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Study of the primary sensitivity of polypyrrole/r-Fe2O3 to toxic gases

机译：聚吡咯/ r-Fe2O3对有毒气体的主要敏感性研究

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Polypyrrole (PPy) was prepared by chemical oxidation using methoxy ethanol as solvent and Fe(NO3)(3)center dot 9H(2)O as oxidant. PPy/r-Fe2O3 was prepared by simultaneously gelling and polymerization, using the same solvent and oxidant. The materials were characterized by FTIR, XRD, TG-DTA, SEM, and HRTEM, and studied for the gas sensitivity. From the TG-DTA curve of PPy/r-Fe2O3, we found that the degradation temperature of PPy was about 210 degrees C, so the annealing temperatures of PPy/r-Fe2O3 were selected at 110 degrees C, 150 degrees C, 180 degrees C, and 200 degrees C. The influence of the mole ratio of Fe(NO3)(3)center dot 9H(2)O to py=1:1, 2:1, 3:1, 4:1, and 5:1 on the gas sensitivities of PPy was investigated. It was found that PPy had the maximum sensitivity to NH3 and H2S at the mole ratio of Fe(NO3)(3)center dot 9H(2)O:py=3:1 at room temperature, and the sensitivities were 48.5 and 31.4, respectively. PPy/r-Fe2O3 materials had no gas sensitivity at room temperature. When the working temperature increased to 90 degrees C, PPy/r-Fe2O3 materials appeared gas sensitivity, PPy/r-Fe2O3 annealed at 150 degrees C had the maximum sensitivity to NH3 and H2S, and the sensitivities were 68 and 406.8, respectively, but PPy lost gas sensitivity at this temperature. The results suggested that PPy/r-Fe2O3 had higher sensitivity and more heat stability than PPy, and the working temperature was lower than the reported working temperature of r-Fe2O3 about 350 degrees C, it had better properties than both pure PPy and r-Fe2O3. (c) 2005 Elsevier B.V. All rights reserved.
机译：聚吡咯（PPy）是通过使用甲氧基乙醇作为溶剂并以Fe（NO3）（3）中心点9H（2）O作为氧化剂进行化学氧化制备的。使用相同的溶剂和氧化剂，通过同时胶凝和聚合反应制备PPy / r-Fe2O3。通过FTIR，XRD，TG-DTA，SEM和HRTEM对材料进行了表征，并研究了其气体敏感性。从PPy / r-Fe2O3的TG-DTA曲线可知，PPy的降解温度约为210摄氏度，因此选择PPy / r-Fe2O3的退火温度为110摄氏度，150摄氏度，180摄氏度。 Fe（NO3）（3）中心点9H（2）O与py = 1：1、2：1、3：1、4：1和5的摩尔比的影响：对PPy的气体敏感性进行了研究（图1）。发现在室温下，Fe（NO3）（3）中心点9H（2）O：py = 3：1的摩尔比下，PPy对NH3和H2S的敏感性最高，灵敏度为48.5和31.4，分别。 PPy / r-Fe2O3材料在室温下没有气体敏感性。当工作温度升高到90摄氏度时，PPy / r-Fe2O3材料出现了气体敏感性，在150摄氏度退火的PPy / r-Fe2O3对NH3和H2S的敏感性最高，敏感性分别为68和406.8。 PPy在此温度下失去了对气体的敏感性。结果表明，PPy / r-Fe2O3比PPy具有更高的灵敏度和更高的热稳定性，工作温度比r-Fe2O3的报道工作温度低约350摄氏度，其性能优于纯PPy和r-Fe2O3。氧化铁（c）2005 Elsevier B.V.保留所有权利。

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