The effect of MoS nanosheet (NS) decoration on the gas-sensing properties of SnO nanofibers (NFs) was investigated. The decorated sensors were fabricated by facile on-chip electrospinning technique and subsequently dropping MoS NSs-dispersed solution. The MoS NS decoration resulted in enhanced the response and reduced the operating temperature of SnO NFs towards SO gas. The SnO NF sensor decorated with the optimum density of MoS NSs exhibited about 10-fold enhancement in gas response to 10 ppm SO at 150 °C as compared with the bare SnO NF sensor. Furthermore, the decorated sensors exhibited an extremely low detection limit and good selectivity for SO gas against other interfering gases, such as CO, NH, and H. The enhanced SO gas-sensing performance of MoS NSs-decorated SnO NFs was attributed to the chemical sensitization of MoS NSs and charge transfer through heterojunctions between the NSs and SnO nanograins. The classification of toxic gases such as CO, H and NH by the MoS NSs-decorated SnO NF sensors can achieve high accuracy with linear discriminant analysis (LDA). Our results suggest that the one-dimensional nanostructures of semiconductor metal oxides decorated with two-dimensional transition metal dichalcogenides are attractive candidates for the detection of hazardous gases.
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