Abstract Fe3O4/FeOOH nanocomposites were synthesized by a simplistic precipitation method for high-performance gas sensing applications. A spray-coating method was used to deposit a sensitive film of Fe3O4/FeOOH nanocomposites on a quartz crystal microbalance (QCM). The structural and morphological characteristics were analyzed by using X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive X-ray spectrometry (EDS), Fourier transforms infrared (FTIR) spectroscopy, and a vibrating sample magnetometer (VSM). The average diameter and length of the FeOOH nanorods were 30 and 100 nm, respectively. The maximum saturation magnetization of the prepared Fe3O4/FeOOH nanocomposites obtained a value ~30 emu g−1. The QCM sensor based on the Fe3O4/FeOOH nanocomposites was measured with various concentrations of toxic gases (CO, NO2, SO2) at room temperature. The gas sensing results indicated that the developed sensor had a considerable potentiality to apply for toxic gas sensors with a high detection sensitivity, repeatability, and good stability.

中文翻译：

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用于质量型气体传感器的 Fe3O4/FeOOH 纳米复合材料的合成、表征和气敏特性

摘要 Fe3O4/FeOOH 纳米复合材料是通过一种简单的沉淀法合成的，用于高性能气体传感应用。使用喷涂方法在石英晶体微量天平 (QCM) 上沉积 Fe3O4/FeOOH 纳米复合材料的敏感膜。使用X射线衍射（XRD）、扫描电子显微镜（SEM）、能量色散X射线光谱（EDS）、傅里叶变换红外（FTIR）光谱和振动样品磁强计（VSM）分析了结构和形态特征. FeOOH 纳米棒的平均直径和长度分别为 30 和 100 nm。制备的 Fe3O4/FeOOH 纳米复合材料的最大饱和磁化强度约为 30 emu g-1。基于 Fe3O4/FeOOH 纳米复合材料的 QCM 传感器用各种浓度的有毒气体（CO、NO2、SO2) 在室温下。气体传感结果表明，该传感器具有检测灵敏度高、重复性好、稳定性好等特点，在有毒气体传感器中具有相当大的应用潜力。