Wei Kefeng, Zhao Sikai, Zhang Wei, Zhong Xiangxi, Li Tingting, Cui Baoyu, Gao Shuling, Wei Dezhou, Shen Yanbai
Shen Kan Engineering and Technology Corporation, MCC., Shenyang 110169, China.
School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China.
Nanomaterials (Basel). 2019 Jul 10;9(7):994. doi: 10.3390/nano9070994.
One-dimensional Zn-doped α-FeO nanowires have been controllably synthesized by using the pure pyrite as the source of Fe element through a two-step synthesis route, including the preparation of Fe source solution by a leaching process and the thermal conversion of the precursor solution into α-FeO nanowires by the hydrothermal and calcination process. The microstructure, morphology, and surface composition of the obtained products were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. It was found that the formation process of α-FeO is significantly influenced by the introduction of Zn. The gas sensing measurements indicated that the sensor based on 1% Zn-doped α-FeO nanowires showed excellent HS sensing properties at the optimum operating temperature of 175 °C. Notably, the sensor showed a low HS detection limit of 50 ppb with a sensor response of 1.5. Such high-performance sensing would be ascribed to the one-dimensional structure and high specific surface area of the prepared 1% Zn-doped α-FeO nanowires, which can not only provide a large number of surface active sites for the adsorption and reaction of the oxygen and HS molecules, but also facilitate the diffusion of the gas molecules towards the entire sensing materials.
通过两步合成路线，以纯黄铁矿作为铁元素源，可控合成了一维锌掺杂α - FeO纳米线，该路线包括通过浸出过程制备铁源溶液以及通过水热和煅烧过程将前驱体溶液热转化为α - FeO纳米线。采用X射线衍射、扫描电子显微镜、透射电子显微镜和X射线光电子能谱对所得产物的微观结构、形态和表面组成进行了表征。结果发现，锌的引入对α - FeO的形成过程有显著影响。气敏测试表明，基于1%锌掺杂α - FeO纳米线的传感器在175℃的最佳工作温度下表现出优异的硫化氢传感性能。值得注意的是，该传感器对硫化氢的检测下限低至50 ppb，传感器响应为1.5。这种高性能传感归因于所制备的1%锌掺杂α - FeO纳米线的一维结构和高比表面积，这不仅可以为氧气和硫化氢分子的吸附和反应提供大量表面活性位点，还可以促进气体分子向整个传感材料的扩散。
