Low-temperature thermal conductivity in polycrystalline graphene

Kolesnikov, D. V.; Osipov, V. A.

doi:10.1209/0295-5075/100/26004

Cited by 12 publications

(9 citation statements)

References 26 publications

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“…It should also be mentioned that T o characterizes the temperature when the wavelength of an incident phonon becomes comparable with the size of the GB. T GB decreases with an increase of the packing coefficient, the misorientation angle and/or sample size, while T o depends on the grain boundary length only [94]. Using non-equilibrium molecular dynamics simulations, it was shown that the boundary conductance on the tilt GBs are in the range 1.5 × 10 10 -4.5 × 10 10 W m −2 K −1 , which is significantly higher than that of any other thermoelectric interfaces reported in the literature [95].…”

Section: Thermal Transportmentioning

confidence: 98%

“…Theoretical calculations predict two distinct temperature ranges, below and above T * , a crossover temperature at low temperatures. T * ≈ T o /2, where T o is governed by the dominant phonon mode [94]. Above T * the thermal conductivity behaves like T 2 , while below T * the behavior is acutely sensitive to T GB , it behaves like T α , where α values range from 1 to 2 with increasing T GB .…”

Section: Thermal Transportmentioning

confidence: 99%

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Grain boundaries in graphene grown by chemical vapor deposition

2013

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The scientific literature on grain boundaries (GBs) in graphene was reviewed. The review focuses mainly on the experimental findings on graphene grown by chemical vapor deposition (CVD) under a very wide range of experimental conditions (temperature, pressure hydrogen/hydrocarbon ratio, gas flow velocity and substrates). Differences were found in the GBs depending on the origin of graphene: in micro-mechanically cleaved graphene (produced using graphite originating from high-temperature, high-pressure synthesis), rows of non-hexagonal rings separating two perfect graphene crystallites are found more frequently, while in graphene produced by CVD-despite the very wide range of growth conditions used in different laboratories-GBs with more pronounced disorder are more frequent. In connection with the observed disorder, the stability of two-dimensional amorphous carbon is discussed and the growth conditions that may impact on the structure of the GBs are reviewed. The most frequently used methods for the atomic scale characterization of the GB structures, their possibilities and limitations and the alterations of the GBs in CVD graphene during the investigation (e.g. under e-beam irradiation) are discussed. The effects of GB disorder on electric and thermal transport are reviewed and the relatively scarce data available on the chemical properties of the GBs are summarized. GBs are complex enough nanoobjects so that it may be unlikely that two 3 www.nanotechnology.hu 4

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Section: Thermal Transportmentioning

confidence: 98%

Section: Thermal Transportmentioning

confidence: 99%

Grain boundaries in graphene grown by chemical vapor deposition

2013

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“…In pristine systems, the main phonon scattering mechanism is anharmonicity, manifested in three-phonon processes, and graphene owes its high thermal conductivity to the high density of states of its flexural phonon branch at low energies, together with a symmetry-induced selection rule for three-phonon scattering processes [48]. Several theoretical studies have also addressed the broader problem of thermal transport in defect-laden graphene [49][50][51][52][53][54][55] and graphene nanostructures [56][57][58]. However, in general those studies use either classical molecular dynamics or simple parametric models, both of which fail to give a detailed insight into the phonon physics underpinning the complex transport behavior in these systems.…”

Section: Introductionmentioning

confidence: 99%

Growth, charge and thermal transport of flowered graphene

Cresti

Carrete

Okuno

et al. 2020

Carbon

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We report on the structural and transport properties of the smallest dislocation loop in graphene, known as a flower defect. First, by means of advanced experimental imaging techniques, we deduce how flower defects are formed during recrystallization of chemical vapor deposited graphene. We propose that the flower defects arise from a bulge type mechanism in which the flower domains are the grains left over by dynamic recrystallisation. Next, in order to evaluate the use of such defects as possible building blocks for all-graphene electronics, we combine multiscale modeling tools to investigate the structure and the electron and phonon transport properties of large monolayer graphene samples with a random distribution of flower defects. For large enough flower densities, we find that electron transport is strongly suppressed while, surprisingly, hole transport remains almost unaffected. These results suggest possible applications of flowered graphene for electron energy filtering. For the same defect densities, phonon transport is reduced by orders of magnitude as elastic scattering by defects becomes dominant. Heat transport by flexural phonons, key in graphene, is largely suppressed even for very low concentrations.

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“…Similar to the case of 2D graphene samples, the power in the power-law dependence of thermal conductivity on temperature is reduced due to the presence of domain walls (cf. [5]). At higher temperatures the grain boundary scattering results in constant mean free path and reducing the role of exural ZA phonon mode, reducing the magnitude of heat conductivity and leaving the power-law temperature dependence intact.…”

Section: Resultsmentioning

confidence: 99%

The influence of grain boundaries on the low-temperature thermal conductivity of graphene nanoribbons

Kolesnikov

Osipov

2015

Phys. Part. Nuclei Lett.

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The low-temperature thermal conductivity of suspended long and narrow graphene ribbon with domain walls is investigated. Three acoustic phonon branches and the torsion mode are taken into account. The in uence of domain walls replaces the low-temperature ©quantum-wireª behaviour of thermal conductivity κ ∼ T with T n behaviour, where n < 1. The transition from ©quantum-wireª to ©2D grapheneª-like behaviour is shifted to the higher temperature when domain walls are present.

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Low-temperature thermal conductivity in polycrystalline graphene

Cited by 12 publications

References 26 publications

Grain boundaries in graphene grown by chemical vapor deposition

Grain boundaries in graphene grown by chemical vapor deposition

Growth, charge and thermal transport of flowered graphene

The influence of grain boundaries on the low-temperature thermal conductivity of graphene nanoribbons

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