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 10 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

343

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 10 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 10 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