Enhancing Thermal Conductivity of Graphene Films Via Secondary Graphitization under a Direct Current Arc

Jiajie Zhang,Xianzhe Zeng,Peng He,Yunxia Ping,Guqiao Ding

ACS APPLIED ELECTRONIC MATERIALS（2024）

Shanghai Univ Engn Sci

Cited 0|Views9

Abstract

Thermally conductive graphene films (GFs) have been applied in the thermal management of electronic devices. Improving the thermal conductivity of GFs is critical for their applications in more systems based on high-power devices. However, traditional thermal treatment methods face great challenges in enhancing the performance of thermally conductive GFs. Herein, we applied direct current (DC) arc discharge for the secondary graphitization of GFs and investigated the enhancement in the thermal conductivity of thermally conductive GFs during the graphitization process at ultrahigh temperatures. The temperature of secondary graphitization was obtained via numerical simulations, and the effects of the atmosphere and reaction time on the thermal conductivity of thermally conductive GFs were explored to quantify the impact of these parameters on the thermal performance of GFs. The arc secondary graphitization process improved the structural order of thermally conductive GFs and reduced their defect density, thereby improving their thermal conductivity. Finally, a thermally conductive GF with a thickness of 100 +/- 10 mu m and a thermal conductivity of 1644 +/- 11 W/mK was prepared. This GF exhibited a 9.50% improvement in thermal conductivity compared to samples without arc treatment (1501 +/- 15 W/mK), exhibiting a superior performance compared with related reports. The thermal conductivity of the GF was enhanced within 2 min using the ultrahigh temperatures of >4000 K generated by arc discharge, which provides an approach for preparing high-performance thermal materials.

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Key words

graphene film,direct currentarc,numericalsimulation,secondary graphitization,thermal conductivity

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【要点】：本文提出了一种利用直流电弧对石墨烯膜进行二次石墨化以提高其热导率的新方法，实现了热导率的显著提升。

【方法】：通过直流电弧放电对石墨烯膜进行高温二次石墨化处理，优化其结构有序性并降低缺陷密度。

【实验】：实验中使用了直流电弧对石墨烯膜进行处理，通过改变气氛和反应时间来探究其对热导率的影响，最终制备出厚度为100±10μm，热导率为1644±11 W/mK的石墨烯膜，未经电弧处理的样品热导率为1501±15 W/mK，处理后的样品热导率提高了9.50%。