Negative Thermophoresis in Concentric Carbon Nanotube Nanodevices

Leng, Jiantao; Guo, Zhengrong; Hong-wei, Zhang; Chang, Tienchong; Guo, Xingming; Gao, Huajian

doi:10.1021/acs.nanolett.6b02815

Cited by 35 publications

(26 citation statements)

References 56 publications

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“…This was later confirmed by a scanning electron microscopy experiment [6]. MD remains the state-of-the-art method to explore molecular transport at nanoscale numerically [9,17].…”

Section: Introductionmentioning

confidence: 87%

Selective Conduction of Organic Molecules via Free-Standing Graphene

Wang

2019

J. Phys. Chem. C

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A race is held between ten species of organic gas molecules on a graphene substrate driven by thermal gradients via molecular dynamics. Fast conduction of the molecules is observed with selectivity for aromatic compounds. This selectivity stems from the fact that the planar structure of the aromatic molecule helps keep a shorter distance to the substrate, which is the key to the driving force at the gas-solid interface. The drift velocity monotonically increases with decreasing molecule density, with no ballistic transport observable even for a single molecule. A non-linear regime is discovered for the conduction of benzene molecules under large thermal gradients. At low temperature, molecules formed aggregation and move collectively along specific path in the graphene substrate.

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“…This was later confirmed by a scanning electron microscopy experiment [6]. MD remains the state-of-the-art method to explore molecular transport at nanoscale numerically [9,17].…”

Section: Introductionmentioning

confidence: 87%

Selective Conduction of Organic Molecules via Free-Standing Graphene

Wang

2019

J. Phys. Chem. C

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“…Six years later, carbon nanotubes (CNTs) were pioneered by Sumio Iijima [2]. One-dimensional (1D) materials have historically been one of the most extensively studied classes of materials due to their diverse physical and chemical properties [3][4][5][6][7][8][9][10][11][12][13][14]. The breakthrough of single-layer graphene [15], initialized by Konstantin Novoselov and Andre Geim in 2004, has triggered exceptional interest in two-dimensional (2D) materials in the form of a single-atom-thick or polyhedral-thick layer with either covalent or ionic bonding in the plane and van der Waals bonding out of plane [16][17][18][19][20][21][22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Mechanical testing of two-dimensional materials: a brief review

Al-Quraishi

Kauppila

et al. 2020

International Journal of Smart and Nano Materials

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Two-dimensional (2D) materials have dominated nanoscience for the last two decades. Among all 2D materials, graphene, MoS 2 , and h-BN are extremely popular and have been tentatively scaled up to fabricate nanocomposites, energy storage devices, flexible electronics, etc., ex situ and in situ mechanical characterization of 2D crystals can help us understand their mechanical behavior and measure their mechanical properties, which are of great significance in both fundamental science and practical engineering. To date, a great effort has been devoted to both theoretical and experimental mechanics with a focus on unveiling mechanical behaviors and quantifying mechanical properties. Beyond original research, several insightful review works have been published with a specific focus on the mechanics of 2D materials. To have a complementary contribution to the overview of the mechanics of 2D materials, we would like to review the developed experimental techniques being used to mechanically characterize 2D materials. The working mechanism and associated advantages and disadvantages of the techniques will be briefly discussed. Based on the existence of arguments in mechanical properties and behaviors of 2D crystals, and immature mechanical characterization of 2D materials, more intensive and comprehensive studies are expected toward a full understanding of these novel and promising materials.

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“…However, there is to date a lack of knowledge of the anisotropic thermal properties of MWCNTs, despite its significant importance in developing nanoscale thermal devices. 23 Based on molecular dynamics (MD) simulations, here we investigate the thermal conducting properties of double-walled carbon nanotubes (DWCNTs). It is found that DWCNTs may have an extremely high anisotropic thermal conductivity ratio, 5 times higher than that of bilayer graphene sheet and two orders higher than that of graphite, indicating DWCNTs can be a tremendously important thermal management materials for high performance applications.…”

Section: Introductionmentioning

confidence: 99%

Extremely high thermal conductivity anisotropy of double-walled carbon nanotubes

Guo

Zhang

et al. 2017

AIP Advances

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Based on molecular dynamics simulations, we reveal that double-walled carbon nanotubes can possess an extremely high anisotropy ratio of radial to axial thermal conductivities. The mechanism is basically the same as that for the high thermal conductivity anisotropy of graphene layers - the in-plane strong sp2 bonds lead to a very high intralayer thermal conductivity while the weak van der Waals interactions to a very low interlayer thermal conductivity. However, different from flat graphene layers, the tubular structures of carbon nanotubes result in a diameter dependent thermal conductivity. The smaller the diameter, the larger the axial thermal conductivity but the smaller the radial thermal conductivity. As a result, a DWCNT with a small diameter may have an anisotropy ratio of thermal conductivity significantly higher than that for graphene layers. The extremely high thermal conductivity anisotropy allows DWCNTs to be a promising candidate for thermal management materials.

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Negative Thermophoresis in Concentric Carbon Nanotube Nanodevices

Cited by 35 publications

References 56 publications

Selective Conduction of Organic Molecules via Free-Standing Graphene

Selective Conduction of Organic Molecules via Free-Standing Graphene

Mechanical testing of two-dimensional materials: a brief review

Extremely high thermal conductivity anisotropy of double-walled carbon nanotubes

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