailed mechanism. The maximum fluorination was as high as 38 wt% and the fluorinated reduced graphene oxide produced has great wettability and high insulating properties.
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Grafen türevleri (grafen oksit-GO, indirgenmiş grafen oksit-RGO, çok tabakalı grafen-MLG vb.) polimer malzemelerin özelliklerini iyileştirmek için yüksek potansiyele
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First, the florescence emission mechanism of graphene oxide will be discussed. Second, fluorescence of graphene oxide can be tuned by tailoring functional groups. Third, graphene oxide-based sensors can be designed with graphene oxide either as an energy donor or as an energy acceptor. Fourth, graphene oxide-based sensors have been sued to detect heavy metal and biomarkers.
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Summary form only given. A variety of photonic device functionalities has now been demonstrated using both graphene and more-or-less reduced versions of the closely related compound material, graphene oxide (GO). Graphene oxide can readily be produced with a range of degrees of oxidation - and it is then generically called reduced graphene oxide (rGO). It is also important, from various points-of-view, that rGO typically incorporates a significant amount of water (H 2 O). Oxygen and hydrogen atoms that are bonded onto a single sheet of graphene form branches that may be labelled chemically as carboxyl, carbonyl and hydroxyl bonds, inter alia.The functions that have been demonstrated in photonic device structures that incorporate graphene and rGO include electrooptic and all-optical modulation, photo-detection, polarization selection and light emission. These demonstrations of different device functionalities also provide indications of potentially superior performance that arise from the special properties of both graphene and rGO. Other 2D-lattice materials, e.g., molybdenum suphide and molybdenum selenide, have also been identified and offer further possibilities for device functionality. Several different planar deposition technologies have now been established and lithographic patterning processes have also been demonstrated. Processes for local modification of the 2D material properties, on various size-scales, are also possible. For use as an ingredient in photonic integration, the graphene/rGO may be deposited directly onto a suitably prepared substrate or deposited, e.g., on a thin foil of a metal such as copper - and then transferred onto another substrate. The availability of convenient deposition techniques means that graphene and GO are both of interest for planar photonic integration technology. The `substrate' to be exploited in the photonic integrated circuit (PIC) can be practically any waveguide-based integration system, e.g., silicon-on-insulator, oxide or chalcogenide type glasses, epitaxial III-V semiconductors or polymeric materials. This invited presentation will provide a targeted review of research relevant to the exploitation of graphene or GO in photonic integration. Recent and new results from our own research, which has been particularly concerned with applications of multi-layer GO, will be featured.
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This letter reports the one-pot synthesis of reduced graphene oxide/Fe3O4 composites. By the electrostatic interaction of exfoliated graphene oxide and Fe3+ ions, graphene oxide/Fe3+ ions were prepared in a diethylene glycol. In situ formation of Fe3O4 nanoparticles on graphene oxide sheets and reduction of graphene oxide were then achieved simultaneously by the thermal decomposition reaction of Fe(acac)3 at high temperature. This synthetic method enables control over the phase of Fe3O4 nanoparticles on graphene sheets, further preventing restacking of the graphene sheets and aggregation of Fe3O4 nanoparticles. By controlling the mass ratio of Fe(acac)3 and graphene oxide, a series of reduced graphene oxide/Fe3O4 composites were prepared. Magnetic properties of the reduced graphene oxide/Fe3O4 composites are investigated.
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Carbon fibers
Graphene foam
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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.
Environmentally Friendly
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The local atomic structure of graphene oxide (GO) and reduced annealed graphene oxide (raGO) is determined via ultra-high-resolution transmission electron microscopy. We find that the proposed and desired return to graphene from GO is not possible through the synthetic route employed. The detailed structure of GO, previously unknown, is revealed as mottled, with few square nanometer graphitic regions separated by highly oxidized regions.
Nanometre
Graphite oxide
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Micrometric foils of graphene oxide are prepared in the laboratory starting from water dispersed solution of graphene oxide at low concentration. Measurements on five physical properties have been performed in the foils of graphene oxide and reduced graphene oxide. The reduction is obtained thermally, using IR and UV laser irradiations and MeV helium ion beam irradiations at different fluence. The parameters such as the atomic composition, the mass density, the surface roughness, the wetting ability, and the electrical conductivity are investigated. This last parameter assumes different values for the pristine graphene oxide foils and for the reduced ones. Comparison of experimental measurements with the literature data and the results and discussion are presented.
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