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Achieving Ultra-High Heat Flux Transfer in Graphene Films via Tunable Gas Escape Channels
Haolong Zheng1,2, Peng He1,2, Shujing Yang1,2
1State Key Laboratory of Materials for Integrated Circuits, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai, 200050, P. R. China.
Researchers developed thick graphene films for advanced thermal management. These films maintain high thermal conductivity, enabling efficient heat dissipation in high-power electronic devices.
Area of Science:
- Materials Science
- Nanotechnology
- Thermal Engineering
Background:
- Graphene films offer high thermal conductivity for electronic thermal management.
- Increasing power density in electronics demands enhanced heat flux carrying capacity.
- Existing graphene films face a trade-off between thickness and thermal conductivity.
Purpose of the Study:
- Investigate pore structure evolution during graphene film assembly.
- Develop methods to prepare thick graphene films with high thermal conductivity.
- Enhance heat flux carrying capacity for advanced thermal management.
Main Methods:
- Utilized humidification treatment and freeze-drying of graphene oxide (GO) films.
- Pre-constructed ordered flat pore structures to facilitate gas escape.
- Optimized microstructure for reduced defects and increased grain size.
Main Results:
- Achieved ultra-high thermal conductivity of 1781 W m-1 K-1.
- Prepared graphene films exceeding 100 µm in thickness.
- Demonstrated exceptional heat dissipation at high heat flux densities (≈2000 W cm-2).
Conclusions:
- Constructing gas escape channels is key to preparing thick, high-performance graphene films.
- Optimized graphene films exhibit superior thermal management capabilities.
- Findings provide guidance for thermal management in high-power electronic devices.
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