Ye Xiaoai, Zhang Xu, Zhou Xinsheng, Wang Guigen
Guangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic Systems, School of Materials Science and Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China.
National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin 150080, China.
Nanomaterials (Basel). 2023 Sep 21;13(18):2608. doi: 10.3390/nano13182608.
Lightweight, flexible, and electrically conductive thin films with high electromagnetic interference (EMI) shielding effectiveness and excellent thermal management capability are ideal for portable and flexible electronic devices. Herein, the asymmetric and multilayered structure Ag-MXene/ANFs composite papers (AMAGM) were fabricated based on Ag-MXene hybrids and aramid nanofibers (ANFs) via a self-reduction and alternating vacuum-assisted filtration process. The resultant AMAGM composite papers exhibit high electrical conductivity of 248,120 S m, excellent mechanical properties with tensile strength of 124.21 MPa and fracture strain of 4.98%, superior EMI shielding effectiveness (62 dB), ultra-high EMI SE/t (11,923 dB cm g) and outstanding EMI SE reliability as high as 96.1% even after 5000 cycles of bending deformation benefiting from the unique structure and the 3D network at a thickness of 34 μm. Asymmetric structures play an important role in regulating reflection and absorption of electromagnetic waves. In addition, the multifunctional nanocomposite papers reveal outstanding thermal management performances such as ultrafast thermal response, high heating temperatures at low operation voltage, and high heating stability. The results indicate that the AMAGM composite papers have excellent potential for high-integration electromagnetic shielding, wearable electronics, artificial intelligence, and high-performance heating devices.
具有高电磁干扰（EMI）屏蔽效能和出色热管理能力的轻质、柔性且导电的薄膜对于便携式和柔性电子设备而言是理想之选。在此，基于银-碳化钛（Ag-MXene）杂化物和芳纶纳米纤维（ANFs），通过自还原和交替真空辅助过滤工艺制备了不对称多层结构的Ag-MXene/ANFs复合纸（AMAGM）。所得的AMAGM复合纸展现出248120 S m的高电导率、124.21 MPa的拉伸强度和4.98%的断裂应变的优异机械性能、卓越的EMI屏蔽效能（62 dB）、超高的EMI SE/t（11923 dB cm g）以及即使在34 μm厚度下经过5000次弯曲变形循环后仍高达96.1%的出色EMI SE可靠性，这得益于其独特结构和三维网络。不对称结构在调节电磁波的反射和吸收方面发挥着重要作用。此外，这种多功能纳米复合纸还展现出出色的热管理性能，如超快的热响应、低工作电压下的高加热温度以及高加热稳定性。结果表明，AMAGM复合纸在高集成电磁屏蔽、可穿戴电子设备、人工智能和高性能加热设备方面具有优异的潜力。
