Fast and highly anisotropic thermal transport through vertically aligned carbon nanotube arrays

Ivanov, Ilia N.; Puretzky, Alexander A.; Eres, Gyula; Wang, Hsin; Pan, Zhengwei; Cui, Hongtao; Jin, Rongying; Howe, Jane Y.; Geohegan, David B.

doi:10.1063/1.2397008

Cited by 165 publications

(106 citation statements)

References 21 publications

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“…[15][16][17][18][19][20][21][22][23] The value obtained here is higher than the largest reported value of 250 W m À1 K À1 . 20) This result attests to the higher density of CNT structures obtained by STEP growth than of other structures that have been reported.…”

contrasting

confidence: 50%

Long Length, High-Density Carbon Nanotube Film Grown by Slope Control of Temperature Profile for Applications in Heat Dissipation

Kawabata

Murakami

Nihei

et al. 2013

Jpn. J. Appl. Phys.

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We have developed a new growth method for a film of dense, vertically aligned carbon nanotubes (CNTs). We varied the slope of the growth temperature profile between 450 and 800 °C. By using the method with an Fe/Ti catalyst, the filling factor of the CNT film was measured to be 0.28, which is 20 times denser than that in the case where conventional CVD growth is utilized. We name this growth method the slope control of temperature profile (STEP) growth. Another feature of CNT films obtained by STEP growth is their mirror like surfaces. This allows for the measurement of the thermal conductivity by a pulse optical heating thermoreflectance method. The maximum thermal conductivity of the STEP-grown CNT film was 260 W m-1 K-1, which is higher than those of a solder and Si. This result suggests that STEP-grown CNT films are effective heat dissipation materials and can be used as thermal interface material (TIM) and thermal through silicon via (TSV).

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contrasting

confidence: 50%

Long Length, High-Density Carbon Nanotube Film Grown by Slope Control of Temperature Profile for Applications in Heat Dissipation

Kawabata

Murakami

Nihei

et al. 2013

Jpn. J. Appl. Phys.

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“…It is indicated by Ivanov et al [3] that a high temperature treatment (2.800°C) significantly increases the thermal properties of a carbon nanotube array. In a similar way there are indications from literature that a heat treatment in CNTs has a positive effect on their thermal properties.…”

Section: Challenge No1: Selection Of Raw Materials and Their Charactmentioning

confidence: 99%

Potential and challenges of metal-matrix-composites reinforced with carbon nanofibers and carbon nanotubes

Neubauer¹,

Kitzmantel²,

Hulman³

et al. 2010

Composites Science and Technology

185

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To cite this version:E. Neubauer, M. Kitzmantel, M. Hulman, P. Angerer. Potential and challenges of metal-matrixcomposites reinforced with carbon nanofibers and carbon nanotubes. Composites Science and Technology, Elsevier, 2010, 70 (16) This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractWith a continuous improvement of the production techniques for carbon nanofibers and carbon nanotubes along with an improvement of the available qualities of the materials, these reinforcements have been introduced into polymers, ceramics and metals. While in the field of polymers first success stories have been published on carbon nanofiller reinforcements, up to now metals containing these types of nanofillers are still a topic of intensive research. Basically a similar situation were found in those days, when micron sized carbon fibers came on the market. Today many applications of carbon fiber reinforced composites are existing, while metals reinforced with conventional carbon fibers are still only found in niche applications.Several reasons can be identified, why the introduction of carbon based nanofillers (nanofibers/nanotubes) into metallic matrices is a difficult task. Nevertheless it is worthwhile to carry out systematic studies in this field due to the excellent and promising thermal, electrical, mechanical or tribological properties of the nanofillers.This paper gives an overview and summarises the activities related to carbon nanotubes and nanofibers used as a reinforcement in metallic matrix materials. The main challenges and the potential with respect to material properties will be discussed. 1) IntroductionWithin the past years there was a significant increase on publications related to carbon nanofiber (CNF) and carbon nanotube (CNT) reinforced composites. Most of these publications are related to polymer based composites. Up to now there has been a limited number of publications and especially of success stories, where CNTs or CNFs have been successfully introduced in metallic or ceramic matrix materials resulting in significant improvements of the properties of the matrix material. This situation is similar to those several decades ago, when micron sized carbon fibers were already used in commercial applications in polymers while the successful introduction of carbon fibers in metal matrix composites took several additional years before showing first success. The reason why polymer based matrix composites resulted in a faster success compared to metal based ones, is of course related to the fact that a polymer matrix is in general characterised by a rather poor thermal, mechanical, electrical or...

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“…Despite the high intrinsic thermal conductivity of individual CNTs, the values of the effective conductivity reported for CNT-based materials are often relatively * corresponding author: lz2n@virginia.edu low and exhibit large variability [44][45][46][47][48][49][50][51]. The weak thermal coupling between the CNTs, defined by non-bonding van der Waals interactions, is commonly assumed to be the limiting factor that controls the thermal transport in the CNT materials [51][52][53][54][55][56][57][58].…”

Section: Introductionmentioning

confidence: 99%

Thermal conductance of carbon nanotube contacts: Molecular dynamics simulations and general description of the contact conductance

Salaway

Zhigilei

2016

Phys. Rev. B

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The contact conductance of carbon nanotube (CNT) junctions is the key factor that controls the collective heat transfer through CNT networks or CNT-based materials. An improved understanding of the dependence of the inter-tube conductance on the contact structure and local environment is needed for predictive computational modeling or theoretical description of the effective thermal conductivity of CNT materials. To investigate the effect of local structure on the thermal conductance across CNT-CNT contact regions, non-equilibrium molecular dynamics (MD) simulations are performed for different inter-tube contact configurations (parallel fully or partially overlapping CNTs and CNTs crossing each other at different angles) and local structural environments characteristic of CNT network materials. The results of MD simulations predict a stronger CNT length dependence present over a broader range of lengths than has been previously reported and suggest that the effect of neighboring junctions on the conductance of CNT-CNT junctions is weak and only present when the CNTs that make up the junctions are within the range of direct van der Waals interaction with each other. A detailed analysis of the results obtained for a diverse range of inter-tube contact configurations reveals a non-linear dependence of the conductance on the contact area (or number of interatomic inter-tube interactions) and suggests larger contributions to the conductance from areas of the contact where the density of interatomic inter-tube interactions is smaller. An empirical relation accounting for these observations and expressing the conductance of an arbitrary contact configuration through the total number of interatomic inter-tube interactions and the average number of interatomic inter-tube interactions per atom in the contact region is proposed. The empirical relation is found to provide a good quantitative description of the contact conductance for various CNT configurations investigated in the MD simulations and is suitable for incorporation into mesoscopic models capable of predicting the effective thermal transport properties of CNT materials.

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Fast and highly anisotropic thermal transport through vertically aligned carbon nanotube arrays

Cited by 165 publications

References 21 publications

Long Length, High-Density Carbon Nanotube Film Grown by Slope Control of Temperature Profile for Applications in Heat Dissipation

Long Length, High-Density Carbon Nanotube Film Grown by Slope Control of Temperature Profile for Applications in Heat Dissipation

Potential and challenges of metal-matrix-composites reinforced with carbon nanofibers and carbon nanotubes

Thermal conductance of carbon nanotube contacts: Molecular dynamics simulations and general description of the contact conductance

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