Thermal conductivity enhancement of carbon@ carbon nanotube arrays and bonded carbon nanotube network
Artikel i vetenskaplig tidskrift, 2019

Carbon nanotubes (CNTs) are long considered as a promising material for thermal applications. However, problems such as low volume CNT fraction abhorrent to practical applications have been raising the demand for novel architecture of this material. Here we demonstrate two fabrication methods, in which a self-assembly method for fabricating covalent-bonded CNT network (3D CNT) and another method for covalent-bonded C to CNTs (C@CNT) network, and presented both as a potential method to enhance thermal conductivity of CNT arrays. We utilized pulsed photothermal reflectance technique and using new four-layer heat conduction model based on the transmission-line theory to measure thermal conductivity of the samples. The 3D CNT with thermal conductivity of 21 W mK(-1) and C@CNT with thermal conductivity of 26 W mK(-1) turn out to be an excellent candidate for thermal interface material as the thermal conductivity increased by 40% and 70% respectively as compared to conventional CNT arrays. The improvement is attributed to the efficient thermal routines constructed between CNTs and secondary CNTs in 3D CNT and between C layer and CNTs in C@CNT. The other factor to improve thermal conductivity of the samples is decreasing air volume fraction in CNT arrays. Our fabrication methods provide a simple method but effective way to fabricate 3D CNT and C@CNT and extend the possibility of CNTs towards TIM application.

thermal conductivity

CNT array

thermal interface materials

3D CNT network

Författare

Majid Kabiri Samani

Chalmers, Mikroteknologi och nanovetenskap (MC2), Elektronikmaterial och system

Congxiang Lu

Nanyang Technological University

Ningbo Cataglyphis Intelligent Technol Co Ltd

Kong Qinyu

Nanyang Technological University

Narjes Khosravian

Chalmers, Fysik, Material- och ytteori

George Chen

BC Photon Technol Co

Chong Wei Tan

Nanyang Technological University

Per Rudquist

Chalmers, Mikroteknologi och nanovetenskap (MC2), Elektronikmaterial och system

Beng Kang Tay

CNRS Int NTU THALES Res Alliance

Nanyang Technological University

Johan Liu

Chalmers, Mikroteknologi och nanovetenskap (MC2), Elektronikmaterial och system

Shanghai University

Materials Research Express

2053-1591 (eISSN)

Vol. 6 8 085616

Ämneskategorier

Keramteknik

Textil-, gummi- och polymermaterial

Materialkemi

DOI

10.1088/2053-1591/ab1e60

Mer information

Senast uppdaterat

2019-08-08