LAUSR

Modern electronics, which are indispensable for human health, safety, and communication, present a wide spectrum of opportunities to evolve our society into an intelligent world.[1–3] To this end, considerable attention has been paid to wearable and flexible electronics, owing to their promising applications in a vast number of fields, ranging from flexible power supply,[4–6] stretchable circuitries,[7] personal healthcare/biomedical monitoring,[8,9] artificial electronic skin,[10,11] to wearable human-interactive interface.[12] Among them, numerous types of selfpowered functional sensors for health monitoring,[13] motion tracking,[14] medical care,[15] personal protection, and security[16] have been developed, which present an exciting opportunity to measure human physiology and mobility signals in a continuous, real-time, and noninvasive manner. However, the further advancement of wearable electronics still faces several critical challenges. First, the operations of these wearable electronics usually require external power sources. Conventional The emergence of stretchable textile-based mechanical energy harvester and self-powered active sensor brings a new life for wearable functional electronics. However, single energy conversion mode and weak sensing capabilities have largely hindered their development. Here, in virtue of silver-coated nylon yarn and silicone rubber elastomer, a highly stretchable yarn-based triboelectric nanogenerator (TENG) with coaxial core–sheath and built-in spring-like spiral winding structures is designed for biomechanical energy harvesting and real-time human-interactive sensing. Based on the two advanced structural designs, the yarn-based TENG can effectively harvest or respond rapidly to omnifarious external mechanical stimuli, such as compressing, stretching, bending, and twisting. With these excellent performances, the yarn-based TENG can be used in a self-counting skipping rope, a self-powered gesture-recognizing glove, and a real-time golf scoring system. Furthermore, the yarn-based TENG can also be woven into a large-area energy-harvesting fabric, which is capable of lighting up light emitting diodes (LEDs), charging a commercial capacitor, powering a smart watch, and integrating the four operational modes of TENGs together. This work provides a new direction for textile-based multimode mechanical energy harvesters and highly sensitive self-powered motion sensors with potential applications in sustainable power supplies, self-powered wearable electronics, personalized motion/health monitoring, and real-time human-machine interactions.