Facile synthesis of submillimeter sized graphene oxide by a novel method

Xu, Tao; Meng, Qinghan; Shen, Tianze; Cao, Bing

doi:10.1039/c5ra12901j

Cited by 9 publications

(13 citation statements)

References 42 publications

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“…In this paper, for the first time, GO nanosheets were assembled on a highly porous nanofibrous mat directly using the vacuum suction method. For successfully achieving this target, GO nanosheets with large lateral size (>200 μm) were first synthesized using a newly developed method in our group . Then, a thin GO skin layer with 2D nanochannels was obtained using a facile vacuum suction method on a polyacrylonitrile (PAN) nanofibrous support layer.…”

Section: Introductionmentioning

confidence: 99%

Graphene Oxide as an Effective Barrier on a Porous Nanofibrous Membrane for Water Treatment

Wang

Zhang

Liang

et al. 2016

ACS Appl. Mater. Interfaces

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A novel graphene oxide (GO)-based nanofiltration membrane on a highly porous polyacrylonitrile nanofibrous mat (GO@PAN) is prepared for water treatment applications. GO with large lateral size (more than 200 μm) is first synthesized through an improved Hummers method and then assembled on a highly porous nanofibrous mat by vacuum suction method. The prepared GO@PAN membrane is characterized by scanning electron microscopy, transmission electron microscopy, Raman spectrum, X-ray diffraction, and so forth. The results show that graphene oxide can form a barrier on the top of a PAN nanofibrous mat with controllable thickness. The obtained graphene oxide layer exhibits "ideal" pathways (hydrophobic nanochannel) for water molecules between the well-stacked GO nanosheets. Water flux under an extremely low external pressure (1.0 bar) significantly increased due to the unique structure of the GO layer and nanofibrous support. Furthermore, the GO@PAN membrane shows high rejection performance (nearly 100% rejection of Congo red and 56.7% for Na2SO4). A hydrophilic-hydrophobic "gate"-nanochannel model is presented for explaining the water diffusion mechanism through the GO layer. This method for fabrication of the GO membrane on a highly porous support may provide many new opportunities for high performance nanofiltration applications.

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Section: Introductionmentioning

confidence: 99%

Graphene Oxide as an Effective Barrier on a Porous Nanofibrous Membrane for Water Treatment

Wang

Zhang

Liang

et al. 2016

ACS Appl. Mater. Interfaces

Self Cite

336

143

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“…The large interlayer spacing of sGO sheets was attributed to the oxygenated functional groups in sGO. [29,30] The diffraction peaks of MG 5-1 can be assigned to the tetragonal phase of α-MnO 2 (JCPDS 44-0141, a＝9.7845 Å, c＝2.8630 Å), wherein the peaks located at 18.0°, 28.7°, 37.3°, 41.2°, 43.3°, 50.4°, 59.7°, and 65.2° belong to (200), (310), (211), (420), (301), (411), (521), and (002), respectively. [31] The (001) reflection peak of MG 5-1 at 11.6° (0.76 nm) belongs to GO.…”

Section: Resultsmentioning

confidence: 99%

“…The appearance of sharp peaks at 1726, 1621, 1400, 1225, and 1054 cm 1 in GO is attributed to C＝O, COOH, O-H deformation vibration, C-OH, and C-O-C stretching vibrations, respectively. [29,38] By contrast, these peaks disappeared in nMnO 2 -srGO, which indicated decomposition after annealing. [39] Furthermore, the C＝O, O-H deformation vibration, and C-OH peaks vanished in both nMnO 2 -sGO and nMnO 2 -srGO because of the anchoring of nMnO 2 in nMnO 2 -sGO and nMnO 2 -srGO.…”

Section: Resultsmentioning

confidence: 99%

“…sGO was prepared from expanded graphite flakes (60 mesh) that were synthesized by electrochemical intercalation and a modified Hummers method as described previously. [29] Hundreds of micrometers sized GO was synthesized in two steps. First, the expanded graphite flakes with particle size larger than 300 μm were synthesized by electrochemical intercalation.…”

Section: Synthesis Of Sgomentioning

confidence: 99%

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Electrophoretic Deposition of Binder‐Free MnO₂/Graphene Films for Lithium‐Ion Batteries

Meng

Fan

et al. 2017

Chin. J. Chem.

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Binder‐free, nano‐sized needlelike MnO2‐submillimeter‐sized reduced graphene oxide (nMnO2‐srGO) hybrid films with abundant porous structures were fabricated through electrophoretic deposition and subsequent thermal annealing at 500 °C for 2 h. The as‐prepared hybrid films exhibit a unique hierarchical morphology, in which nMnO2 with a diameter of 20—50 nm and a length of 300—500 nm is randomly anchored on both sides of srGO. When evaluated as binder‐free anodes for lithium‐ion half‐cell, the nMnO2‐srGO composites with a content of 76.9 wt% MnO2 deliver a high capacity of approximately 1652.2 mA•h•g−1 at a current density of 0.1 A•g−1 after 200 cycles. The high capacity remains at 616.8 mA•h•g−1 (ca. 65.1% capacity retention) at a current density as high as 4 A•g−1. The excellent electrochemical performance indicates that the nMnO2‐srGO hybrid films could be a promising anode material for lithium ion batteries (LIBs).

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“…The above XPS results mean that substantially oxidized GO had been prepared following the modied Hummer's method. 48…”

Section: Characterization Of Go Structurementioning

confidence: 99%

A novel surface cross-linked GO-based membrane with superior separation performance

et al. 2017

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Facile synthesis of submillimeter sized graphene oxide by a novel method

Abstract: The lateral size of single layer GO that was synthesized by an electrochemically assisted improved Hummers method reached 300 μm.

Cited by 9 publications

References 42 publications

Graphene Oxide as an Effective Barrier on a Porous Nanofibrous Membrane for Water Treatment

Graphene Oxide as an Effective Barrier on a Porous Nanofibrous Membrane for Water Treatment

Electrophoretic Deposition of Binder‐Free MnO₂/Graphene Films for Lithium‐Ion Batteries

A novel surface cross-linked GO-based membrane with superior separation performance

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Facile synthesis of submillimeter sized graphene oxide by a novel method

Abstract: The lateral size of single layer GO that was synthesized by an electrochemically assisted improved Hummers method reached 300 μm.

Cited by 9 publications

References 42 publications

Graphene Oxide as an Effective Barrier on a Porous Nanofibrous Membrane for Water Treatment

Graphene Oxide as an Effective Barrier on a Porous Nanofibrous Membrane for Water Treatment

Electrophoretic Deposition of Binder‐Free MnO2/Graphene Films for Lithium‐Ion Batteries

A novel surface cross-linked GO-based membrane with superior separation performance

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Product

Resources

About

Electrophoretic Deposition of Binder‐Free MnO₂/Graphene Films for Lithium‐Ion Batteries