Hui Zhao, Jin Yun, Yali Zhang, Kunpeng Ruan, Yinsen Huang, Yaping Zheng, Lixin Chen* and Junwei Gu*. Pressure-Induced Self-Interlocked Structures for Expanded Graphite Composite Papers Achieving Prominent EMI Shielding Effectiveness and Outstanding Thermal Conductivities. ACS Applied Materials & Interfaces, 2022, 10.1021/acsami.1c22950. 2020IF=9.229.（1區(qū)材料科學(xué)Top期刊）
https://pubs.acs.org/doi/abs/10.1021/acsami.1c22950
Abstract
High-performance films via layer-by-layer assembly of two-dimensional (2D) materials would provide all possibilities for the development of modern integrated electronics. However, the stacked structure between nanosheets and large-scale fabrication still remain a great challenge. Herein, the Fe3O4/expanded graphite (EG) papers are fabricated via in situ oxidation of ferrocene onto EG nanosheets, followed by a continuous roll-in process. Upon mechanical compaction, the self-interlocked structures driven by close overlapping and hooking of nanosheets in Fe3O4/EG (FG) composites remarkably facilitate the construction of phonon and electron transmission channels and improve mechanical strength. FG papers exhibit prominent shielding effectiveness (67.1 dB at ~100 μm) with enhanced absorptivity (~0.1, surpassing lots of conductive film materials), stemming from the synergistic effect of electrical and magnetic properties. Also, the electromagnetic interference (EMI) shielding performance shows prominent reliability after bending (2000 cycles) and ultrasonic treatment (30 min). The corresponding tensile strength reaches 35.8 MPa; meanwhile, the corresponding in-plane thermal conductivity coefficient is as high as 191.7 W/(m·K), which can rapidly and efficiently accelerate heat dissipation. In particular, FG papers also reveal rapid-response, controllable and highly stable Joule heating performance, and present promising prospects in the fields of radiation-proof clothing, flexible heaters, portable wearable devices, and aerospace.
二維（2D）材料逐層自組裝工藝制備的高性能薄膜將為現(xiàn)代集成電子產(chǎn)品的發(fā)展提供一切可能。然而，納米片之間的堆疊結(jié)構(gòu)和大規(guī)模制造仍然是一個(gè)巨大的挑戰(zhàn)。因此，本文通過二茂鐵在膨脹石墨（EG）納米片上的原位氧化和連續(xù)輥壓技術(shù)制備Fe3O4/EG復(fù)合紙。在機(jī)械壓力的作用下，F(xiàn)e3O4/EG（FG）復(fù)合材料中納米片間緊密重疊和相互勾連產(chǎn)生了自連鎖結(jié)構(gòu)，不僅有利于聲子和電子傳輸通道的構(gòu)建且提高了機(jī)械強(qiáng)度。FG復(fù)合紙表現(xiàn)出優(yōu)異的電磁屏蔽性能（厚度100 μm時(shí)，屏蔽效能為67.1 dB），以及高的電磁波吸收率（~0.1，超過大多數(shù)導(dǎo)電薄膜材料）。此外，經(jīng)2000次彎曲循環(huán)和30 min超聲處理后，F(xiàn)G復(fù)合紙的電磁屏蔽性能表現(xiàn)出優(yōu)異的穩(wěn)定性能。FG復(fù)合紙的拉伸強(qiáng)度達(dá)到35.8 MPa；同時(shí)，F(xiàn)G復(fù)合紙的面內(nèi)導(dǎo)熱系數(shù)高達(dá)191.7 W/(m·K)，可快速高效地散熱。特別是，F(xiàn)G復(fù)合紙還具有快速響應(yīng)、可控和高度穩(wěn)定的焦耳熱性能，在防輻射服、柔性加熱器、便攜式可穿戴設(shè)備和航空航天等領(lǐng)域具有廣闊的應(yīng)用前景。