Constructing carbon-based aerogels with mechanical flexibility and good conductivity remains a challenge. Herein, cellulose nanofibers (CNF) as the building block to prepare CNF-based carbon aerogels (CCAs) by the “Bottom to up” strategy, while the polypyrrole (PPy) was interfacially grown on the CCAs to obtain PPy-carbon aerogels composites (CCAs-P). The PPy was uniformly and firmly loaded onto the CCAs framework, leading to the CCAs-P with excellent mechanical properties. The compressive stress of CCAs-P was over 20 times higher than that of CCAs under 80% strain, and its compressive stress was up to 800 kPa. Meanwhile, the CCAs-P had a great sensitivity to weak signals (~ 69 ms) which was capable of accurately monitoring and recording the signals of varied human motions. This is because the interfacial growth process of PPy produces more conducting channels. This study may help to advance the use of carbon-based aerogels in flexible wearable sensing systems.

构建具有机械柔韧性和良好导电性的碳基气凝胶仍然是一个挑战。在此，以纤维素纳米纤维（CNF）为基石，通过“自下而上”的策略制备CNF基碳气凝胶（CCA），而聚吡咯（PPy）在CCA上界面生长得到PPy-碳气凝胶复合材料。 CCA-P)。PPy均匀且牢固地加载到CCA框架上，导致CCA-P具有优异的机械性能。CCA-P在80%应变下的压应力是CCA的20倍以上，其压应力高达800 kPa。同时，CCA-P对微弱信号（~69 ms）具有很高的灵敏度，能够准确地监测和记录各种人体运动的信号。这是因为 PPy 的界面生长过程产生了更多的导电通道。这项研究可能有助于推动碳基气凝胶在柔性可穿戴传感系统中的使用。