Nanoindentation models and Young’s modulus of few-layer graphene: a molecular dynamics simulation study

Liu, Xiang; Ying, Shuang; Wang, Fang; Zhang, Kaiwang

doi:10.1088/0022-3727/48/39/395305

Cited by 26 publications

(14 citation statements)

References 31 publications

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“…It should be noted that some literatures have reported the fact that the value of the thickness-dependent Young's modulus is different in different strain areas. [3,[26][27][28][29] Adv. Mater.…”

Section: Resultsmentioning

confidence: 99%

“…Interfaces 2017, 4, 1601023 www.advmatinterfaces.de www.advancedsciencenews.com The molecular dynamics simulations further elucidate that the Young's modulus corresponding to small deflection scope is much higher than that corresponding to large deflection. [29] Therefore, in terms of the measured Young's modulus (≈1 TPa) of 1-5 layer graphene by fitting atmospheric pressure of 0.25-0.5 MPa by Koenig et al [26] and the solved Young's modulus of multilayer graphene by molecular dynamics simulations by Xiang et al, [29] the Young's modulus of graphene in this paper is approximately set to be 1 TPa.…”

Section: Resultsmentioning

confidence: 99%

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Measuring Graphene Adhesion on Silicon Substrate by Single and Dual Nanoparticle‐Loaded Blister

Gao

et al. 2017

Adv Materials Inter

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and various substrates is essential for graphene-based nanomechanical and nanoelectric devices. [12,13] In recent years, a large number of experimental studies of measuring interfacial adhesion energies between mechanically exfoliated graphene or chemically vapor deposited (CVD) graphene and support substrates have been reported by using the pressurized blister test with intercalated nanoparticles, [14] inflated air, [15,16] and deionized water, [17] double cantilever beam fracture mechanics test, [18] pleat defect measurement, [19] atomic force microscope (AFM) nanoindentation, [20][21][22] and optical fiber Fabry-Perot interference. [23] Although the discrepancy exists in the measurement results due to the nonuniformity of fabricated graphene membranes and principle errors of various measurement methods, these experimental studies have significantly advanced the understanding of graphene adhesion behaviors. Unfortunately, such approaches to determine the adhesion energy of graphene and a substrate typically involve specific measurement setups and professional sample fabrication or test procedures, as well as relatively complicated analytical models for adhesion energies. Even if for the AFM nanoindentation method recently utilized more, the extremely thin sheet is hard to handle and prone to damage by clamps and fixtures as in the conventional peel test, [14] and the effect of surface roughness of the spherical tip of AFM should be addressed by the modified Rumpf model. [21] Moreover, the disturbance of the pull-off instability generally occurs during the tip-sample interaction. [24] For this reason, a simple, general, and direct measurement of adhesion energy for graphene membranes on a variety of substrates is highly necessary.In this paper, we demonstrated an improved nanoscale quantification study of adhesion energy of CVD graphene membranes with different layer thicknesses on SiO 2 substrate, by directly measuring the size (diameter and height) of graphene bubbles covered with single and dual gold nanoparticles showing regular circular or elliptical geometries, respectively. This presented method differs from the aforementioned ref. [14] in which only isolated single particles with regular circular blister geometries are available. This resulting disadvantage is that the sample fabrication process is possibly repeated many times to achieve satisfactory results by locating those tiny regular single nanoparticles via scanning electron microscope (SEM). However, regular blister geometries formed by two particles can also contribute to the solution of interfacial adhesion energy of graphene on substrates. Hence, to extend the applicability and robustness of this presented method, a generalized van der Waals adhesion behavior at the interface between graphene and support substrates is important to characterize the performance of graphenebased sensors. Here an improved, general, and direct method of determining the adhesion energies of monolayer/few-layer/multilayer graphene sheets on silicon wafers is demonstra...

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Measuring Graphene Adhesion on Silicon Substrate by Single and Dual Nanoparticle‐Loaded Blister

Gao

et al. 2017

Adv Materials Inter

View full text Add to dashboard Cite

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“…Most recently synthetized bio-compatible FLGs, or graphene platelets differently speaking, do not exceed a few hundred nm in size [ 18 ]. According to the experimental and theoretical evaluations, FLG/MLG has a similar Young’s modulus, i.e., around 1TPa, to monolayer graphene [ 19 ], while the conductivity is affected by the perpendicular component that is three orders of magnitude lower than in the planar direction [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

Polyvinyl Alcohol-Few Layer Graphene Composite Films Prepared from Aqueous Colloids. Investigations of Mechanical, Conductive and Gas Barrier Properties

et al. 2020

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Quasi all water soluble composites use graphene oxide (GO) or reduced graphene oxide (rGO) as graphene based additives despite the long and harsh conditions required for their preparation. Herein, polyvinyl alcohol (PVA) films containing few layer graphene (FLG) are prepared by the co-mixing of aqueous colloids and casting, where the FLG colloid is first obtained via an efficient, rapid, simple, and bio-compatible exfoliation method providing access to relatively large FLG flakes. The enhanced mechanical, electrical conductivity, and O2 barrier properties of the films are investigated and discussed together with the structure of the films. In four different series of the composites, the best Young’s modulus is measured for the films containing around 1% of FLG. The most significant enhancement is obtained for the series with the largest FLG sheets contrary to the elongation at break which is well improved for the series with the lowest FLG sheets. Relatively high one-side electrical conductivity and low percolation threshold are achieved when compared to GO/rGO composites (almost 10−3 S/cm for 3% of FLG and transport at 0.5% FLG), while the conductivity is affected by the formation of a macroscopic branched FLG network. The composites demonstrate a reduction of O2 transmission rate up to 60%.

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“…For example, experiments aiming to investigate the sliding motion between graphene sheets under metastable conditions as depicted in Figure 6d could be organized in the following steps: (1) generation of double layers of graphene (or graphene oxide), for instance by Langmuir-Blodgett assembly [41]; (2) compression of the double layers of graphene by means of a nano-indenter [42]; and (3) measurement of the forces occurring during the sliding dynamics by means of a nano-manipulator [26]. Note that characterization techniques such as atomic force microscopy (AFM) or in situ Raman mapping [43], as well as atomistic simulations [44,45], could support the experimental implementation and analysis of this system. Finally, the nano-spring concept outlined in this article could also be implemented and validated by experiments with systems made of multi-walled carbon nanotubes under telescopic motion [26].…”

Section: Sheet-sheet Slidingmentioning

confidence: 99%

Sliding Dynamics of Parallel Graphene Sheets: Effect of Geometry and Van Der Waals Interactions on Nano-Spring Behavior

et al. 2018

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Graphene and carbon nanotubes are promising materials for nanoelectromechanical systems. Among other aspects, a proper understanding of the sliding dynamics of parallel graphene sheets or concentric nanotubes is of crucial importance for the design of nano-springs. Here, we analytically investigate the sliding dynamics between two parallel, rigid graphene sheets. In particular, the analysis focuses on configurations in which the distance between the sheets is kept constant and lower than the equilibrium interlayer spacing of graphite (unstable configurations). The aim is to understand how the interlayer force due to van der Waals interactions along the sliding direction changes with the geometrical characteristics of the configuration, namely size and interlayer spacing. Results show metastable equilibrium positions with completely faced sheets, namely a null force along the sliding direction, whereas net negative/positive forces arise when the sheets are approaching/leaving each other. This behavior resembles a molecular spring, being able to convert kinetic into potential energy (van der Waals potential), and viceversa. The amplitude of both storable energy and entrance/exit forces is found to be proportional to the sheet size, and inversely proportional to their interlayer spacing. This model could also be generalized to describe the behavior of configurations made of concentric carbon nanotubes, therefore allowing a rational design of some elements of carbon-based nanoelectromechanical systems.

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Nanoindentation models and Young’s modulus of few-layer graphene: a molecular dynamics simulation study

Cited by 26 publications

References 31 publications

Measuring Graphene Adhesion on Silicon Substrate by Single and Dual Nanoparticle‐Loaded Blister

Measuring Graphene Adhesion on Silicon Substrate by Single and Dual Nanoparticle‐Loaded Blister

Polyvinyl Alcohol-Few Layer Graphene Composite Films Prepared from Aqueous Colloids. Investigations of Mechanical, Conductive and Gas Barrier Properties

Sliding Dynamics of Parallel Graphene Sheets: Effect of Geometry and Van Der Waals Interactions on Nano-Spring Behavior

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