Conductometric Cr2O3/TiO2/Ti3C2Tx Gas Sensor for Detecting Triethylamine at Room Temperature

MXene-based gas-sensitive nanocomposites are an area of high interest in developing high-performance gas sensors that operate at room temperature. Combining MXene with different nano-sized metal oxides is a strategy to improve sensing performance, but poor chemical stability, especially in humid environments, is the biggest obstacle to practical applications. Recently we demonstrated a method to prepare a ternary heterostructure gas sensor by decorating a stable TiO2/Ti3C2Tx composite with MoO3 which also provided selectivity. Here, we develop the proposed concept by synthesizing a Cr2O3/TiO2/Ti3C2Tx gas-sensitive material that shows a unique rapid and selective response to Triethylamine. In addition, the sensor offers excellent chemical stability and can maintain its morphology and gas sensing performance even after ageing at 500 °C for two months. This work demonstrates the validity of the proposed approach for an additional metal oxide and yields a sensor that exhibits potential for excellent practical application in harsh environment.