title: Hierarchical α-Fe2O3/NiO composites with a hollow structure for a gas sensor.
abstract: 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.
authors.affiliation: State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University , Changchun 130012, People's Republic of China.
authors.forename: Chen
authors.initials: C
authors.lastname: Wang
authors.forename: Xiaoyang
authors.initials: X
authors.lastname: Cheng
authors.forename: Xin
authors.initials: X
authors.lastname: Zhou
authors.forename: Peng
authors.initials: P
authors.lastname: Sun
authors.forename: Xiaolong
authors.initials: X
authors.lastname: Hu
authors.forename: Kengo
authors.initials: K
authors.lastname: Shimanoe
authors.forename: Geyu
authors.initials: G
authors.lastname: Lu
authors.forename: Noboru
authors.initials: N
authors.lastname: Yamazoe