Unexpected thermal conductivity enhancement in pillared graphene nanoribbon with isotopic resonance

Ma, Dengke; Xiao, Wen‐Jing; Yang, Nuo

doi:10.1103/physrevb.98.245420

Cited by 89 publications

(71 citation statements)

References 62 publications

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“…Different type of MoS2NT is constructed by rolling up SLMoS2 based on specific lattice vector r = ma1 + na2, where the lattice constants of the primitive cell are a1= a2=3.147 Å (as shown in figure 1a). Noting that our study only focuses on armchair nanotube (aNT, m=n) and zigzag nanotube (zNT, The classical non-equilibrium molecular dynamics (NEMD) method has been employed in the calculation of thermal properties [12][13][14][15][16][17]. The thermal conductivity is calculated based on the Fourier's law of heat conduction as…”

Section: Model and Methodsmentioning

confidence: 99%

Thermal conductivity of molybdenum disulfide nanotube from molecular dynamics simulations

Han

et al. 2019

International Journal of Heat and Mass Transfer

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Single layer molybdenum disulfide (SLMoS2), a semiconductor possesses intrinsic bandgap and high electron mobility, has attracted great attention due to its unique electronic, optical, mechanical and thermal properties. Although thermal conductivity of SLMoS2 has been widely investigated recently, less studies focus on molybdenum disulfide nanotube (MoS2NT). Here, the comprehensive temperature, size and strain effect on thermal conductivity of MoS2NT are investigated. A chiralitydependent strain effect is identified in thermal conductivity of zigzag nanotube, in which the phonon group velocity can be significantly reduced by strain. Besides, results show that thermal conductivity has a ~T -1 and a ~L β relation with temperature from 200 to 400 K and length from 10 to 320 nm, respectively. This work not only provides feasible strategies to modulate the thermal conductivity of MoS2NT, but also offers useful insights into the fundamental mechanisms that govern the thermal conductivity, which can be used for the thermal management of low dimensional materials in optical, electronic and thermoelectrical devices.

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Section: Model and Methodsmentioning

confidence: 99%

Thermal conductivity of molybdenum disulfide nanotube from molecular dynamics simulations

Han

et al. 2019

International Journal of Heat and Mass Transfer

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“…higher average temperature in the PnC defect, which additionally leads to an increased thermal response. It should, however, be mentioned that the localized temperature is not a result of phonon localization due to the PnC as has been reported in previous investigations [23,24]. Given the huge differences in the wavelengths of heat-transporting phonons (on the order of nanometers) and the lattice constants used here (≥ 30 μm), the PnC cannot control the heat flow coherently.…”

Section: Introductionmentioning

confidence: 57%

Thermal Transport and Frequency Response of Localized Modes on Low-Stress Nanomechanical Silicon Nitride Drums Featuring a Phononic-Band-Gap Structure

et al. 2020

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Development of broadband thermal sensors for the detection of, among others, radiation, single nanoparticles, or single molecules is of great interest. In recent years, photothermal spectroscopy based on the shift of the resonance frequency of stressed nanomechanical resonators has been successfully demonstrated. Here, we show the application of soft-clamped phononic crystal membranes made of silicon nitride as thermal sensors. It is experimentally demonstrated how a quasi-band-gap remains even at very low tensile stress, in agreement with finite-element-method simulations. An increase of the relative responsivity of the fundamental defect mode is found when compared to that of uniform square membranes of equal size, with enhancement factors as large as an order of magnitude. We then show phononic crystals engineered inside nanomechanical trampolines, which results in additional reduction of the tensile stress and increased thermal isolation, resulting in further enhancement of the responsivity. Finally, defect-mode and band-gap tuning is shown by laser heating of the defect to the point where the fundamental defect mode completely leaves the band gap.

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“…Subsequent studies also confirmed this conclusion (Liu et al, 2018b;Nomura et al, 2018). Apart from silicon-based nanostrucutres, (Ma et al, 2018) reported a reduction of half thermal conductivity in nanopillared GNRs compared to pristine nanoribbons. It was also found that isotopic doping in nanopillars is conducive to phonon transport, because doping could weaken the hybridization degree.…”

Section: From the Perspective Of Phonon-wave Picturementioning

confidence: 71%

Thermal Transport in Two-Dimensional Heterostructures

2020

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Heterostructures based on two-dimensional (2D) materials have attracted intense attention in recent decades due to their unusual and tunable physics/chemical properties, which can be converted into promising engineering applications ranging from electronics, photonics, and phononics to energy recovery. A fundamental understanding of thermal transport in 2D heterostructures is crucial importance for developing micro-nano devices based on them. In this review, we summarized the recent advances of thermal transport in 2D heterostructures. Firstly, we introduced diverse theoretical approaches and experimental techniques for thermal transport in low-dimensional materials. Then we briefly reviewed the thermal properties of various 2D single-phase materials beyond graphene such as hexagonal boron nitride (h-BN), phosphorene, transition metal dichalcogenides (TMDs) and borophene, and emphatically discussed various influencing factors including structural defects, mechanical strain, and substrate interactions. Moreover, we highlighted thermal conduction control in tailored nanosystems—2D heterostructures and presented the associated underlying physical mechanisms, especially interface-modulated phonon dynamics. Finally, we outline their significant applications in advanced thermal management and thermoelectrics conversion, and discuss a number of open problems on thermal transport in 2D heterostructures.

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Unexpected thermal conductivity enhancement in pillared graphene nanoribbon with isotopic resonance

Cited by 89 publications

References 62 publications

Thermal conductivity of molybdenum disulfide nanotube from molecular dynamics simulations

Thermal conductivity of molybdenum disulfide nanotube from molecular dynamics simulations

Thermal Transport and Frequency Response of Localized Modes on Low-Stress Nanomechanical Silicon Nitride Drums Featuring a Phononic-Band-Gap Structure

Thermal Transport in Two-Dimensional Heterostructures

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