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 CNF@GNS 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.

受沉积岩结构的启发，我们通过堆叠石墨烯纳米片并将其浓缩成交替的导电层，展示了一种具有高导热率（TC）和出色的电磁干扰（EMI）屏蔽性能的柔性异质多层膜。通常，具有交替的纤维素纳米纤维（CNF）层和导电的CNF / GNS层的多层膜是通过交替真空过滤制造的。由于独特的珍珠母状取向结构和高浓度的导电填料，在获得的多层CNF @ GNS薄膜中可以形成高效的声子和电子传输路径。结果，只有25％（重量）GNS的最佳薄膜显示出33.55 W /（m·K）的高面内TC，与均匀的CNF / GNS薄膜相比，增加了144.6％。同时，