Synthesize and characterization of graphene nanosheets with high surface area and nano-porous structure

Seresht, Razieh Jabari; Jahanshahi, Mohsen; Rashidi, Alimorad; Ghoreyshi, Ali Asghar

doi:10.1016/j.apsusc.2013.03.152

Cited by 80 publications

(15 citation statements)

References 23 publications

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“…Generally porous graphene contains holes either with random or high regularity. This spongy structure of NPG leads to high surface areas, a hydrophobic nature, and low cost to manufacture …”

Section: Introductionmentioning

confidence: 99%

A study of rigid polyurethane foams: The effect of synthesized polyols and nanoporous graphene

Hoseinabadi

Naderi

Najafi

et al. 2017

J of Applied Polymer Sci

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Rigid polyurethane foams (RPUF) with nanoporous graphene (NPG) were synthesized and their properties, including density, mechanical, morphological, and thermal‐resistant properties were studied. In the current work, polyols of the RPUF formulation were synthesized and NPG content was varied from 0.1 to 0.5 wt %. Scanning electron microscopy (SEM) observation was used to observe the dispersion of NPG and cell size in the RPUF nanocomposites. Only 0.25 wt % of NPG improved compressive strength and modulus respectively by 10.7% and 66.5%. The TGA analysis confirmed that an increase in NPG loading slightly increase the degradation temperature of the samples. These results additionally indicated that NPG enhances the mechanical properties of the RPUF nanocomposites more effectively compared to other nanoparticles (clay, silica etc.). The superiority of NPG over other nanoparticles can be attributed to unique two‐dimensional geometrical morphology and a higher specific surface area. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45001.

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Section: Introductionmentioning

confidence: 99%

A study of rigid polyurethane foams: The effect of synthesized polyols and nanoporous graphene

Hoseinabadi

Naderi

Najafi

et al. 2017

J of Applied Polymer Sci

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“…Another key parameter of rGO materials is the specific surface area (SSA), the number of layers ( N G ) present on a rGO material can be estimated by dividing the theoretical SSA of a single layer graphene by experimentally determined BET of our material ( N G = 2630/BET) . The BET SSA of prepared rGO (Table ) is similar to other rGO materials, and far below to the theoretical one. This is attributed to incomplete exfoliation during sonication and to the inaccessible surface caused by agglomeration .…”

Section: Resultsmentioning

confidence: 83%

Processing influence on dielectric, mechanical, and electrical properties of reduced graphene oxide–TPU nanocomposites

Gómez

Recio

Navas

et al. 2018

J of Applied Polymer Sci

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Two different reduced graphene oxides (rGOs) with similar concentration of oxygen and defects and differences in exfoliation were prepared to produce the rGO/thermoplastic polyurethane nanocomposites by solution blending (SB) and melt compounding (MC). Morphology, electrical, and dielectric properties were studied. Large agglomerates have been observed for the composites produced by SB and discrete and low agglomerated rGO particles in the case on the composites produced by MC. These morphological differences justify the observations in hardness, electrical conductivity, and even in the dielectric properties. The composites do not follow Jonscher's universal power law (UPL) and a linear trend between UPL factors (Log A vs n) has been observed for composites produced by SB, however, no trend is observed in the composites produced by MC, being the first time observed. Differences in the tunneling effect and breakage of H-bonds within the polymer can be suggested from the dielectric relaxation characterization.

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“…Figure presents the XRD patterns of the synthesized graphene, and the structural parameters are shown in Table . Graphene and nanoporous graphene have strong peaks at 2θ = 26.94° and 26.81°, respectively, which are the characteristic peaks of graphene, indicating that the graphene‐based compounds synthesized by the CVD method are present individually in single or fewer layers . The XRD pattern of GO shows a sharp peak at 2θ = 11.68°, corresponding to an interlayer distance of 7.61 A°.…”

Section: Resultsmentioning

confidence: 99%

“…As observed in Fig. b, the structure of nanoporous graphene is highly porous, which increases the surface area and thus the sorption capacity of nanoporous graphene compared to other graphene types with non‐porous sheets, synthesized by other methods . As observed in Fig.…”

Section: Resultsmentioning

confidence: 99%

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Preparation of different graphene nanostructures for hydrogen adsorption

Elyassi

Rashidi²,

Hantehzadeh

et al. 2016

Surf. Interface Anal.

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In this study, different types of graphene were synthesized to investigate hydrogen adsorption capacity at different pressures (0–34 bar) at room temperature (298 K). Graphene and nanoporous graphene were prepared by Chemical Vapor Deposition (CVD) method, using methane as a carbon source at a temperature of 900 °C over copper plates and nickel oxide nanocatalyst. The nickel oxide nanocatalyst was prepared by sol–gel method, whereas graphene oxide was prepared through modified Hummer's method. The products were characterized by X‐ray diffraction, field emission‐scanning electron microscopy, energy dispersive spectroscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, Brunauer–Emmett–Teller and Raman spectroscopy. The adsorption of hydrogen was done by volumetric method. High adsorption capacity was achieved in nanoporous graphene because of its high pore volume (2.11 cm3/g) and large specific surface area (850 m2/g). Hydrogen adsorption values for nanoporous graphene, graphene and graphene oxide were determined as 2.56, 1.70 and 0.74 wt%, respectively. In addition, the hydrogen adsorption of graphene nanostructures fitted nicely to the selected two‐parameter and three‐parameter adsorption isotherm models. The adsorption isotherm model coefficients have been found for a 0–34 bar pressure range. The parameter values for all adsorbents showed proper conformity to the model and experimental data. Copyright © 2016 John Wiley & Sons, Ltd.

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Synthesize and characterization of graphene nanosheets with high surface area and nano-porous structure

Cited by 80 publications

References 23 publications

A study of rigid polyurethane foams: The effect of synthesized polyols and nanoporous graphene

A study of rigid polyurethane foams: The effect of synthesized polyols and nanoporous graphene

Processing influence on dielectric, mechanical, and electrical properties of reduced graphene oxide–TPU nanocomposites

Preparation of different graphene nanostructures for hydrogen adsorption

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