Silkworm‐Shaped MoS2 Growing on Graphene Foam for Highly Sensitive and Flexible Strain Sensor with Full‐Scale Human Motion Detection Ability

Abstract

AbstractHigh‐performance piezoresistive strain sensors (PSS) are important components of wearable electronics for human health management and are considered a key technology for future applications in fields such as artificial intelligence and human medical monitoring. Recently, many PSS have been developed based on a variety of electrosensitive materials. Among them, 3D graphene foams (GrF) have attracted significant attention owing to their excellent thermal conductivity, tensile properties, and light weight. Herein, a novel GrF‐based composite is developed by growing 2D molybdenum disulfide (MoS2) nanosheets directly. Many lathy nanosheets stand vertically on the GrF, similar to silkworms creeping on the leaf, making the composite more sensitive to mechanical deformation stimuli. The obtained MoS2@GrF composite is processed into PSS with a wide sensing range (0%–80%), high gauge factor values (16 below 1% and 39 over 40%), detection limit of 0.1% strain with 106/123 ms response/recovery time, and good cyclic stability (≥3000 cycles). Moreover, the as‐fabricated strain sensors exhibit excellent Joule heating performance, which can be adjusted by strain. As such, the PSS allows for full‐range body motion monitoring and thermal management, which has great potential for next‐generation smart wearable electronics.