材料科学
电磁屏蔽
石墨烯
导电体
复合材料
堆积
纳米纤维
电磁干扰
电磁干扰
热导率
光电子学
电导率
纳米技术
核磁共振
电子工程
物理化学
化学
工程类
物理
作者
Liang Li,Zhiguo Ma,Penghui Xu,Bing Zhou,Qingtao Li,Jianmin Ma,Chengen He,Yuezhan Feng,Chuntai Liu
标识
DOI:10.1016/j.compositesa.2020.106134
摘要
Inspired by sedimentary rock structure, we demonstrate a flexible heterogeneous multilayered film with high thermal conductivity (TC) and excellent electromagnetic interference (EMI) shielding performance by stacking and concentrating graphene nanosheets (GNS) into alternating conductive layers. Typically, the multilayered film with alternating cellulose nanofiber (CNF) layers and conductive CNF/GNS layers was fabricated by alternating vacuum filtration. Arising from the unique nacre-like oriented structure and highly concentrated conductive filler, high-efficiency phonon and electron transmission paths can be formed in the obtained multilayered [email protected] film. As a result, the optimal film with only 25 wt% GNS reveal a high in-plane TC of 33.55 W/(m·K), which increases by 144.6% comparing to the homogeneous CNF/GNS film. Simultaneously, the multilayered films exhibit the effective EMI shielding performance with the highest shielding effectiveness (SE) of 27.4 dB, which is mainly attributed to the enhancing impedance matching and multiple microwave reflections induced by the unique alternating multilayer structure.
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