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.

Automated summary

In this study, a V2CTx gasistor (gas memristor) was used for ultrafast detection of SO2, with gas response and memory functions realized. The gasistor showed the highest pulse-controlled paired-pulse facilitation (PPF) ratio (210.4%) for 10 ppm SO2 under 10 ms electric pulse interval, 1.34 times higher than under air. It also exhibited excellent repeatability and stability, with promising applications in rapid detection, medical treatment, and artificial sensing memory for toxic gases.