Ultrafast response and high-sensitivity acetone gas sensor based on porous hollow Ru-doped SnO2 nanotubes

Ru-doped porous hollow SnO2 nanotubes were prepared by simple electrospinning method, and their crystal structures, morphologies, and formation mechanism of porous hollow nanotubes were fully elucidated. The sensor based on the porous hollow Ru-doped SnO2 nanotubes shows an excellent sensing response of ~340 with ultrafast response time of 0.58 s at 250 ℃ to 100 ppm acetone. Moreover, the sensor exhibits good stability and excellent selectivity. Finally, the mechanism of the enhanced gas sensing properties was explained as the comprehensive effects of the larger specific surface area resulted from the hollow porous nanotubes structure, the ultra-fine SnO2 grain size, and the catalyst of RuO2. This research suggests the Ru-doped SnO2 nanotubes have the potential to be used as highly reliable and high-performance sensing layer for acetone gas sensors.