Abstract The team of Professor Gao Chao of Polymer University of Zhejiang University has developed a high thermal conductivity super-flexible graphene assembly film with a thermal conductivity close to 40% of the ideal single-layer graphene thermal conductivity. It can be folded 6,000 times and bent 100,000 times. It is expected to be applied in Electronic components thermal conduction, a new generation of flexible electronics...
The team of Professor Gao Chao of the Department of Polymer Science, Zhejiang University has developed a high thermal conductivity ultra-flexible graphene assembly film with a thermal conductivity close to 40% of the ideal single-layer graphene thermal conductivity. It can be folded 6,000 times and bent 100,000 times. It is expected to be applied to electronics. Component heat conduction, a new generation of flexible electronic devices and aerospace. This achievement was published in the journal Advanced Materials. According to Xinhua News Agency reported on June 6, in the existing macro materials, high thermal conductivity and high flexibility are a pair of contradictions, often difficult to have both. Although the emergence of graphene materials has provided theoretical possibilities for solving this contradiction, no research team has been able to achieve breakthroughs.
The superb team creatively proposed the "large pleats" material preparation method: firstly, a large piece of single-layer graphene overlaps each other. After high-temperature heat treatment, the oxygen-containing group in the material releases gas, and a micro-balloon is formed inside the material. The film is cooled and pressed with a mechanical roller to form a film, and the gas of the air bag is discharged to form micro wrinkles.
Under the action of external force, the micro-pleats on the graphene film will be elastically deformed, and the larger the external force, the more obvious the deformation. Experimental data shows that the elongation at break of graphene films is increased by two to three times compared to conventional graphite film materials.
The researchers introduced that the ductile micro-pleats are malleable, which can withstand repeated folding, knotting, twisting, bending, origami and other complex deformations, and is more suitable for industrial scale production.
The highly flexible graphene film also has excellent thermal conductivity. In fact, the thermal conductivity of the graphene film exceeds the thermal conductivity of the macroscopic materials currently on the market, with an average value of 1900 watts/meter·degree.
According to the researchers, the core components of electronic components have their own stable operating temperature range. In general, the temperature is increased by 8 ° C to 10 ° C, and the life of electronic devices will be reduced by half. In the experiment, the researchers replaced this commercial graphene film with a commercial graphite film and applied it to the heat sink film of the mobile phone. It was found that the temperature at the CPU of the mobile phone can be controlled below 33 ° C, which is 6 ° C lower than that of the commercial graphite film.
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