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Fabrication of Three-Dimensional Graphene-Based Polyhedrons via Origami-Like Self-Folding
Published on: September 23, 2018
A three-dimensional vertically aligned functionalized multilayer graphene architecture: an approach for
Qizhen Liang1, Xuxia Yao, Wei Wang
1School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive, Atlanta, Georgia 30332, United States.
ACS Nano
|March 10, 2011
Summary
Aligned functionalized multilayer graphene sheets (fMGs) demonstrate exceptional thermal and electrical conductivity. A novel vertically aligned architecture significantly enhances thermal interfacial material performance for advanced thermal management applications.
Area of Science:
- Materials Science
- Nanotechnology
- Thermal Engineering
Background:
- Graphene's unique properties offer potential for advanced thermal management materials.
- Achieving efficient alignment and high performance in graphene-based materials remains a challenge.
- Developing effective thermal interfacial materials (TIMs) is crucial for electronic device cooling.
Purpose of the Study:
- To develop a scalable method for aligning functionalized multilayer graphene sheets (fMGs).
- To investigate the anisotropic properties of aligned fMGs.
- To construct and evaluate a novel three-dimensional vertically aligned fMG TIM architecture.
Main Methods:
- Large-scale alignment of fMGs using vacuum filtration at room temperature.
- Characterization of aligned fMGs using SEM and polarized Raman spectroscopy.
- Assembly of vertically aligned fMG TIMs between silicon surfaces with indium as a metallic medium.
Main Results:
- Achieved efficient, large-scale alignment of fMGs with observed strong property anisotropy.
- Obtained high in-plane electrical conductivity (386 S cm(-1)) and thermal conductivity (112 W m(-1) K(-1)) without reduction.
- Demonstrated significantly enhanced equivalent thermal conductivity (75.5 W m(-1) K(-1)) and lower contact thermal resistance (5.1 mm2 K W(-1)) for the VA-fMG TIM.
- Observed ultralow in-plane coefficient of thermal expansion (-0.71 ppm K(-1)).
Conclusions:
- Vacuum filtration provides an effective method for aligning fMGs, yielding materials with desirable anisotropic properties.
- The proposed 3D vertically aligned fMG TIM architecture significantly outperforms conventional TIMs.
- This work offers a promising approach for graphene-based TIMs and advances understanding of vertically aligned graphene structures for thermal management and other applications.
