Ultrahigh Linear Temperature Sensors Based on Poly(3,4-Ethylenedioxythiophene):Poly(Styrenesulfonate) with Negative Temperature Compensation for Wireless Temperature Monitoring

With further exploration in wearable electronic devices, thermally responsive nanocomposites with high sensitivity, fast response, and good linearity characteristics are urgently needed. In this study, a flexible thermoresistive temperature sensor with high sensitivity and linearity was fabricated by integrating poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS), multiwall carbon nanotubes (MWCNTs), and waterborne polyurethane (WPU). Notably, doping PEDOT:PSS with a negative temperature coefficient as the temperature compensation effectively addressed the nonlinear problem of responsive resistance from the material level, realizing the extraordinary linearity and high sensitivity of the PEDOT:PSS/MWCNT@WPU (PMW) temperature sensors. The prepared sensors exhibit high sensitivity (−2.0%·°C–1), linearity (R2 = 0.994), accuracy (0.1 °C), and response (0.63 s/°C) within the range of 30–60 °C. Based on this, the fabricated temperature sensor can combine with the Arduino electronic components to achieve the wireless real-time monitoring of skin temperature, ambient temperature, and respiratory rate, highlighting its great potential in electronic skins, intelligent robotic platforms, environmental surveillance, and other fields.