A synthesis procedure based on single-capillary electrospinning and hard-template method was provided to synthesize hierarchical α-Fe₂O₃/SnO₂ nanofibers. The samples exhibit unique microstructure where α-Fe₂O₃ nanoparticles were evenly decorated on three-dimensional SnO₂ fibrous scaffold. During preparation, the α-Fe₂O₃ nanoparticles and SnO₂ nanofibers were formed synchronously. Within the composite nanomaterials, the Fe/Sn content ratio can be adjusted by changing the diameter of SnO₂ nanofibers backbone. Scanning electron microscopy, transmission electron microscopy, X-ray diffraction, energy dispersive X-ray spectroscopy and nitrogen adsorption-desorption analysis were used to characterize the structure of the synthesized products. By loading α-Fe₂O₃ nanoparticles, the grain growth of SnO₂ was effectively restrained during heat treatment in air. The optimum Fe/Sn content ratio of α-Fe₂O₃/SnO₂ heterostructures with the highest sensitivity was obtained through ethanol sensing measurements. Compared to pure α-Fe₂O₃ and SnO₂ nanofibers, the binary composite nanofibers exhibits not only enhanced ethanol sensing response, but also higher dependence of response to the change of ethanol concentration. The remarkable improvement of sensing performance can be attributed to the synergetic effect of the component phases. The influences of heterojunctions on the gas sensing properties of α-Fe₂O₃/SnO₂ nanofibers were discussed.

基于单毛细管电纺丝和硬模板方法的合成步骤来合成分层的α-Fe提供₂ ö ₃ /的SnO ₂纳米纤维。样品表现出独特的微结构，其中的α-Fe _2个ö ₃纳米颗粒均匀地装饰三维的SnO ₂纤维支架。在制备期间，所述的α-Fe _2个ö _3个纳米颗粒和SnO ₂纳米纤维进行同步形成。在复合纳米材料中，可以通过改变SnO ₂的直径来调节Fe / Sn含量比纳米纤维的主干。使用扫描电子显微镜，透射电子显微镜，X射线衍射，能量色散X射线光谱和氮吸附-脱附分析来表征合成产物的结构。通过加载的α-Fe ₂ ö ₃纳米颗粒，SnO的晶粒生长₂在空气中的热处理过程中有效地抑制。α-Fe的最佳的Fe / Sn的含量比₂ ö ₃ /的SnO ₂通过乙醇感测测量得到异质结构具有最高的灵敏度。相比于纯的α-Fe ₂ ö ₃和SnO ₂纳米纤维，二元复合纳米纤维不仅表现出增强的乙醇感测响应，而且对乙醇浓度变化的响应具有更高的依赖性。感测性能的显着改善可归因于各组分相的协同效应。异质结对的α-Fe的气体感测性能的影响₂ ö ₃ /的SnO ₂进行了讨论纳米纤维。