The Polyaniline (PANI)@flower-like tungsten oxide (WO₃) nanocomposites with different mole percentages of flower-like WO₃ (2–50%) were successfully synthesized by using a facile in situ chemical oxidation polymerization method and were loaded on flexible polyethylene terephthalate (PET) substrate to fabricate NH₃ sensors operating at room temperature. The morphology, nanostructures and thermal degradation behavior of the as-obtained sensing materials were measured and characterized utilizing SEM, TEM, FTIR, XRD and TG. Gas-sensing performances of fabricated sensors were tested and results indicated that the sensor with [email protected] mol% flower-like WO₃ exhibited the highest response value at approximately 20.1–100 ppm NH₃ at room temperature, which is more than 6 times higher than that of pure PANI. Notably, the lowest detection limit of 500 ppb to NH₃ was obtained at room temperature. Furthermore, the present sensor also showed rapid response and recovery rates of 13 s and 49 s, good repeatability, selectivity, and slight humidity effects to 10 ppm NH₃ at room temperature. Moreover, the gas sensing mechanisms of PANI and nanocomposites were also discussed in detail. The enhanced sensing characteristics of nanocomposites were related to the morphology structure and p-n heterojuction between PANI and flower-like WO₃.

采用一种简便的原位化学氧化聚合方法成功合成了不同摩尔百分比的花状WO ₃（2–50％）的聚苯胺（PANI）@花状氧化钨（WO ₃）纳米复合材料，并将其负载在柔性树脂上聚对苯二甲酸乙二酯（PET）基板，以制造在室温下运行的NH ₃传感器。利用SEM，TEM，FTIR，XRD和TG对所得传感材料的形貌，纳米结构和热降解行为进行了测量和表征。测试了制成的传感器的气敏性能，结果表明，具有[电子邮件保护] mol％花状WO ₃的传感器在大约20.1–100 ppm NH时表现出最高的响应值₃在室温下，比纯PANI高6倍以上。值得注意的是，在室温下获得了NH ₃的最低检测限500 ppb 。此外，本传感器还显示出13 s和49 s的快速响应和恢复速度，良好的可重复性，选择性以及在室温下对10 ppm NH _3的轻微湿度影响。此外，还详细讨论了PANI和纳米复合材料的气体传感机理。纳米复合材料增强的传感特性与PANI和花状WO ₃之间的形态结构和p - n异质结有关。