What question did this study set out to answer?

The aim is to develop a torsional sensor using hierarchical chiral yarn that ensures stability and self-recovery.

May 16, 2026Advanced Functional Materials0 citations

Hierarchically Chiral Self‐Plied Yarn for Torsional Stability and Self‐Recovery, and Its Application to Direction‐Selective, Low‐Frequency, Wide‐Range Mechano‐Electrochemical Torsional Sensor

HKHyunsoo Kim YHYoungkun Hong SKSeonghyun Kim

Key Points

The aim is to develop a torsional sensor using hierarchical chiral yarn that ensures stability and self-recovery.
Designed a hierarchical chiral self-plied carbon nanotube yarn with a torque-balanced rocking design.
Evaluated sensor capabilities including torsional stability, self-recovery, and direction-selective sensing.
Tested performance in low-frequency motion detection across a wide sensing range.
Demonstrated torsional stability in a free-standing configuration without external constraints.
Achieved self-recovery after deformation, indicating robust performance.
Enabled direction-selective sensing with a wide operating range for real-time motion monitoring applications.

Abstract

ABSTRACT We report a hierarchical chiral self‐plied carbon nanotube yarn torsional sensor featuring a torque‐balanced rocking design that enables stable, self‐standing operation without external constraints. The hierarchical chiral structure establishes a torque‐balanced state through the interplay between filament torque and interply counter‐torque, ensuring mechanical stability and self‐recovery. As a result, the sensor exhibits five key capabilities: (1) torsional stability in a free‐standing configuration, (2) self‐recovery after deformation, (3) direction‐selective sensing, (4) low‐frequency motion detection, and (5) a wide sensing range. This self‐powered sensor provides a promising platform for real‐time motion monitoring in wearable healthcare, soft robotics, and human–machine interfaces.

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