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Open AccessArticle

Thermally Reduced Graphene Oxide/Carbon Nanotube Composite Films for Thermal Packaging Applications

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Shanghai Key Laboratory of Intelligent Manufacturing and Robotics, School of Automation and Mechanical Engineering, Shanghai University, Shanghai 200444, China
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Sino-Sweden Microsystem Integration Technology (SMIT) Center, School of Automation and Mechanical Engineering, Shanghai University, Shanghai 201800, China
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Electronics Materials and Systems Laboratory, Department of Microtechnology and Nanoscience (MC2), Chalmers University of Technology, SE-412 96 Goteborg, Sweden
*
Author to whom correspondence should be addressed.
Materials 2020, 13(2), 317; https://doi.org/10.3390/ma13020317
Received: 11 December 2019 / Revised: 5 January 2020 / Accepted: 7 January 2020 / Published: 10 January 2020
(This article belongs to the Section Carbon Materials)
Thermally reduced graphene oxide/carbon nanotube (rGO/CNT) composite films were successfully prepared by a high-temperature annealing process. Their microstructure, thermal conductivity and mechanical properties were systematically studied at different annealing temperatures. As the annealing temperature increased, more oxygen-containing functional groups were removed from the composite film, and the percentage of graphene continuously increased. When the annealing temperature increased from 1100 to 1400 °C, the thermal conductivity of the composite film also continuously increased from 673.9 to 1052.1 W m−1 K−1. Additionally, the Young’s modulus was reduced by 63.6%, and the tensile strength was increased by 81.7%. In addition, the introduction of carbon nanotubes provided through-plane thermal conduction pathways for the composite films, which was beneficial for the improvement of their through-plane thermal conductivity. Furthermore, CNTs apparently improved the mechanical properties of rGO/CNT composite films. Compared with the rGO film, 1 wt% CNTs reduced the Young’s modulus by 93.3% and increased the tensile strength of the rGO/CNT composite film by 60.3%, which could greatly improve its flexibility. Therefore, the rGO/CNT composite films show great potential for application as thermal interface materials (TIMs) due to their high in-plane thermal conductivity and good mechanical properties. View Full-Text
Keywords: graphene; carbon nanotubes; composite film; thermal interface materials graphene; carbon nanotubes; composite film; thermal interface materials
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MDPI and ACS Style

Yuan, G.-J.; Xie, J.-F.; Li, H.-H.; Shan, B.; Zhang, X.-X.; Liu, J.; Li, L.; Tian, Y.-Z. Thermally Reduced Graphene Oxide/Carbon Nanotube Composite Films for Thermal Packaging Applications. Materials 2020, 13, 317.

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