Flexible electromagnetic interference (EMI) shielding materials with excellent thermal conductivities and Joule heating performances are of urgent demand in the communication industry, artificial intelligence, and wearable electronics. In this work, highly conductive silver nanowires (AgNWs) were prepared using the polyol method. Cellulose sheets were then prepared by dissolving natural cotton in a green and efficient NaOH/urea aqueous solution. Finally, multifunctional flexible EMI shielding AgNWs/cellulose films were fabricated based on vacuum-assisted filtration and hot-pressing. AgNWs are evenly embedded in the inner cellulose matrix and overlap with each other to form a 3D network. AgNWs/cellulose films, with a thickness of 44.5 μm, obtain the superior EMI shielding effectiveness of 101 dB, which is the highest value ever reported for shielding materials with the same thickness. In addition, AgNWs/cellulose films present excellent tensile strength (60.7 MPa) and tensile modulus (3.35 GPa), ultrahigh electrical conductivity (σ, 5571 S/cm), and excellent in-plane thermal conductivity coefficient (λ_∥, 10.55 W/mK), which can effectively dissipate the heat accumulation. Interestingly, AgNWs/cellulose films also show outstanding Joule heating performances, good stability, and sensitive temperature response at driving voltages, absolutely safe for the human body. Therefore, our fabricated multifunctional flexible AgNWs/cellulose films have broad prospects in the fields of EMI shielding and protection of outdoor large-scale power transformers and wearable electronics.

中文翻译：

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具有出色热管理和焦耳加热性能的多功能柔性电磁干扰屏蔽银纳米线/纤维素膜

具有优异的导热性和焦耳加热性能的柔性电磁干扰（EMI）屏蔽材料在通信行业，人工智能和可穿戴电子产品中迫切需要。在这项工作中，使用多元醇方法制备了高导电性的银纳米线（AgNWs）。然后通过将天然棉溶于绿色高效的NaOH /尿素水溶液中来制备纤维素片。最后，在真空辅助过滤和热压的基础上，制备了多功能柔性EMI屏蔽AgNWs /纤维素膜。AgNWs均匀地嵌入内部纤维素基质中，并且彼此重叠以形成3D网络。AgNWs /纤维素膜的厚度为44.5μm，可获得101 dB的出色EMI屏蔽效果，对于相同厚度的屏蔽材料，这是有史以来的最高值。此外，AgNWs /纤维素膜还具有出色的拉伸强度（60.7 MPa）和拉伸模量（3.35 GPa），超高电导率（σ，5571 S / cm）和出色的面内导热系数（λ）_∥，10.55 W / mK），可以有效地散发热量。有趣的是，AgNWs /纤维素膜还显示出出色的焦耳加热性能，良好的稳定性和在驱动电压下的敏感温度响应，对人体绝对安全。因此，我们制造的多功能柔性AgNWs /纤维素膜在室外大型电力变压器和可穿戴电子设备的EMI屏蔽和保护领域具有广阔的前景。