n-n Heterogeneous MoS2/SnO2 Nanotubes and The Excellent Triethylamine (TEA) Sensing Performances

Considering the different electron structure-related physical properties and their own sensing advantages of MoS2 and SnO2, we report a novel n-n heterogeneous MoS2/SnO2 nanotubes and the excellent triethylamine (TEA) sensing performances. MoS2/SnO2 hollow nanotubes were prepared using electrospinning combined with hydrothermal treatment. The crystal structure, morphology features and microstructure were characterized by XRD, SEM and TEM, etc. Gas sensing investigations show that MoS2/SnO2 sensor exerts preeminent selectivity and high response to TEA at 200 degrees C. The heterogeneous composite sensor could effectively detect TEA concentration as low as 1 ppm. The response and recovery time to 100 ppm TEA are about 62 s and 153 s, respectively. The sensing mechanism caused by the synergistic effect of n-n type heterojunctions and unique tubular nanostructure are discussed.