Dual-mode MWCNTs-InSe sensor for temperature/NO2 detection: Wearable and system-level application

Simultaneous monitoring of temperature and gas concentration is crucial in many practical scenarios, as these two parameters are often strongly coupled. However, conventional sensing platforms typically rely on multiple single-function sensors, increasing system complexity and limiting their applicability. In this work, we first develop a rigid multi-wall carbon nanotubes (MWCNTs)‑indium selenide (InSe) sensor with excellent dual-mode temperature and nitrogen dioxide (NO 2 ) sensing capabilities, achieving high thermal sensitivity and ppb-level gas detection. Building on this foundation, a wearable version of the sensor is fabricated, enabling robust performance under mechanical deformation. Finally, the flexible device is integrated into a compact system featuring two independent sensing channels, real-time display, and threshold-triggered alarms. This study demonstrates a simple yet powerful strategy to realize multifunctional environmental sensing with a single sensor unit and highlights its strong potential for next-generation wearable electronics and intelligent environmental monitoring.