Reduced Graphene Oxide-Based Chemiresistive NO2sensor: Metal Oxide Nanoparticles Decoration Effect

We present the development of a stretchable platform-based nitrogen dioxide (NO 2 ) gas sensor that operates at room temperature (RT). This study investigates the impact of incorporating metal oxide nanoparticles (NPs) into a chemiresistive NO 2 gas sensor, utilizing reduced graphene oxide (rGO) as the primary sensing material. By introducing mesoporous ZnFe 2 O 4 (ZFO) NPs at different concentrations into the rGO sensing layer, the performance of the gas sensor is significantly enhanced. The inclusion of ZFO NPs, which possess high-density defect sites, contributes to fast response and recovery times across a wide range of NO 2 concentrations (150 to 4000 ppb). Various transient parameters are analyzed to assess the effects of ZFO NPs integration. The rGO-ZFO-based gas sensor exhibits improved sensitivity and reproducibility. Moreover, these sensors, integrated into a stretchable platform and capable of RT operation, open possibilities for the development of advanced wearable NO 2 gas sensors in the future.