Graphene as a Prototypical Model for Two-Dimensional Continuous Mechanics

Lambin, Philippe

doi:10.3390/app7080830

Cited by 3 publications

(2 citation statements)

References 56 publications

(84 reference statements)

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“…Since the chemical conditions for the synthesis of the PyC films of different thicknesses were equivalent, the difference in the positions of the peaks caused by surface functionalization, which could occur during the synthesis process, was not expected. Following the theoretical estimations [ 41 ], peak displacement is most likely a result of mechanical stresses. Such a conclusion is supported by the fact that there was no shift in the position of the G-mode in the Raman spectrum of the PyC deposited onto SiO 2 and bSi.…”

Section: Resultsmentioning

confidence: 99%

Macro-, Micro- and Nano-Roughness of Carbon-Based Interface with the Living Cells: Towards a Versatile Bio-Sensing Platform

Golubewa

Rehman

Kulahava

et al. 2020

Sensors

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Integration of living cells with nonbiological surfaces (substrates) of sensors, scaffolds, and implants implies severe restrictions on the interface quality and properties, which broadly cover all elements of the interaction between the living and artificial systems (materials, surface modifications, drug-eluting coatings, etc.). Substrate materials must support cellular viability, preserve sterility, and at the same time allow real-time analysis and control of cellular activity. We have compared new substrates based on graphene and pyrolytic carbon (PyC) for the cultivation of living cells. These are PyC films of nanometer thickness deposited on SiO2 and black silicon and graphene nanowall films composed of graphene flakes oriented perpendicular to the Si substrate. The structure, morphology, and interface properties of these substrates are analyzed in terms of their biocompatibility. The PyC demonstrates interface biocompatibility, promising for controlling cell proliferation and directional intercellular contact formation while as-grown graphene walls possess high hydrophobicity and poor biocompatibility. By performing experiments with C6 glioma cells we discovered that PyC is a cell-friendly coating that can be used without poly-l-lysine or other biopolymers for controlling cell adhesion. Thus, the opportunity to easily control the physical/chemical properties and nanotopography makes the PyC films a perfect candidate for the development of biosensors and 3D bioscaffolds.

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Section: Resultsmentioning

confidence: 99%

Macro-, Micro- and Nano-Roughness of Carbon-Based Interface with the Living Cells: Towards a Versatile Bio-Sensing Platform

Golubewa

Rehman

Kulahava

et al. 2020

Sensors

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“…45 Thus, it is expected that graphene will tend to bend or wrinkle rather easily in order to relieve in-plane compression. [143][144][145] The interaction between the graphene layer and its supporting surface, namely the graphene-substrate adhesion, is therefore an extremely important parameter governing the graphene response to biaxial compression: if the graphene-substrate adhesion is poor, the graphene will not fully follow the substrate's deformation and instead will slide or wrinkle to reduce its stress. However, the adhesion of graphene to its substrate is an intricate mixture of (a) the interaction energy between carbon and surface atoms, (b) substrate surface roughness, (c) graphene number of layers, (d) commensurability of the graphene and substrate lattices, and (e) the normal force from the PTM, which must modify the effects of (a) to (d).…”

Section: Role Of the Substratementioning

confidence: 99%

Mechanical properties of graphene

Sun

Papageorgiou

Humphreys

et al. 2021

Applied Physics Reviews

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150Åand ethene at 1.33Å bond length) and smallest for triple-bonded carbon (acetylene, 1.20 151Å). On the other hand, the van der Waals (vdW) radius of a carbon atom is given as 1.70152Å . An early measurement of the thickness of the benzene molecule gave 4.70Å, 10 while the 153 thickness of the larger pyrene molecule is 3.53Å, 11 very close to the spacing of the graphene 154 sheets in graphite at 3.35Å.155 These considerations appear to give a clear meaning to the concept of the vdW thickness 156 of graphene, as much as of simpler molecules such as benzene and the higher polycyclic 157 aromatic compounds such as pyrene. It expresses the distance of closest approach of other 158 physisorbed atoms -whether carbon or anything else, because the repulsive interatomic 159 potential deriving from Pauli exclusion is largely independent of the nature of the interacting 160 atoms, and in the absence of a chemical bond, so is the vdW attractive potential. Following 161 Wyckoff, 9 the thickness should be expected to vary with the environment, whether it is a 162 surrounding gas or a substrate, as can be seen in Table I -even quite considerably as the 163 vdW forces, while always weak, can vary by an order of magnitude. 164 B. Graphene elastic stiffness tensor 165 Only in graphite is graphene found in a symmetrical environment (sandwiched between 166 graphene sheets with only a vdW potential binding them) and with a known thickness. We 167 may then define the graphene elastic stiffness constants c ij in this situation as a reference 168 system. To deal with possible variations in thickness in other environments, it makes sense

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Broadband and polarization sensitive quasi-1D Nb2Pd3Se8 photodetector

Wang,

Wen

et al. 2024

AIP Advances

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High-performance photodetectors (PDs) find potential applications in extensive areas such as self-driving vehicles, resource monitoring, imaging, communication, etc. However, low sensitivity, slow response speed, and poor air stability have limited their application. In this work, we construct an air stable one-dimensional ternary transition metal chalcogenide Nb2Pd3Se8-based PD that has high sensitivity and fast response and is polarization-sensitive. The Nb2Pd3Se8 nanowire-based PD shows a maximum responsivity of 47 A W−1, a detectivity of 3.28 × 1011 Jones, and a response time of 50–65 µs under 520 nm laser illumination. In addition, the 1D PD shows polarization-sensitivity with a 0.47 anisotropic ratio. This performance paves way to construct robust air stable PDs with high detectivity and high responsivity using one-dimensional Nb2Pd3Se8-based nanostructures.

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Graphene as a Prototypical Model for Two-Dimensional Continuous Mechanics

Cited by 3 publications

References 56 publications

Macro-, Micro- and Nano-Roughness of Carbon-Based Interface with the Living Cells: Towards a Versatile Bio-Sensing Platform

Macro-, Micro- and Nano-Roughness of Carbon-Based Interface with the Living Cells: Towards a Versatile Bio-Sensing Platform

Mechanical properties of graphene

Broadband and polarization sensitive quasi-1D Nb2Pd3Se8 photodetector

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