Self-Powered Stretchable Sensor Could Transform Wearable Tech and Robotics

Researchers at KAIST have created a self-powered sensor that stretches to nearly seven times its original length. The device uses piezoelectric fibres to convert movement into electrical signals without batteries. It could revolutionise healthcare and robotics with its durability and precision. The sensor’s design relies on a ‘Hierarchical Resilient Structure’ to maintain performance after repeated use. Coiling the piezoelectric fibres allows it to extend up to 668% while staying sensitive. Elastic polymer particles embedded in the nanofibres improve mechanical strength and self-repair capabilities.

Strong bonds between the piezoelectric layers and electrodes prevent peeling under strain. This ensures steady electrical output even when deformed. Machine learning helps the sensor distinguish between different mechanical inputs for accurate biosignal tracking.

The technology was detailed in ACS Nano and supported by grants from the National Research Foundation of Korea. It harvests energy from body movements, eliminating the need for external power sources. This sensor opens doors for advanced prosthetics, electronic skins, and soft robots with human-like sensing. Its self-powered nature and extreme stretchability make it a promising tool for digital health and wearable tech. The research marks a significant step in flexible, energy-harvesting devices.