High-performance gas sensors can be used to detect low-concentration volatile organic compounds (VOCs), toxic and explosive gases in the atmospheric environment, which is of great significance to environmental protection and human health. In this paper, In₂O₃@HCNFs gas sensing material with core-shell structure was successfully synthesized by coaxial electrospinning method, and a new room temperature O₃ sensor was developed with potassium ferrite superionic conductor (K₂Fe₄O₇) as solid electrolyte. The response test shows that the K₂Fe₄O₇-In₂O₃@HCNFs sensor has the highest response value and the shortest response/recovery time for 180-420 ppb O₃. The logarithmic fitting of the response value and the O₃ concentration shows that the sensor has a stronger sensitivity to O₃. In addition, the K₂Fe₄O₇-In₂O₃@HCNFs sensor has good repeatability and stability for O₃. In the high humidity environment (90%RH), the sensor still has a certain response value to O₃, which proves the feasibility of the sensor under high humidity conditions. Additionally, the sensor has good selectivity for O₃ in the presence of other interfering substances. The excellent performance of K₂Fe₄O₇-In₂O₃@HCNFs sensor was verified by analyzing the structural composition of gas sensing materials and the detection mechanism of the sensor. Therefore, compared with the traditional uniaxial electrospinning, the In₂O₃@HCNFs composite synthesized by coaxial electrospinning has excellent gas sensing properties, and the solid electrolyte gas sensor prepared by it has a good application prospect in the detection of ppb-level O₃.

中文翻译：

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同轴纺丝合成常温固体电解质气体传感器用 In2O3@HCNFs 增强臭氧传感性能

高性能气体传感器可用于检测大气环境中低浓度的挥发性有机化合物 （VOCs）、有毒和爆炸性气体，对环境保护和人类健康具有重要意义。本文采用同轴静电纺丝法成功合成了具有核壳结构的 In₂O₃@HCNFs 气敏材料，并以钾铁氧体超离子导体（K₂Fe₄O₇）为固体电解质，研制了一种新型室温 O₃ 传感器。响应测试表明，K₂Fe₄O_{7-In 2}O₃@HCNFs 传感器在 180-420 ppb O₃ 时具有最高的响应值和最短的响应/恢复时间。响应值与 O₃ 浓度的对数拟合表明传感器对 O₃ 具有更强的灵敏度。此外，K₂Fe₄O₇ In₂O₃@HCNFs 传感器对 O₃ 具有良好的可重复性和稳定性。在高湿度环境（90%RH）下，传感器对 O₃ 仍具有一定的响应值，证明了传感器在高湿度条件下的可行性。此外，该传感器在存在其他干扰物质的情况下对 O₃ 具有良好的选择性。通过分析气体传感材料的结构组成和传感器的检测机理，验证了 K₂Fe₄O_{7-In 2}O₃@HCNFs 传感器的优异性能。 因此，与传统的单轴静电纺丝相比，同轴静电纺丝合成的 In₂O₃@HCNFs 复合材料具有优异的气敏性能，由其制备的固体电解质气体传感器在 ppb 级 O₃ 的检测中具有良好的应用前景。