Zhang Peijuan, Hao Yuanyuan, Shi Hang, Lu Jiahao, Liu Yingjun, Ming Xin, Wang Ya, Fang Wenzhang, Xia Yuxing, Chen Yance, Li Peng, Wang Ziqiu, Su Qingyun, Lv Weidong, Zhou Ji, Zhang Ying, Lai Haiwen, Gao Weiwei, Xu Zhen, Gao Chao
MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Key Laboratory of Adsorption and Separation Materials and Technologies of Zhejiang Province, Zhejiang University, 38 Zheda Road, Hangzhou, 310027, People's Republic of China.
Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering, Taiyuan, 030032, People's Republic of China.
Nanomicro Lett. 2023 Dec 19;16(1):58. doi: 10.1007/s40820-023-01277-1.
Highly thermally conductive graphitic film (GF) materials have become a competitive solution for the thermal management of high-power electronic devices. However, their catastrophic structural failure under extreme alternating thermal/cold shock poses a significant challenge to reliability and safety. Here, we present the first investigation into the structural failure mechanism of GF during cyclic liquid nitrogen shocks (LNS), which reveals a bubbling process characterized by "permeation-diffusion-deformation" phenomenon. To overcome this long-standing structural weakness, a novel metal-nanoarmor strategy is proposed to construct a Cu-modified graphitic film (GF@Cu) with seamless heterointerface. This well-designed interface ensures superior structural stability for GF@Cu after hundreds of LNS cycles from 77 to 300 K. Moreover, GF@Cu maintains high thermal conductivity up to 1088 W m K with degradation of less than 5% even after 150 LNS cycles, superior to that of pure GF (50% degradation). Our work not only offers an opportunity to improve the robustness of graphitic films by the rational structural design but also facilitates the applications of thermally conductive carbon-based materials for future extreme thermal management in complex aerospace electronics.
高导热石墨薄膜（GF）材料已成为高功率电子设备热管理的一种具有竞争力的解决方案。然而，它们在极端交替热/冷冲击下的灾难性结构失效对可靠性和安全性构成了重大挑战。在此，我们首次对GF在循环液氮冲击（LNS）过程中的结构失效机制进行了研究，揭示了一个以“渗透 - 扩散 - 变形”现象为特征的起泡过程。为克服这一长期存在的结构弱点，我们提出了一种新颖的金属 - 纳米铠装策略，以构建具有无缝异质界面的铜改性石墨薄膜（GF@Cu）。这种精心设计的界面确保了GF@Cu在从77到300 K的数百次LNS循环后具有卓越的结构稳定性。此外，即使在150次LNS循环后，GF@Cu仍保持高达1088 W m⁻¹ K⁻¹的高导热率，降解率小于5%，优于纯GF（降解率50%）。我们的工作不仅为通过合理的结构设计提高石墨薄膜的稳健性提供了机会，还促进了导热碳基材料在未来复杂航空航天电子极端热管理中的应用。
