Issue

Vol. 16 (2024)

Regulatable Orthotropic 3D Hybrid Continuous Carbon Networks for Efficient Bi-Directional Thermal Conduction

https://doi.org/10.1007/s40820-024-01426-0
Huitao Yu
School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Tianjin University, Tianjin 300350, People’s Republic of China
Lianqiang Peng
School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Tianjin University, Tianjin 300350, People’s Republic of China
Can Chen
School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Tianjin University, Tianjin 300350, People’s Republic of China
Mengmeng Qin
School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Tianjin University, Tianjin 300350, People’s Republic of China
Wei Feng
School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Tianjin University, Tianjin 300350, People’s Republic of China

Corresponding Author: Wei Feng

weifeng@tju.edu.cn

Nano-Micro Letters, Vol. 16 (2024), Article Number: 198

Abstract

Vertically oriented carbon structures constructed from low-dimensional carbon materials are ideal frameworks for high-performance thermal interface materials (TIMs). However, improving the interfacial heat-transfer efficiency of vertically oriented carbon structures is a challenging task. Herein, an orthotropic three-dimensional (3D) hybrid carbon network (VSCG) is fabricated by depositing vertically aligned carbon nanotubes (VACNTs) on the surface of a horizontally oriented graphene film (HOGF). The interfacial interaction between the VACNTs and HOGF is then optimized through an annealing strategy. After regulating the orientation structure of the VACNTs and filling the VSCG with polydimethylsiloxane (PDMS), VSCG/PDMS composites with excellent 3D thermal conductive properties are obtained. The highest in-plane and through-plane thermal conductivities of the composites are 113.61 and 24.37 W m−1 K−1, respectively. The high contact area of HOGF and good compressibility of VACNTs imbue the VSCG/PDMS composite with low thermal resistance. In addition, the interfacial heat-transfer efficiency of VSCG/PDMS composite in the TIM performance was improved by 71.3% compared to that of a state-of-the-art thermal pad. This new structural design can potentially realize high-performance TIMs that meet the need for high thermal conductivity and low contact thermal resistance in interfacial heat-transfer processes.


Highlights:
1 A composite thermal interface material with three-dimensional hybrid carbon network-reinforced polydimethylsiloxane was proposed.
2 The cooperative regulation of thermal conductivity and mechanical properties was achieved by controlling the assembly process of micro-nano scale unit carbon materials.
3 The orthotropic continuous carbon structure endowed the composites with in-plane and out-of-plane thermal conductivities of up to 113.61 and 24.37 W m−1 K−1, respectively.
4 The excellent compressibility and adhesion properties cooperatively improved the effective thermal conductivity by more than an order of magnitude.

Keywords

Orthotropic continuous structures Hybrid carbon networks Carbon/polymer composites Thermal interface materials
Yu, Huitao, Lianqiang Peng, Can Chen, Mengmeng Qin, and Wei Feng. 2024. “Regulatable Orthotropic 3D Hybrid Continuous Carbon Networks for Efficient Bi-Directional Thermal Conduction”. Nano-Micro Letters 16 (May):198. https://doi.org/10.1007/s40820-024-01426-0.
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