High-Performance Self-Powered NO 2 Sensor With Nitrogen-Doped MOF-Derived In 2 O 3 Core-Shell Fiber Architecture

The development of wearable gas sensors requires advancing low-power sensing materials and integrating energy harvesting technologies for sustainable power supply. Here, a self-powered NO2sensor is proposed, employing a high-performance nitrogen-doped metal-organic framework derived In2O3(N-MOF-In2O3) sensor and triboelectric nanogenerator (MTP-TENG) as its key components. The porous core-shell fiber-like N-MOF-In2O3is synthesized through a straightforward solvothermal method followed by annealing and NO2exposure, achieving an exceptional response value (1460) and fast response/recovery time (320/220 s) to 1 ppm NO2at room temperature. The remarkable performance metrics are attributed to the unique hierarchical porosity of the core-shell architecture and the reconstruction of surface electronic states resulting from effective nitrogen doping. Additionally, MTP-TENG is designed with a conductive network of multi-walled carbon nanotubes embedded in thermoplastic polyurethane and paired with a polytetrafluoroethylene film. The integration of the N-MOF-In2O3sensor with the MTP-TENG enables the conversion of a resistive signal into a pulsed voltage output, resulting in a 28% reduction in response time. This study provides a promising strategy for high-performance, self-powered NO2detection at room temperature, contributing to the development of wearable gas-sensing devices.