V2CTx gas sensor based on memristive effect with ultrafast SO2 detection

As a commonly harmful product produced in industrial production, the sensitive detection of SO2 is a crucial safety consideration with adverse impacts on human health. However, constructing MXene-based gas sensors for rapid detection at room temperature is still challenging. In this work, we demonstrate a V2CTx gasistor (gas memristor) with a millisecond-level cycle (360 ms) for SO2 ultrafast detection, and meanwhile, the function of gas response and memory is realized. Specifically, the synaptic plasticity of paired-pulse facilitation (PPF) behavior has been applied to identify the different types of gases instead of gas sensitivity. Consistent with gas response performance, the gasistor displays the highest pulse-controlled PPF ratio (210.4%) under 10 ms electric pulse interval for 10 ppm SO2, 1.34 times that under air. Also, the V2CTx gasistor exhibits excellent repeatability and good stability. Furthermore, this strategy provides a great application prospect in rapid detection and medical treatment for toxic gases and artificial sensing memory.