Pt-loaded In₂O₃ mesoporous nanofibers (NFs) have been prepared by electrospinning, followed by a facile reduction method. The sample obtained by adding tea saponin into the spinning solution, sample In-TS, displays a more than 4 times higher specific surface area, value of 86.9 m² g⁻¹, than that of conventionally prepared samples. The loading with small-sized Pt nanoparticles (NPs) determines excellent gas sensing performance towards NO₂ down to ppb level (R_g/R_a = 2.8 to 10 ppb and 23.9–1 ppm) at room temperature (RT), by that significantly lowering the power consumption. The reason is that the open pores and channels on the mesoporous NFs generated by the foaming agent not only promote the adsorption and desorption of NO₂ molecules on the sensing layers, but also improves the transduction function of the sensors by ensuring that there are no parts of the fiber that are not accessible to the gases. The introduction of Pt to the mesoporous NFs could accelerate the dissociation of absorbed oxygen and the active surface reactions in NO₂ owing to the catalytic property and chemical sensitization of well-dispersed Pt NPs. Due to the unique gas sensing performance, sample In-TS-Pt has a prospect for applications in low-concentration NO₂ detection at RT.

通过电纺丝，然后采用简便的还原方法制备了负载Pt的In ₂ O _3中孔纳米纤维（NFs）。通过将茶皂素添加到纺丝溶液中而获得的样品In-TS的比表面积是传统制备样品的46.9倍，比表面积为86.9 m ²  g ^-1。小型Pt纳米颗粒（NPs）的负载决定了对低至ppb水平的NO ₂（R _g / R _a 在室温（RT）时= 2.8至10 ppb和23.9–1 ppm），从而显着降低了功耗。原因是由发泡剂产生的中孔NFs上的开孔和通道不仅促进了NO ₂分子在传感层上的吸附和解吸，而且通过确保不存在任何部分来改善传感器的转导功能。气体无法接触到的纤维中的一部分。将Pt引入介孔NFs可以促进吸附氧的离解和NO _2中的活性表面反应，这是由于Pt NPs的分散性具有催化特性和化学敏化作用。由于其独特的气体传感性能，In-TS-Pt样品在低浓度NO的应用中具有广阔的前景RT ₂检测。