Thermal conductivity characterization of three dimensional carbon nanotube network using freestanding sensor-based 3ω technique

A novel three-dimensional (3D) carbon nanotube (CNT) network, composed of vertically aligned CNT array (primary CNT) bridged with randomly oriented secondary CNT, is synthesized in this work. We report the first data for the thermal properties of this new structure using freestanding sensor-based 3ω...

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Main Authors: Kong, Qinyu, Qiu, Lin, Lim, Yu Dian, Tan, Chong Wei, Liang, Kun, Lu, Congxiang, Tay, Beng Kang
Other Authors: School of Electrical and Electronic Engineering
Format: Article
Language:English
Published: 2020
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Online Access:https://hdl.handle.net/10356/142324
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1423242020-06-19T03:57:33Z Thermal conductivity characterization of three dimensional carbon nanotube network using freestanding sensor-based 3ω technique Kong, Qinyu Qiu, Lin Lim, Yu Dian Tan, Chong Wei Liang, Kun Lu, Congxiang Tay, Beng Kang School of Electrical and Electronic Engineering Center for Micro/Nano-electronics Research Techno Plaza Engineering::Electrical and electronic engineering Thermal Conductivity Carbon Nanotube Network A novel three-dimensional (3D) carbon nanotube (CNT) network, composed of vertically aligned CNT array (primary CNT) bridged with randomly oriented secondary CNT, is synthesized in this work. We report the first data for the thermal properties of this new structure using freestanding sensor-based 3ω technique. Introducing freestanding sensor to conventional 3ω system enables the nondestructive characterization for samples with rough surfaces. The thermal conductivities of CNT films, as well as the contact resistance between the sensor and sample surfaces, are extracted numerically by a finite-element thermal model. The thermal conductivities of 3D CNT network under different array densities range from 9.3 to 19.8 W/mK. It is found that at lower CNT array density of 5.6 × 108/cm2, the growth of secondary CNT enhances the thermal conductivity of primary CNT array by 55.9%. This significant improvement in thermal conductivity can be attributed to the additional thermal pathway provided by the secondary CNTs in the primary CNT forest. However as the density of primary CNT array increases beyond 7.2 × 108/cm2, the growth of secondary CNTs on primary CNT forest reduces its thermal conductivity. This reduction in thermal conductivity can possibly be caused by the excessive thermal resistance from the CNT-CNT connection points within 3D CNT network. MOE (Min. of Education, S’pore) 2020-06-19T03:57:33Z 2020-06-19T03:57:33Z 2018 Journal Article Kong, Q., Qiu, L., Lim, Y. D., Tan, C. W., Liang, K., Lu, C., & Tay, B. K. (2018). Thermal conductivity characterization of three dimensional carbon nanotube network using freestanding sensor-based 3ω technique. Surface and Coatings Technology, 345, 105-112. doi:10.1016/j.surfcoat.2018.03.090 0257-8972 https://hdl.handle.net/10356/142324 10.1016/j.surfcoat.2018.03.090 2-s2.0-85045248561 345 105 112 en Surface and Coatings Technology © 2018 Elsevier B.V. All rights reserved.
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic Engineering::Electrical and electronic engineering
Thermal Conductivity
Carbon Nanotube Network
spellingShingle Engineering::Electrical and electronic engineering
Thermal Conductivity
Carbon Nanotube Network
Kong, Qinyu
Qiu, Lin
Lim, Yu Dian
Tan, Chong Wei
Liang, Kun
Lu, Congxiang
Tay, Beng Kang
Thermal conductivity characterization of three dimensional carbon nanotube network using freestanding sensor-based 3ω technique
description A novel three-dimensional (3D) carbon nanotube (CNT) network, composed of vertically aligned CNT array (primary CNT) bridged with randomly oriented secondary CNT, is synthesized in this work. We report the first data for the thermal properties of this new structure using freestanding sensor-based 3ω technique. Introducing freestanding sensor to conventional 3ω system enables the nondestructive characterization for samples with rough surfaces. The thermal conductivities of CNT films, as well as the contact resistance between the sensor and sample surfaces, are extracted numerically by a finite-element thermal model. The thermal conductivities of 3D CNT network under different array densities range from 9.3 to 19.8 W/mK. It is found that at lower CNT array density of 5.6 × 108/cm2, the growth of secondary CNT enhances the thermal conductivity of primary CNT array by 55.9%. This significant improvement in thermal conductivity can be attributed to the additional thermal pathway provided by the secondary CNTs in the primary CNT forest. However as the density of primary CNT array increases beyond 7.2 × 108/cm2, the growth of secondary CNTs on primary CNT forest reduces its thermal conductivity. This reduction in thermal conductivity can possibly be caused by the excessive thermal resistance from the CNT-CNT connection points within 3D CNT network.
author2 School of Electrical and Electronic Engineering
author_facet School of Electrical and Electronic Engineering
Kong, Qinyu
Qiu, Lin
Lim, Yu Dian
Tan, Chong Wei
Liang, Kun
Lu, Congxiang
Tay, Beng Kang
format Article
author Kong, Qinyu
Qiu, Lin
Lim, Yu Dian
Tan, Chong Wei
Liang, Kun
Lu, Congxiang
Tay, Beng Kang
author_sort Kong, Qinyu
title Thermal conductivity characterization of three dimensional carbon nanotube network using freestanding sensor-based 3ω technique
title_short Thermal conductivity characterization of three dimensional carbon nanotube network using freestanding sensor-based 3ω technique
title_full Thermal conductivity characterization of three dimensional carbon nanotube network using freestanding sensor-based 3ω technique
title_fullStr Thermal conductivity characterization of three dimensional carbon nanotube network using freestanding sensor-based 3ω technique
title_full_unstemmed Thermal conductivity characterization of three dimensional carbon nanotube network using freestanding sensor-based 3ω technique
title_sort thermal conductivity characterization of three dimensional carbon nanotube network using freestanding sensor-based 3ω technique
publishDate 2020
url https://hdl.handle.net/10356/142324
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