Different from the dominant method of surface modification of metal oxide sensing materials with noble metals, a simple and low-cost method is developed by using Zn nanoparticles as a surface modifier in this work. The first step involves the fabrication of porous In₂O₃ nanofibers by an electrospinning technique, and then Zn nanoparticles decorated In₂O₃ nanofibers are constructed by a simple thermal evaporation method. An increase in surface ${\text{O}}_2^{-}$ species absorbing capability and a decrease in sensor resistance are observed by surface modification of In₂O₃ nanofibers with Zn nanoparticles. In comparison with pure In₂O₃ nanofibers, this kind of Zn–In₂O₃ composite nanofibers display higher response and better selectivity to NO₂. The response of Zn–In₂O₃ nanofibers is up to 130.00 to 5 ppm NO₂ at 50 °C, which is 13.7 times higher than that of pure In₂O₃. From our perspective, the improved NO₂ sensing performances of Zn–In₂O₃ composite nanofibers are mainly attributed to the enhanced resistance modulation because of the formation of ohmic contacts between Zn nanoparticles and In₂O₃ nanoparticles.

与使用贵金属对金属氧化物感测材料进行表面改性的主要方法不同，这项工作中使用锌纳米粒子作为表面改性剂，开发了一种简单且低成本的方法。第一步涉及通过静电纺丝技术制造多孔In ₂ O ₃纳米纤维，然后通过简单的热蒸发方法构造装饰有In ₂ O ₃纳米纤维的Zn纳米颗粒。表面增加${\text{Ø}}_2^{--}$通过用Zn纳米粒子对In ₂ O ₃纳米纤维进行表面改性，可以观察到这种物质的吸收能力和传感器电阻的降低。与纯In ₂ O ₃纳米纤维相比，这种Zn-In ₂ O ₃复合纳米纤维表现出更高的响应性和对NO _2的更好选择性。Zn-In ₂ O ₃纳米纤维在50°C下的响应高达130.00至5 ppm NO ₂，是纯In ₂ O _3的13.7倍。从我们的角度来看，改善了Zn–In ₂ O的NO ₂感测性能₃复合纳米纤维主要归因于增强的电阻调制，因为在Zn纳米粒子和In ₂ O ₃纳米粒子之间形成了欧姆接触。