Electrospinning preparation and room temperature gas sensing properties of porous In_2O_3 nanotubes and nanowires

摘要

Porous In_2O_3 nanotubes (NTs) and nanowires (NWs) in cubic phase were fabricated via electrospinning and characterized by scan electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and N_2 adsorption experiments. The NTs had an average outer diameter of ~80 nm and wall thickness of ~15 nm, while the NWs had a diameter of ~120 nm. The gas sensing properties of the prepared NTs/NWs were measured for H_2S. The results demonstrate that the sensors had optimum and high responses to H_2S at room temperature in dilute 1-100ppm concentration range. They also display excellent selectivity, anti-interference and stability. The gas sensing mechanism at room temperature was attributed to the sulfuration of In_2O_3. The present electrospun In_2O_3 NTs/NWs have demonstrated the potential applied for H_2S gas detection under room temperature.