State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University , Changchun 130012, People's Republic of China.
ACS Appl Mater Interfaces. 2014 Aug 13;6(15):12031-7. doi: 10.1021/am501063z. Epub 2014 Jul 16.
Hierarchical α-Fe2O3/NiO composites with a hollow nanostructure were synthesized by a facile hydrothermal method. The structures and morphologies of the composites were investigated by different kinds of techniques, including X-ray diffraction, field-emission electron scanning microscopy, transmission electron microscopy, and energy dispersive spectroscopy. Hierarchical α-Fe2O3/NiO composites were fabricated by growing the α-Fe2O3 nanorods on the surfaces of porous NiO nanosheets with a thickness of ∼12 nm. The gas sensing properties of hierarchical α-Fe2O3/NiO composites toward toluene were investigated using a static system. The response of α-Fe2O3/NiO composites to 100 ppm toluene was ∼18.68, which was 13.18 times higher than that of pure NiO at 300 °C. The enhanced response can be attributed to heterojunction. Meanwhile, the rapid response and recovery characteristics were observed because of the porous hollow structural characteristics and catalytic actions of α-Fe2O3 and NiO.
具有中空纳米结构的分级 α-Fe2O3/NiO 复合材料通过简便的水热法合成。通过不同的技术，包括 X 射线衍射、场发射电子扫描显微镜、透射电子显微镜和能谱，研究了复合材料的结构和形态。通过在厚度约为 12nm 的多孔 NiO 纳米片表面生长 α-Fe2O3 纳米棒，制备了分级 α-Fe2O3/NiO 复合材料。使用静态系统研究了分级 α-Fe2O3/NiO 复合材料对甲苯的气敏性能。α-Fe2O3/NiO 复合材料对 100ppm 甲苯的响应约为 18.68，在 300°C 时比纯 NiO 高 13.18 倍。增强的响应可归因于异质结。同时，由于多孔中空结构的特点和 α-Fe2O3 和 NiO 的催化作用，观察到了快速的响应和恢复特性。
