Elastic constants of graphene oxide few-layer films: correlations with interlayer stacking and bonding

Riobóo, R. J. Jiménez; Climent‐Pascual, Esteban; Díez-Betriu, Xavier; Jiménez-Villacorta, Félix; Prieto, C.; Andrés, A. de

doi:10.1039/c4tc02883j

Cited by 13 publications

(7 citation statements)

References 29 publications

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“…The obtained flexural strength (ϭ) and modulus of elasticity(E) of RHGOF/CNTs are 4.4 TPa and 5.21 TPa respectively. These values are significantly higher than published 34 . Figure 2a, TEM image of RGOF that reveals very stable nature of transparent sheets.…”

Section: Resultscontrasting

confidence: 72%

Reduced holey graphene oxide film and carbon nanotubes sandwich structure as a binder-free electrode material for supercapcitor

Sammed

Pan

Asif

et al. 2020

Sci Rep

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A novel carbon nanotubes (CNTs) and reduced holey graphene oxide film (RHGOF) sandwich structure has been fabricated to enhance its electrochemical properties. CNTs are grown by a catalyst assisted chemical vapor deposition technique, interpenetrated between the RHGOF layers. A RHGOF/CNTs hybrid film is used as a binder-free supercapacitor electrode. The grown CNTs in the graphene layers structure act as spacers and bridges to increase the counductivity of RHGOF, while the grown CNTs on the surfaces of the graphene contribute to increase the specific surface area of RHGOF. The results demonstrate that the synthesized porous, flexible and binder free hybrid electrode has advantages of higher ion diffusion rate, longer diffusion length and larger ion accessible surface area as compared to the pristine graphene which results in an extra ordinary galvanostatic charge-discharge specific capacitance of 557 F/g at a current density of 0.5 A/g, with excellent rate capabilities and superior cyclic stabilities.In recent era, environment adaptability, portability and compatibility of electronics, hybrid electric vehicles are becoming challenging issues. Energy storage devices having high performance are the part and parcel of these aforementioned devices 1 . Because of its promising adventages, supercapacitor is one of the fascinating energy storage device, such as fast dynamic response, high power density, longer life span and good capability rate 2,3 . Therefore, explicit studies of the characteristics of supercapcitor electrode materials are very essential components that ultimately affect its electrochemical properties 1,4-7 . Most recently, researchers are trying their best to prepare flexible type of electrode materials possessing good cyclic stability, high performance output in terms of charge-discharge rates and specific capacitance.Graphene (GR), being a 2D nano-structured material, has already been acknowledged as an attractive material for supercapacitor electrode. As a single thick sheet of carbon atoms, due to the numerous profound physic-chemical properties,it has been presaged for transfiguring a wide range of technological area [8][9][10][11] . Moreover, it has high unique mechanical flexibility intrinsic electrical conductivity, theoretical gravimetric capacitance of about 550 F/g and remarkably large theoretical surface area of 2630 m 2 /g [11][12][13] . On the contrary, due to the extended π-conjugation in the basal plane, pristine GR has van der Waals forces and π-π interaction. Thus, GR sheets are stacked with each other under these effects. Their irreversible agglomeration not only hinders the ion diffusion rate, but also decreases accessible surface area and consequent reduction in the gravimetric capacitance 14-17 . To improve its capacitive performance, numerous methodologies have already been proposed. For instance, to prevent the restacking, conducting carbon materials as an active channel (such as carbon black, carbon nanotubes (CNTs)) and conducting polymers (such as polyaniline), have been use...

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Section: Resultscontrasting

confidence: 72%

Reduced holey graphene oxide film and carbon nanotubes sandwich structure as a binder-free electrode material for supercapcitor

Sammed

Pan

Asif

et al. 2020

Sci Rep

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“…Considering the relation B = E f τ 3 , the behavior can be explained by assuming a direct proportionality of skin thickness, τ, with GO concentration. If one considers a Young modulus on the order of ∼10 2 GPa, 40 then a skin layer in the range of 10−100 nm is expected. These considerations are actually in agreement with data obtained for very thin films (Figure 3c).…”

Section: ■ Discussionmentioning

confidence: 99%

Shear Rheology Control of Wrinkles and Patterns in Graphene Oxide Films

et al. 2018

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Drying graphene oxide (GO) films are subject to extensive wrinkling, which largely affects their final properties. Wrinkles were shown to be suitable in biotechnological applications; however, they negatively affect the electronic properties of the films. Here, we report on wrinkle tuning and patterning of GO films under stress-controlled conditions during drying. GO flakes assemble at an air-solvent interface; the assembly forms a skin at the surface and may bend due to volume shrinkage while drying. We applied a modification of evaporative lithography to spatially define the evaporative stress field. Wrinkle alignment is achieved over cm areas. The wavelength (i.e., wrinkle spacing) is controlled in the μm range by the film thickness and GO concentration. Furthermore, we propose the use of nanoparticles to control capillary forces to suppress wrinkling. An example of a controlled pattern is given to elucidate the potential of the technique. The results are discussed in terms of classical elasticity theory. Wrinkling is the result of bending of the wet solid skin layer assembled on a highly elastic GO dispersion. Wavelength selection is the result of energy minimization between the bending of the skin and the elastic deformation of the GO supporting dispersion. The results strongly suggest the possibility to tune wrinkles and patterns by simple physicochemical routes.

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“…We conclude that the elasticity theory used by Brevik [1] is not applicable in the analysis of the irreversible changes observed by Kundu et al [2]. A possible explanation of the deformed GO surface is provided by the low density of the GO film, given by ρ = 750 kg/m 3 [13], which suggests a complex material structure, which may have a very low irradiation damage threshold. The irreversibility of the deformation of the GO film also means that the interaction of light with the medium leads to changes in the molecular structure of the material.…”

Section: Kundu Et Al Experimentsmentioning

confidence: 75%

“…In the discussion of the stress-energymomentum (SEM) tensor of the MP theory, we will also use the following useful relations, which apply with high accuracy in the laboratory frame [see Eqs. (13) and (17) of Ref. [3]]:…”

Section: How Atoms With Negligible Kinetic Energy Can Carry a Masmentioning

confidence: 99%

Comment on “Analysis of recent interpretations of the Abraham-Minkowski problem”

Partanen

Tulkki

2019

Phys. Rev. A

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In a recent paper [I. Brevik, Phys. Rev. A 98, 043847 (2018)], Brevik analyzed the experiment by Kundu et al. [A. Kundu et al., Sci. Rep. 7, 42538 (2017)] reporting deformation of a graphene oxide (GO) film after it has been irradiated by a laser beam. The two-dimensional atomic force microscope (AFM) line scanning of the deformation of the GO film after switching off the laser beam takes by far too much time for any elastic changes to remain in the AFM scans. Thus, the changes in the GO film are irreversible and the optoelastic model used by Brevik is not applicable. The rough estimates of the kinetic energy and displacement of atoms by the optical force of a light pulse calculated by Brevik are correct, but in making a comparison with the corresponding high-precision results for the kinetic energy and displacement of atoms in our work [M. Partanen et al., Phys. Rev. A 95, 063850 (2017)], the kinetic energy of atoms is confused with their rest energy. The atoms and their masses are displaced forward by the field and their displaced rest energies give rise to an energy flux. The difference of arguments between ours and Brevik's culminates on the question whether the flux of rest energy caused by the displacement of the medium moving with light should be included in the total energy flux. We also show that the four-divergence of the stress-energy-momentum tensor of the mass polariton theory of light is zero.

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Elastic constants of graphene oxide few-layer films: correlations with interlayer stacking and bonding

Abstract: The dependence of the elastic constants of graphene oxide films on temperature is obtained and analysed in terms of in-plane and interlayer bonding.

Cited by 13 publications

References 29 publications

Reduced holey graphene oxide film and carbon nanotubes sandwich structure as a binder-free electrode material for supercapcitor

Reduced holey graphene oxide film and carbon nanotubes sandwich structure as a binder-free electrode material for supercapcitor

Shear Rheology Control of Wrinkles and Patterns in Graphene Oxide Films

Comment on “Analysis of recent interpretations of the Abraham-Minkowski problem”

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