Abstract：
Miniaturization of modern micro-electronic devices urges the development of multi-functional thermal management materials. Traditional polymer composite-based thermal management materials are promising candidates, but they suffer from single functionality, high cost, and low fire-resistance. Herein, a multifunctional liquid metal (LM)-bridged graphite nanoplatelets (GNPs)/ aramid nanofibers (ANFs) film is fabricated via a facile vacuum-assisted self-assembly approach followed by compression. ANFs serve as interfacial binders to link LM and GNPs together via hydrogen bondings and π-π interactions, while LM bridges the adjacent layer of GNPs to endow a fast thermal transport by phonons and electrons. The resultant composite films exhibit a high bidirectional thermal conductivity (In-plane: 29.5 W m-1K-1 and through-plane: 5.3 W m-1K-1), offering a reliable and effective cooling. Moreover, the as-fabricated composite films exhibit superior flame-retardance (peak of heat release rate of 4000J g-1), outstanding Joule heating performance (200 °C at supplied voltage of 3.5 V), and excellent electromagnetic interference shielding effectiveness (EMI SE of 62 dB). This work provides an efficient avenue to fabricate multifuntional thermal management materials for micro-electronic devices, battery thermal management, and artificial intelligence.
摘要：
现代微电子器件的小型化促使多功能热管理材料的发展。传统的基于聚合物复合材料的热管理材料是有前途的候选材料，但是它们的功能单一，高成本,和低耐火性。在这里，一种多功能液态金属(LM)桥接的石墨纳米片(GNP)/芳族聚酰胺纳米纤维(ANF)膜通过简单的真空辅助自组装方法然后压缩来制造。ANF用作界面粘合剂，通过氢键和π-π相互作用将LM和GNP连接在一起，而LM桥接相邻的GNP层，以赋予声子和电子的快速热传输。所得复合膜表现出高的双向热导率（面内：29.5Wm-1K-1和通过面：5.3Wm-1K-1），提供可靠和有效的冷却。此外，所制备的复合薄膜表现出优异的阻燃性（放热速率峰值为4000Jg-1），出色的焦耳加热性能（在3.5V的供电电压下200°C），和优良的电磁干扰屏蔽效能（EMISE为62dB）。这项工作为制造用于微电子器件的多功能热管理材料提供了有效的途径，电池热管理，和人工智能。
