Synergistic Electrical, Mechanosensitive, and Photothermal‐Antibacterial Polyurethane/Carbon Nanotube Composites for Wearable Distributed Sensing

The rapid advancement of wearable electronics and biomedical sensing necessitates flexible sensor materials with mechanical adaptability, electrical stability, and multifunctionality. Herein, we design a polytetrahydrofuran ether diol (PTMG)-based polyurethane (PU) composite system incorporating carboxylated carbon nanotubes (CNTs) as conductive fillers. The polyurethane/carbon nanotube composite with 1% CNT content (PU/1% CNT) exhibits optimal performance, achieving a balanced electrical conductivity of 0.062 S/m, strain-sensitive behavior with a tunable gauge factor (GF = 1.7-3.1) across graded deformations, and exceptional photothermal antibacterial efficacy (96.3%-100% inactivation rate). Notably, when integrated into a LabVIEW-based multi-channel testing system, the material demonstrates robust signal synchronization and distributed sensing capability. This work presents a versatile, stable, and scalable material platform for next-generation flexible sensors, particularly in wearable health monitoring applications.