scholarly journals Thermal Transport of Flexural and In-Plane Phonons Modulated by Bended Graphene Nanoribbons

2016 ◽  
Vol 2016 ◽  
pp. 1-7
Author(s):  
Changning Pan ◽  
Jun He ◽  
Diwu Yang ◽  
Keqiu Chen
Keyword(s):  
Low Temperature ◽  
Transport Properties ◽  
Thermal Transport ◽  
Phonon Dispersion ◽  
Graphene Nanoribbons ◽  
Structural Parameters ◽  
Thermal Conductance ◽  
Phonon Modes ◽  
Thermal Transport Properties ◽  
Out Of Plane

Ballistic thermal transport properties are investigated comparatively for out-of-plane phonon modes (FPMs) and in-plane phonon modes (IPMs) in bended graphene nanoribbons (GNRs). Results show that the phonon modes transports can be modulated separately by the phonon dispersion mismatch between armchair and zigzag GNRs in considered system. The contribution of FPMs to total thermal conductance is larger than 50% in low temperature for perfect GNRs. But it becomes less than 20% in the bended GNRs. Furthermore, this contribution can be modulated by changing the structural parameters of the bended GNRs. The result is useful for the design of thermal or thermoelectric nanodevices in future.

scholarly journals Effects of Divacancy and Extended Line Defects on the Thermal Transport Properties of Graphene Nanoribbons

Nanomaterials ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 1609 ◽  
Author(s):  
Min Luo ◽  
Bo-Lin Li ◽  
Dengfeng Li
Keyword(s):  
Transport Properties ◽  
Thermal Transport ◽  
Phonon Scattering ◽  
Graphene Nanoribbons ◽  
Thermal Conductance ◽  
Low Frequency ◽  
Impurity Scattering ◽  
Low Frequencies ◽  
Thermal Transport Properties ◽  
Line Defects

The effects of divacancy, including isolated defects and extended line defects (ELD), on the thermal transport properties of graphene nanoribbons (GNRs) are investigated using the Nonequilibrium Green’s function method. Different divacancy defects can effectively tune the thermal transport of GNRs and the thermal conductance is significantly reduced. The phonon scattering of a single divacancy is mostly at high frequencies while the phonon scattering at low frequencies is also strong for randomly distributed multiple divacancies. The collective effect of impurity scattering and boundary scattering is discussed, which makes the defect scattering vary with the boundary condition. The effect on thermal transport properties of a divacancy is also shown to be closely related to the cross section of the defect, the internal structure and the bonding strength inside the defect. Both low frequency and high frequency phonons are scattered by 48, d5d7 and t5t7 ELD. However, the 585 ELD has almost no influence on phonon scattering at low frequency region, resulting in the thermal conductance of GNRs with 585 ELD being 50% higher than that of randomly distributed 585 defects. All these results are valuable for the design and manufacture of graphene nanodevices.

Low-Temperature Thermodynamic and Thermal-Transport Properties of Decagonal Al65Cu20Co15

1996 ◽  
Vol 77 (6) ◽  
pp. 1071-1074 ◽  
Author(s):  
K. Edagawa ◽  
M. A. Chernikov ◽  
A. D. Bianchi ◽  
E. Felder ◽  
U. Gubler ◽  
...  
Keyword(s):  
Low Temperature ◽  
Transport Properties ◽  
Thermal Transport ◽  
Thermal Transport Properties

scholarly journals Temperature and interlayer coupling induced thermal transport across graphene/2D-SiC van der Waals heterostructure

2022 ◽  
Vol 12 (1) ◽  
Author(s):  
Md. Sherajul Islam ◽  
Imon Mia ◽  
A. S. M. Jannatul Islam ◽  
Catherine Stampfl ◽  
Jeongwon Park
Keyword(s):  
High Temperatures ◽  
Thermal Transport ◽  
Van Der Waals ◽  
Thermal Conductance ◽  
Interlayer Coupling ◽  
Phonon Modes ◽  
Out Of Plane ◽  
System Temperature ◽  
Non Equilibrium Molecular Dynamics ◽  
Increasing Temperature

AbstractGraphene based two-dimensional (2D) van der Waals (vdW) materials have attracted enormous attention because of their extraordinary physical properties. In this study, we explore the temperature and interlayer coupling induced thermal transport across the graphene/2D-SiC vdW interface using non-equilibrium molecular dynamics and transient pump probe methods. We find that the in-plane thermal conductivity κ deviates slightly from the 1/T law at high temperatures. A tunable κ is found with the variation of the interlayer coupling strength χ. The interlayer thermal resistance R across graphene/2D-SiC interface reaches 2.71 $$\times$$ × 10–7$${\text{Km}}^{2} /{\text{W}}$$ Km 2 / W at room temperature and χ = 1, and it reduces steadily with the elevation of system temperature and χ, demonstrating around 41% and 56% reduction with increasing temperature to 700 K and a χ of 25, respectively. We also elucidate the heat transport mechanism by estimating the in-plane and out-of-plane phonon modes. Higher phonon propagation possibility and Umklapp scattering across the interface at high temperatures and increased χ lead to the significant reduction of R. This work unveils the mechanism of heat transfer and interface thermal conductance engineering across the graphene/2D-SiC vdW heterostructure.

scholarly journals Reduction of Lattice Thermal Conductivity in PbTe Induced by Artificially Generated Pores

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Jae-Yeol Hwang ◽  
Eun Sung Kim ◽  
Syed Waqar Hasan ◽  
Soon-Mok Choi ◽  
Kyu Hyoung Lee ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Pore Structure ◽  
Transport Properties ◽  
Thermoelectric Materials ◽  
Thermal Transport ◽  
Lattice Thermal Conductivity ◽  
Phonon Scattering ◽  
Phonon Modes ◽  
Thermal Transport Properties

Highly dense pore structure was generated by simple sequential routes using NaCl and PVA as porogens in conventional PbTe thermoelectric materials, and the effect of pores on thermal transport properties was investigated. Compared with the pristine PbTe, the lattice thermal conductivity values of pore-generated PbTe polycrystalline bulks were significantly reduced due to the enhanced phonon scattering by mismatched phonon modes in the presence of pores (200 nm–2 μm) in the PbTe matrix. We obtained extremely low lattice thermal conductivity (~0.56 W m−1 K−1at 773 K) in pore-embedded PbTe bulk after sonication for the elimination of NaCl residue.

Effect of pentagon–heptagon defect on thermal transport properties in graphene nanoribbons

Carbon ◽  
2013 ◽  
Vol 65 ◽  
pp. 181-186 ◽  
Author(s):  
Shi-Hua Tan ◽  
Li-Ming Tang ◽  
Zhong-Xiang Xie ◽  
Chang-Ning Pan ◽  
Ke-Qiu Chen
Keyword(s):  
Transport Properties ◽  
Thermal Transport ◽  
Graphene Nanoribbons ◽  
Thermal Transport Properties

Thermal transport in a graphene–MoS2 bilayer heterostructure: a molecular dynamics study

RSC Advances ◽  
2015 ◽  
Vol 5 (37) ◽  
pp. 29193-29200 ◽  
Author(s):  
Bo Liu ◽  
Fanming Meng ◽  
Chilla D. Reddy ◽  
Julia A. Baimova ◽  
Narasimalu Srikanth ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Transport Properties ◽  
Influencing Factors ◽  
Thermal Transport ◽  
Thermal Transport Properties ◽  
Out Of Plane

The in-plane and out-of-plane thermal transport properties of the graphene–MoS2 bilayer are investigated with several influencing factors being considered.

Thermal transport properties of rolled graphene nanoribbons

2013 ◽  
Vol 103 (7) ◽  
pp. 071908 ◽  
Author(s):  
Dengfeng Li ◽  
Bolin Li ◽  
Min Luo ◽  
Chunbao Feng ◽  
Tao Ouyang ◽  
...  
Keyword(s):  
Transport Properties ◽  
Thermal Transport ◽  
Graphene Nanoribbons ◽  
Thermal Transport Properties
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