Exploitation of cotton fabric as electromagnetic interference (EMI) shielding substrates have attracted a growing interest due to their desirable low carbon footprint, economic feasibility, and sustainability. Herein, a facile strategy was proposed for preparing a cellulose-based multifunctional PNIPAAm/PPy hydrogel/cotton (PPHC) EMI shielding composites with simultaneous high-efficient electro-photo-thermal conversion and comfort regulation functions. The PPHC was fabricated via in situ polymerization conductive PPy hydrogel on cotton substrate followed by deposition of PNIPAAm. Benefiting from the unique interconnected three-dimensional networked conductive structure of PPy hydrogel, the obtained PPHC composites exhibited high conductivity (15 mS/cm), and EMI shielding effectiveness (EMI SE ~ 40 dB) in the frequency of 8.2–12.3 GHz. Moreover, the PNIPAAm coating endowed the composite fabrics with adjustable wettability performance in response to external temperature, leading to excellent comfort regulation performance. This work provided feasible avenue toward low cost and sustainability cotton-based EMI shielding composites with efficient EMI shielding and comfort regulation performance.

Graphical abstract

中文翻译：

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用于 EMI 屏蔽的纤维素基多功能高导电 PNIPAAm/PPy 水凝胶/棉复合材料的进展

棉织物作为电磁干扰 (EMI) 屏蔽基材的开发由于其理想的低碳足迹、经济可行性和可持续性而引起了越来越多的兴趣。在此，提出了一种简便的策略来制备具有同时高效电-光-热转换和舒适度调节功能的纤维素基多功能 PNIPAAm/PPy 水凝胶/棉 (PPHC) EMI 屏蔽复合材料。PPHC 是通过在棉基材上原位聚合导电 PPy 水凝胶然后沉积 PNIPAAm 制成的。受益于 PPy 水凝胶独特的互连三维网络导电结构，所获得的 PPHC 复合材料在 8.2-12.3 GHz 的频率下表现出高电导率（15 mS/cm）和 EMI 屏蔽效果（EMI SE ~ 40 dB）。而且，PNIPAAm涂层赋予复合织物响应外部温度可调节的润湿性能，从而带来出色的舒适调节性能。这项工作为具有高效 EMI 屏蔽和舒适调节性能的低成本和可持续性棉基 EMI 屏蔽复合材料提供了可行的途径。

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