Preparation of highly stacked graphene papers via site-selective functionalization of graphene oxide

Lee, Jea Uk; Lee, Wonoh; Yi, Jin; Yoon, Sang Su; Lee, Sang Bok; Jung, Byung Mun; Kim, Byung Sun; Byun, Joon‐Hyung

doi:10.1039/c3ta11717k

Cited by 48 publications

(29 citation statements)

References 48 publications

(46 reference statements)

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“…Laminar graphene oxide (GO) membranes have recently been developed by assembling through the vacuum filtration of micrometer-sized GO sheets, and they exhibit impressive performance including intensive hydrophilism, outstanding mechanical strength and good flexibility 1,2 . In specific, these membranes are formed by self-alignment of GO sheets based on several mechanisms, including gravitational force, steric hindrance and the "excluded volume" interactions between GO sheets having large lateral dimensions 3 .…”

Section: Introductionmentioning

confidence: 99%

Facile Fabrication of Graphene Membranes with Readily Tunable Structures

Shi¹,

Meng²,

Zhao³

et al. 2015

ACS Appl. Mater. Interfaces

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Advanced membranes that combine mechanical robustness with fast permeation are crucial to many applications such as water purification, ions selectivity, and gas separation. Graphene sheets offer a promising opportunity to fabricate thin, high-flux, and pressure-endurable membranes because of their unique 2D morphology, oxidizable surface, and electrical conductivity. We herein report a highly effective yet simple approach to the fabrication of graphene membranes featuring controllable oxidation degrees and thus tunable structures and properties. The graphene sheets comprise a single or a few layers with a lateral dimension of 50-100 nm; their C/O ratios can be manipulated from 4.1 for graphene with a low degree of oxidation (low-oxidation graphene) to 2.5 for medium-oxidation graphene to 1.3 for high-oxidation graphene, by controlling the proportion of phosphoric acid during the 60 min fabrication. Fabricated by simple vacuum filtration, the membranes exhibited various water flux from 200.0 to 20.0 L/m(2)·h·bar at 3 bar of pressure and mechanical robustness (Young's modulus can be up to 20 GPa and tensile strength to 100 MPa). When these membranes were used as electrodes for supercapacitors, specific capacitances of 58.8 F/g and 23.5 F/cm(3) were recorded for the low-oxidation graphene membrane at 1 A/g by a two-electrode configuration; the capacity values retained ∼95% after 800 cycles; the high capacitance would be caused by moderate wettability and high electrical conductivity.

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Section: Introductionmentioning

confidence: 99%

Facile Fabrication of Graphene Membranes with Readily Tunable Structures

Shi¹,

Meng²,

Zhao³

et al. 2015

ACS Appl. Mater. Interfaces

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show abstract

“…In this respect, one of the most used and preferred methods is the hydrothermal one, due to its low cost and easy implementation. By applying the simultaneous reduction and self-assembly of GO in the presence of amines and a subsequent freeze-drying procedure, aerogels could be synthesized to tackle the urgent environmental matter of highly selective and efficient CO 2 capture [8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Effect of Varying Amine Functionalities on CO2 Capture of Carboxylated Graphene Oxide-Based Cryogels

et al. 2020

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Graphene cryogels synthesis is reported by amine modification of carboxylated graphene oxide via aqueous carbodiimide chemistry. The effect of the amine type on the formation of the cryogels and their properties is presented. In this respect, ethylenediamine (EDA), diethylenetriamine (DETA), triethylenetetramine (TETA), were selected. The obtained cryogels were characterized by Fourier Transformed Infrared spectroscopy, thermogravimetric analysis, X-ray spectroscopy, and Scanning electron microscopy. The CO2 adsorption performance was evaluated as a function of amine modification. The results showed the best CO2 adsorption performance was exhibited by ethylenediamine modified aerogel, reaching 2 mmol g−1 at 1 bar and 298 K. While the total N content of the cryogels increased with increasing amine groups, the nitrogen configuration and contributions were determined to have more important influence on the adsorption properties. It is also revealed that the residual oxygen functionalities in the obtained cryogels represent another paramount factor to take into account for improving the CO2 capture properties of amine-modified graphene oxide (GO)-based cryogels.

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“…In order to suppress the restacking of GO sheets during self-assembly, the functionalization of GO sheets by various molecules including ethylenediamine (EDA) was investigated [16,17,18]. However, the gelation of GO sheets functionalized by EDA has not yet been studied extensively and the fundamental roles behind gelation phenomena have not been clearly revealed either.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Solvothermal Conditions on the Properties of Three-Dimensional N-Doped Graphene Aerogels

et al. 2019

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Low-density three-dimensional (3D) N-doped graphene aerogels by a one-step solvothermal method in the presence of ethylenediamine (EDA) are reported. The gelation, formation, and properties of the aerogels were studied with solvothermal conditions, namely, operating temperature, time, graphene oxide (GO) concentration, and the GO/EDA w/w ratio. Two ranges of solvothermal conditions are employed: one involving an operating temperature below 100 °C and a conventional chemical reduction of GO with EDA at atmospheric pressure and a second one employing a higher temperature range up to 165 and a high pressure reduction with EDA. The results show that both solvothermal approaches allow for the fabrication of homogeneous N-doped 3D graphene aerogels with density values close to 10 mg cm−3. The measurements indicated that low values of GO concentration, temperature, and EDA are optimum for obtaining low-density 3D aerogels. N doping is improved with an EDA amount in lower temperature conditions. The N doping mechanism below 100 °C is dominated by the epoxy ring opening while at temperatures up to 165 °C both epoxy ring opening and amidation take place. The CO2 adsorption properties are strongly controlled by the nitrogen configuration, namely, pyridinic nitrogen in terms of its density.

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Preparation of highly stacked graphene papers via site-selective functionalization of graphene oxide

Cited by 48 publications

References 48 publications

Facile Fabrication of Graphene Membranes with Readily Tunable Structures

Facile Fabrication of Graphene Membranes with Readily Tunable Structures

Effect of Varying Amine Functionalities on CO2 Capture of Carboxylated Graphene Oxide-Based Cryogels

The Effect of Solvothermal Conditions on the Properties of Three-Dimensional N-Doped Graphene Aerogels

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