Metal oxide-based gas sensors are widely studied and applied due to simple operation principle, small size and high stability. However, numerous gas sensors based on metals oxides usually exhibit high optimal operating temperatures and show poor response/recovery performance at room temperature (RT). To overcome the above problems, innovative device forms should be explored. Herein, we developed a memristor-based gas sensor (gasistor) for the detection of dilute methanol vapor at RT, and the resistive layer material was SnS-modified TiO₂. Compared with the general film-based gas sensors, the gasistor exhibits unique resistive switching function, and the baseline resistance in the high resistance state is reduced by about 3 × 10⁴ times, demonstrating the construction of gasistor is an effective way to solve the high resistance of metal oxides at RT. Meanwhile, the SnS/TiO₂-based gasistor showed a high response of 85.2 for 1 ppm methanol, a fast response/recovery within 1.2 s for rarefied methanol (< 5 ppm), and remarkable selectivity towards methanol at RT. This indicates that the SnS/TiO₂-based gasistor is a competitive candidate for methanol detection. Besides, the mechanisms of resistive switching and gas sensing were further discussed. The present work brings new inspiration to the future research of gas sensors.

基于金属氧化物的气体传感器由于工作原理简单、体积小和稳定性高而被广泛研究和应用。然而，许多基于金属氧化物的气体传感器通常表现出较高的最佳工作温度，并且在室温 (RT) 下表现出较差的响应/恢复性能。为克服上述问题，应探索创新的装置形式。在此，我们开发了一种基于忆阻器的气体传感器（气敏电阻），用于在室温下检测稀甲醇蒸汽，电阻层材料为 SnS 修饰的 TiO ₂。与一般薄膜气敏元件相比，该气敏电阻具有独特的阻变功能，高阻态基线电阻降低约3×10 ⁴次，论证构造气敏电阻是解决金属氧化物在室温下电阻高的有效途径。同时，基于 SnS/TiO ₂的气化器对 1 ppm 甲醇表现出 85.2 的高响应，对稀薄甲醇（< 5 ppm）在 1.2 秒内的快速响应/恢复，以及在室温下对甲醇的显着选择性。这表明基于 SnS/TiO ₂的气敏电阻是甲醇检测的竞争候选者。此外，还进一步讨论了电阻开关和气体传感的机制。目前的工作为气体传感器的未来研究带来了新的启发。