▎ 摘　　要

Flexible sensors are of great interests for future applications in the next-generation intelligent lifestyles. However, available fabrication methods exhibit shortages such as tedious preparation process and non environmentally friendly matrix, while the obtained sensors usually possess poor ability to discriminate stress from different directions. Here, we propose a highly sensitive aligned graphene/sodium alginate (SA) aerogel sensor with anisotropic properties fabricated through a facile unidirectional freezing method. The resulted orientated nanostructure combined with designed SA/Ca2+ network endows the aerogel with desired anisotropic properties and enhanced mechanical properties. The anisotropic performance data of resistance, strain sensitivity and compressive strength between the two directions reach up to 57, 3 and 1.5 times respectively. Moreover, the obtained sensors can be used in expression recognition and real-time health monitoring owing to the excellent sensitivity and desired anisotropic conductive response ability. This work is a step toward bio-based high-performance anisotropic strain sensors, which opens up new opportunities for the design and fabrication of advanced intelligent electronic devices for future lifestyles.