In Situ Synthesis of Thermochemically Reduced Graphene Oxide Conducting Nanocomposites

Park, Ok-Kyung; Hahm, Myung Gwan; Lee, Sungho; Joh, Han‐Ik; Na, Seok‐In; Vajtai, Róbert; Lee, Joong Hee; Ku, Bon‐Cheol; Ajayan, Pulickel M.

doi:10.1021/nl203803d

Cited by 109 publications

(83 citation statements)

References 29 publications

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“…The Raman spectrum of APGO displays two strong peaks at 1580 and at 1350 cm -1 , corresponding to the D and G-bands, respectively. The G-band is attributed to the first order scattering of the E 2g phonon of the sp 2 carbon-carbon bond; while the D-band represents the defect sites associated with vacancies and grain boundaries [19,20]. For the diazonium-salt reaction, the sp 2 of a carbon bond is converted to the sp 3 -hybridized carbon atom.…”

Section: Preparation Of Apgomentioning

confidence: 99%

Layer-by-layer assembled graphene oxide films and barrier properties of thermally reduced graphene oxide membranes

Kim¹,

Park²,

Lee³

et al. 2013

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114

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In this study, we present a facile method of fabricating graphene oxide (GO) films on the surface of polyimide (PI) via layer-by-layer (LBL) assembly of charged GO. The positively charged amino-phenyl functionalized GO (APGO) is alternatively complexed with the negatively charged GO through an electrostatic LBL assembly process. Furthermore, we investigated the water vapor transmission rate and oxygen transmission rate of the prepared (reduced GO [rGO]/rAPGO) 10 deposited PI film (rGO/rAPGO/PI) and pure PI film. The water vapor transmission rate of the GO and APGO-coated PI composite film was increased due to the intrinsically hydrophilic property of the charged composite films. However, the oxygen transmission rate was decreased from 220 to 78 cm 3 /m 2 ·day·atm, due to the barrier effect of the graphene films on the PI surface. Since the proposed method allows for large-scale production of graphene films, it is considered to have potential for utilization in various applications.

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Section: Preparation Of Apgomentioning

confidence: 99%

Layer-by-layer assembled graphene oxide films and barrier properties of thermally reduced graphene oxide membranes

Kim¹,

Park²,

Lee³

et al. 2013

Carbon letters

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114

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“…Therefore, GO is used instead of graphene in majority of the composite processing. In many cases, the GO undergoes in situ reduction leading to the graphenereinforced composites [51][52][53]. The incorporation of graphene as a reinforcement in carbon foam is not explored so far.…”

Section: Introductionmentioning

confidence: 99%

Graphene-reinforced carbon composite foams with improved strength and EMI shielding from sucrose and graphene oxide

2015

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Graphene-reinforced carbon composite foams were prepared by thermo-foaming of graphene oxide (GO) dispersions in molten sucrose to form solid organic foams followed by carbonization at 900°C. The hydrogen bonding interactions between sucrose hydroxyls and functional groups on GO decreased the melting point of sucrose from 185 to 120°C when the GO concentration increased from 0 to 1.25 wt%. The viscosity of GO dispersions in molten sucrose increased gradually with an increase in GO concentration up to 0.75 wt% and then rapidly up to 1.25 wt%. The foaming time and foam setting time decreased drastically from 6 to 1 h and 34 to 9 h, respectively, when the GO concentration increased from 0.15 to 1.25 wt% due to the catalytic effect of GO toward -OH to -OH condensation. The density and cell size of the carbon composite foams depended on the GO concentration. A maximum compressive strength and specific compressive strength of 5.2 MPa and 21.3 MPa g -1 cm -3 , respectively, achieved at a very low GO concentration of 0.25 wt% corresponded to an increase of 189 and 133 %. The electrical conductivity and EMI shielding effectiveness (SE) of the graphene-reinforced carbon composite foams increased with an increase in the GO concentration up to 0.15 wt% and then decreased. The decrease was due to a decrease in foam density and GO agglomeration at higher GO concentrations. The maximum SE and specific SE of 38.6 dB and 160 dB g -1 cm -3 were achieved at GO concentrations of 0.15 and 1 wt%, respectively.

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“…All of the diffraction peaks can be unambiguously assigned to the standard MoS 2 nanocrystal with a hexagonal structure (JCPDS 37-1492), except for the broadened peak located at approximately 258 due to the signal from RGO. [34,35] Figure S1b shows the Raman spectra of the GO and MoS 2 /RGO powders in the higher wavenumber region, in which the D-band (1340 cm À1 ) and G-band…”

Section: Resultsmentioning

confidence: 99%

Molybdenum Disulfide/Reduced Graphene Oxide–Carbon Nanotube Hybrids as Efficient Catalytic Materials in Dye‐Sensitized Solar Cells

Lin

Chang

et al. 2015

ChemElectroChem

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A hybrid material has been fabricated by combining MoS2/reduced graphene oxide (RGO) nanocomposites with carbon nanotubes (CNTs) (designated MoS2/RGO‐CNTs) through facile electrophoretic deposition. The MoS2/RGO‐CNTs hybrid benefits from the advantages of both MoS2/RGO and CNTs as a counter electrode (CE) in dye‐sensitized solar cells (DSCs). According to a series of electrochemical results, the incorporation of conductive networks of CNTs provides additional pathways for electron transport in the MoS2/RGO‐CNTs hybrid, which increases the charge‐transfer rate at the CE/electrolyte interface. As a result, the MoS2/RGO‐CNTs CE exhibits greatly improved electrocatalytic activity compared with that of MoS2/RGO alone. A DSC incorporating the MoS2/RGO‐CNTs CE achieves impressive cell performance of 7.46 %, which is higher than those measured with DSCs incorporating MoS2/RGO CE (6.82 %) and Pt CE (7.23 %).

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In Situ Synthesis of Thermochemically Reduced Graphene Oxide Conducting Nanocomposites

Cited by 109 publications

References 29 publications

Layer-by-layer assembled graphene oxide films and barrier properties of thermally reduced graphene oxide membranes

Layer-by-layer assembled graphene oxide films and barrier properties of thermally reduced graphene oxide membranes

Graphene-reinforced carbon composite foams with improved strength and EMI shielding from sucrose and graphene oxide

Molybdenum Disulfide/Reduced Graphene Oxide–Carbon Nanotube Hybrids as Efficient Catalytic Materials in Dye‐Sensitized Solar Cells

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