Here, a highly flexible and anisotropic strain sensor based on sustainable biomass‐derived materials is fabricated through a facile, low‐cost, and scalable approach. The commercially available crepe paper made of the abundant and renewable cellulose is converted into a conductive network by carbonization. The fabricated strain sensor based on this carbonized crepe paper (CCP) exhibits high flexibility, fast response time (<115 ms), high durability (>10 000 cycles), and negligible hysteresis. Especially, the CCP strain sensor shows dramatically different gauge factors (10.10 and 0.14, respectively) between tensile bending perpendicular and parallel to the fibers direction. This anisotropic sensing performance is inherited from the crepe paper's unique anisotropic structure, i.e., aligned cellulose fibers and a corrugated surface, which is well maintained in the CCP. In addition, the CCP strain sensors' practical use in detecting complex human motions and controlling a 2‐degree‐of‐freedom machine is demonstrated, indicating their potential applications in multidimensional wearable electronics and smart robots.

中文翻译：

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基于碳化皱纹纸和对齐纤维素纤维的柔性各向异性应变传感器

在这里，通过一种简便，低成本和可扩展的方法制造了一种基于可持续生物质衍生材料的高度灵活且各向异性的应变传感器。由丰富的可再生纤维素制成的市售皱纹纸通过碳化转化为导电网络。基于这种碳化皱纹纸（CCP）制成的应变传感器具有高灵活性，快速响应时间（<115 ms），高耐用性（> 10000次循环）和可忽略的滞后性。特别是，CCP应变传感器在垂直于纤维方向和平行于纤维方向的拉伸弯曲之间显示出截然不同的应变系数（分别为10.10和0.14）。这种各向异性的感应性能是从皱纹纸独特的各向异性结构继承的，即，对齐的纤维素纤维和波纹状表面，在CCP中维护得很好。此外，还展示了CCP应变传感器在检测复杂的人体运动和控制2自由度机器中的实际应用，表明了它们在多维可穿戴电子设备和智能机器人中的潜在应用。