A copolymer of pyrrole and o-aminophenol was synthesized by single step oxidative polymerization technique. Two different nanocomposites of copolymer with α-Fe₂O₃ and Co-α-Fe₂O₃ were prepared and acetone sensing property of both composites were studied at room temperature with different gas concentrations. The calculated sensitivity of the Co-α-Fe₂O₃ nanocomposite was 0.68 and α-Fe₂O₃ nanocomposite was 0.44. The sensitivity of prepared composites was higher than the pure polymer. The LOD of the α-Fe₂O₃ composite was found to be 0.13 ppm and Co-α-Fe₂O₃ composite was 0.37 ppm. Both the prepared composites have showed excellent selectivity with good repeatability for the acetone gas. The 20% Co-Fe₂O₃ containing nanocomposite sensor exhibited faster response time of 1.4 s and recovery time of 4.4 s towards the target gas and 15% α-Fe₂O₃ containing nanocomposite sensor exhibited the response time of 1.4 s and recovery time of 4.8 s for the acetone gas. The polymer and the nanocomposites have shown excellent repeatability for 7 cycles. The faster response of the sensor can be attributed to the increased number of oxygen vacancies on the sensor as well as the free OH groups present in the polymer back bone.

中文翻译：

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基于共轭聚合物纳米复合材料的高灵敏度丙酮传感器

采用一步氧化聚合技术合成了吡咯与邻氨基苯酚的共聚物。_{制备了两种不同的α-Fe 2} O ₃和Co-α-Fe ₂ O ₃共聚物纳米复合材料，并研究了两种复合材料在室温和不同气体浓度下的丙酮传感性能。Co-α-Fe ₂ O ₃纳米复合材料的计算灵敏度为0.68，α-Fe ₂ O ₃纳米复合材料为0.44。制备的复合材料的灵敏度高于纯聚合物。_{发现 α-Fe 2} O ₃复合物的 LOD为 0.13 ppm，Co-α-Fe ₂ O₃复合物为 0.37 ppm。两种制备的复合材料都显示出出色的选择性，对丙酮气体具有良好的重复性。含有20% Co-Fe ₂ O ₃的纳米复合传感器对目标气体表现出更快的响应时间 1.4 s 和 4.4 s 的恢复时间，含有 15% α-Fe 2 O 3 的纳米复合传感器表现出 1.4 s 的响应_时间和_恢复时间丙酮气体的时间为 4.8 秒。聚合物和纳米复合材料在 7 个循环中表现出出色的可重复性。传感器的更快响应可归因于传感器上氧空位数量的增加以及聚合物主链中存在的游离 O  H 基团。