Construction of 0d-2d Heterostructure Driven by Mof-Derived Co3o4 and Ti3c2tx Mxene for Ultra-Sensitive Hexanal Detection

Abstract

Developing a high-performance gas sensor for detecting hexanal, which serves as a biomarker for lung cancer, is crucial for real-time monitoring of major human diseases. In this work MOF-derived Co3O4/Ti3C2Tx MXene nanocomposite intended for hexanal detection was synthesized viaelectrostatic self-assembly method. The introduction of MXene, with its high conductivity and carrier transport ability, enabled the prepared sensor to exhibit high sensitivity (141 to 5 ppm), low detection limits (0.1 ppm), considerable selectivity, and stability even in low operating temperature (50 ℃) for hexanal detection. The gas-sensing mechanism is primarily attributed to the synergistic effect of introducing more oxygen vacancies and the heterojunction structure between the two nanomaterials, which effectively promotes gas-sensing properties compared to the original Co3O4 sensor. This work provides new insights into effectively lowering the operating temperatures of metal-oxide-based gas sensors.

Keywords: Gas sensor, MOF-derived Co3O4, Ti3C2Tx MXene, Hexanal, Low operating temperature