Anti-Pressing and Punch-Free Interconnects for Stretchable Multi-Layer Hybrid Electronics

Long-term wearable flexible electronic devices are crucial for health monitoring. These devices must excel in fit, breathability, anti-interference capabilities, and maintaining daily life quality. However, during prolonged signal monitoring, the hybrid interface of flexible electronics often generates significant noise due to pressure, friction, and stretching, which disrupts signal acquisition. In this study, we address this challenge by employing liquid metal as the connection for the hybrid interface. Liquid metal's insensitivity to pressure and its stable connectivity under stretching and friction make it an ideal choice. Our device, subjected to 1000 cycles of 200 kPa pressure, exhibited a minimal resistance change rate of just 3.7%. Importantly, the device does not produce noise signals that interfere with target signal acquisition during compression and friction post-wearing. This advancement has been successfully applied in long-term foot pressure detection and sedentary monitoring for diabetic patients.