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Abstract：
Morphology and structure play a crucial role in influencing the performance of gas sensors. Hollow structures, in particular, not only increase the specific surface area of the material but also enhance the collision frequency of gases within the shell, and have been studied in depth in the field of gas sensing. Taking SnO2 as an illustrative example, a dual-shell structure SnO2 (D-SnO2) was prepared. D-SnO2@Polyaniline (PANI) (DSPx, x represents D-SnO2 molar content) composites were synthesized via the in situ oxidative polymerization method, and simultaneously deposited onto a polyethylene terephthalate (PET) substrate to fabricate an electrode-free, flexible sensor. The impact of the SnO2 content on the sensing performance of the DSPx-based sensor for NH3 detection at room temperature was discussed. The results showed that the response of a 20 mol% D-SnO2@PANI (DSP20) sensor to 100 ppm NH3 at room temperature is 37.92, which is 5.1 times higher than that of a pristine PANI sensor. Moreover, the DSP20 sensor demonstrated a rapid response and recovery rate at the concentration of 10 ppm NH3, with response and recovery times of 182 s and 86 s.
摘要：
形貌和结构对气体传感器的性能起着至关重要的作用。空心结构,特别是,不仅增加了材料的比表面积，而且提高了壳内气体的碰撞频率，并在气体传感领域进行了深入的研究。以SnO2为例，制备了双壳结构的SnO2(D-SnO2)。D-SnO2@聚苯胺(PANI)(DSPx,x表示D-SnO2摩尔含量)复合材料通过原位氧化聚合法合成，并同时沉积到聚对苯二甲酸乙二醇酯（PET）基板上以制造无电极，柔性传感器。讨论了SnO2含量对室温下基于DSPx的NH3传感器传感性能的影响。结果表明，室温下20mol％D-SnO2@PANI（DSP20）传感器对100ppmNH3的响应为37.92，是原始PANI传感器的5.1倍。此外，DSP20传感器在10ppmNH3浓度下表现出快速的响应和恢复速率，响应和恢复时间分别为182s和86s。
