Thermal rectification via asymmetric structural defects in graphene

Nobakht, A; Gandomi, Yasser Ashraf; Wang, Jiaqi; Bowman, Matthew H.; Marable, Drew C.; Garrison, Ben; Kim, Daekun; Shin, SangJoon

doi:10.1016/j.carbon.2018.02.087

Cited by 35 publications

(10 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The continuously elevated curvature promotes the interface contact area between graphene and water, which brings an impediment on thermal transport across graphene and water. A thermal rectification effect is often demonstrated in the graphene with asymmetric structural defects , and special junction connections. , However, the curvature graphene in our simulation is free of any defects and special junctions. In terms of the shape of curved graphene, the structure shows an asymmetry along the z direction.…”

Section: Resultsmentioning

confidence: 75%

Graphene Nanofluids as Thermal Management Materials: Molecular Dynamics Study on Orientation and Temperature Effects

Gao

et al. 2019

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

The dispersion of graphene nanoparticles in a fluid can enhance the thermophysical properties of the base liquid. The physics behind such a phenomenon has yet to be uncovered in the community. In this work, thermal transport in a graphene–water mixture is studied by classical molecular dynamics simulations. Several factors including orientation angle, curvature, thermal rectification, temperature, and van der Waals interaction are investigated, and special attention is paid to the effect on thermal conductance across graphene–water interfaces. It is found that thermal conductance increases from 13.92 to 26.70 MW/m2 K as the orientation angle is increased from 0° to 90°. When the curved graphene is introduced by altering the length to width ratio from 1.0 to 1.8, the thermal conductance is elevated. However, as the length to width ratio exceeds 1.8, such a trend does not continue due to the variation of the intrinsic thermal conductivity of graphene and the formation of the complex graphene–water interface. Even though the curved graphene introduces an asymmetric assembly, no thermal rectification effect is observed for diverse directions of heat flux. It is demonstrated that the enhancement of overall thermal conductance of nanofluids is ascribed to the interface thermal transport rather than the base liquid with increasing temperature. This correlation is suppressed in a hydrophilic interface due to the structural change of liquid layer adjacent to the interface.

show abstract

Section: Resultsmentioning

confidence: 75%

Graphene Nanofluids as Thermal Management Materials: Molecular Dynamics Study on Orientation and Temperature Effects

Gao

et al. 2019

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

show abstract

“…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

View full text Add to dashboard Cite

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.

show abstract

“…Hayashi et al [76] numerically investigated thermal rectification in asymmetrically-defective singlewalled carbon nanotubes. Similar to Li et al [77] , the system was treated as two segments of one-dimensional nonlinear lattices, with a smaller spring constant associated to the defective region as illustrated in Fig. 12.…”

Section: Asymmetric Structural Defectsmentioning

confidence: 99%

A review of thermal rectification in solid-state devices

Malik

Fobelets

2022

J. Semicond.

View full text Add to dashboard Cite

Thermal rectification, or the asymmetric transport of heat along a structure, has recently been investigated as a potential solution to the thermal management issues that accompany the miniaturization of electronic devices. Applications of this concept in thermal logic circuits analogous to existing electronics-based processor logic have also been proposed. This review highlights some of the techniques that have been recently investigated for their potential to induce asymmetric thermal conductivity in solid-state structures that are composed of materials of interest to the electronics industry. These rectification approaches are compared in terms of their quantitative performance, as well as the range of practical applications that they would be best suited to. Techniques applicable to a range of length scales, from the continuum regime to quantum dots, are discussed, and where available, experimental findings that build upon numerical simulations or analytical predictions are also highlighted.

show abstract

Thermal rectification via asymmetric structural defects in graphene

Cited by 35 publications

References 52 publications

Graphene Nanofluids as Thermal Management Materials: Molecular Dynamics Study on Orientation and Temperature Effects

Graphene Nanofluids as Thermal Management Materials: Molecular Dynamics Study on Orientation and Temperature Effects

Growth, charge and thermal transport of flowered graphene

A review of thermal rectification in solid-state devices

Contact Info

Product

Resources

About