Robust, Breathable and Stretchable Liquid Metal Composite Nanofibre for Physiological Electrical Signal Monitoring.

Conductive elastic composite materials possess great application potential in the field of bioelectronic devices due to their excellent stretchability and electrical conductivity. However, conventional electronic skins hardly integrate the core characteristics of human natural skin simultaneously, including air permeability, water resistance, and high mechanical strength. In this work, a flexible and stretchable electronic skin is fabricated by combining liquid metal and electrospinning technology. Its resistance variation is less than 20% under stretching, twisting, and other mechanical deformations, while its water vapor transmission rate reaches 8100 g/m2·d. The electrospun fibrous structure can effectively suppress liquid metal leakage and delivers an electromagnetic interference shielding effectiveness of over -10 dB in the 1-18 GHz frequency range. Benefiting from these superior properties, the material enables comfortable and stable collection of various physiological electrical signals, maintaining reliable sensing performance even in humid environments and electromagnetic interference scenarios. This composite fabrication strategy remarkably improves the stability and reliability of biological monitoring in practical application scenarios.