Hierarchical α-Fe2O3/NiO composites with a hollow structure for a gas sensor

Chen Wang, Xiaoyang Cheng, Xin Zhou, Peng Sun, Xiaolong Hu, Kengo Shimanoe, Geyu Lu, Noboru Yamazoe

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257 Citations (Scopus)


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-Fe 2O3 and NiO.

Original languageEnglish
Pages (from-to)12031-12037
Number of pages7
JournalACS Applied Materials and Interfaces
Issue number15
Publication statusPublished - Aug 13 2014

All Science Journal Classification (ASJC) codes

  • General Materials Science


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