biostudies-literatureZhao WChina Postdoctoral Science FoundationJiangnan University250-257https://www.ebi.ac.uk/biostudies/studies/S-EPMC9417151biostudies-literatureUnknown4(1)Wearable sensors have gained considerable popularity due to the potential feasibility in flexible electronics. In this work, a facile fabrication strategy for a wearable strain sensor is presented based on a hierarchical-gap response mechanism. A double-helical-structured elastic string was employed as the stretchable substrate, and carbon nanotubes were chosen as the resistance-sensitive nanostructures. A CNT-modified elastic string (CES) was obtained by directly coating CNTs onto the substrate. After polydimethylsiloxane encapsulation, a fiber-shaped resistive-type strain sensor was fabricated. It was attached to different joints for human body motion monitoring. The double-helical structure could produce hierarchical gaps as the applied strain increased, which served as spatial complemeNanoscale advancesA facile structural strategy for a wearable strain sensor based on carbon nanotube modified helical yarns.PMC94171512021M691363Zhao WXu SfalseA facile structural strategy for a wearable strain sensor based on carbon nanotube modified helical yarns.Wearable sensors have gained considerable popularity due to the potential feasibility in flexible electronics. In this work, a facile fabrication strategy for a wearable strain sensor is presented based on a hierarchical-gap response mechanism. A double-helical-structured elastic string was employed as the stretchable substrate, and carbon nanotubes were chosen as the resistance-sensitive nanostructures. A CNT-modified elastic string (CES) was obtained by directly coating CNTs onto the substrate. After polydimethylsiloxane encapsulation, a fiber-shaped resistive-type strain sensor was fabricated. It was attached to different joints for human body motion monitoring. The double-helical structure could produce hierarchical gaps as the applied strain increased, which served as spatial compleme2021-01-01T00:00:00Z2021 Dec2025-04-18T15:47:52.807Z2025-02-19T01:37:07.178ZS-EPMC94171513613296510.1039/d1na00215e