A Solution‐Processable, Omnidirectionally Stretchable, and High‐Pressure‐Sensitive Piezoresistive Device

The development of omnidirectionally stretchable pressure sensors with high performance without stretching‐induced interference has been hampered by many challenges. Herein, an omnidirectionally stretchable piezoresistive pressure‐sensing device is demonstrated by combining an omniaxially stretchable substrate with a 3D micropattern array and solution‐printing of electrode and piezoresistive materials. A unique substrate structural design and materials mean that devices that are highly sensitive are rendered, with a stable out‐of‐plane pressure response to both static (sensitivity of 0.5 kPa−1 and limit of detection of 28 Pa) and dynamic pressures and the minimized in‐plane stretching responsiveness (a small strain gauge factor of 0.17), achieved through efficient strain absorption of the electrode and sensing materials. The device can detect human‐body tremors, as well as measure the relative elastic properties of human skin. The omnidirectionally stretchable pressure sensor with a high pressure sensitivity and minimal stretch‐responsiveness yields great potential to skin‐attachable wearable electronics, human–machine interfaces, and soft robotics applications. An omnidirectionally stretchable, piezoresistive pressure‐sensing device is realized by combining a stress‐relieving and omniaxially stretchable substrate having regular 3D micropattern arrays with a solution‐processed silver‐paste electrode and a piezoresistive nanocomposite. This enables highly sensitive pressure responses while the in‐plane stretching responsivity is minimized. The device is demonstrated to detect body tremors and measure the relative elastic properties of human skin.