Room-temperature NO2 sensing performance of ZnO/Ti3C2TX heterojunctions

초록

In recent years, metallic Ti3C2Tx MXenes have garnered considerable attention in the realm of gas sensors owing to their distinc-tive characteristics, including high conductivity, inherent hydrophilicity, and abundant surface termination groups. Nonetheless, Ti3C2Tx-based sensing composites encounter challenges related to response/recovery time and low sensitivity, thereby limiting their applicability across diverse environmental conditions. Addressing these limitations, we present the synthesis of ZnO/Ti3C2Tx nanocomposites via a facile method for gas sensing applications. The optimized composite exhibits a notable response of around 6.1% to 5 ppm NO2, coupled with remarkable selectivity at ambient temperatures. Moreover, the sensor demonstrates exceptional reproducibility across multiple testing iterations. The observed enhancement in gas sensing performance is attributed to the abun-dance of oxygen vacancies and surface functional groups within the ZnO/Ti3C2Tx composites, which facilitate robust interactions with NO2 molecules. These findings underscore the efficacy of ZnO/Ti3C2Tx nanocomposites as a viable strategy for enhancing the gas sensing properties of Ti3C2Tx-based sensors.

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