Electrospinning preparation and room temperature gas sensing properties of porous In2O3 nanotubes and nanowires

Abstract Porous In 2 O 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 2 S. The results demonstrate that the sensors had optimum and high responses to H 2 S at room temperature in dilute 1–100 ppm 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 2 O 3 . The present electrospun In 2 O 3 NTs/NWs have demonstrated the potential applied for H 2 S gas detection under room temperature.

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