Journal
ACS APPLIED NANO MATERIALS
Volume 1, Issue 9, Pages 4671-4681Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.8b00932
Keywords
LaFeO3/alpha-Fe2O3 composites; metal-organic framework; gas sensor; heterojunction; porosity
Funding
- National Natural Science Foundation of China [11574110]
- Project of Science and Technology Plan of Jilin Province [201602041013GX, 20180414020GH]
- Project of Jilin Provincial Development and Reform Commission [2018C040-2]
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Semiconducting metal oxides (SMOs) with a porous structure have been paid close attention because of their large specific surface area. Three-dimensional LaFeO3/alpha-Fe2O3 nano-octahedrons were synthesized by a facile one-step solvothermal method, and a metal-organic framework was used as a self-sacrificing template. The method included the synthesis of MIL-53(Fe)/Fe-La hydroxide precursor and its conversion into a LaFeO3/alpha-Fe2O3 porous nanostructure by thermal annealing in air. A variety of techniques were employed to study the structures and morphology of the nano-octahedrons, including XRD, field emission SEM (FESEM), TEM, XPS, ICP-OES, and BET analysis. The gas-sensing performances of LaFeO3/alpha-Fe2O3 nano-octahedrons to acetone were studied. Upon construction of a heterostructure, the gas-sensing performances of LaFeO3/alpha-Fe2O3 nano-octahedrons were significantly improved as compared to that of pure alpha-Fe2O3. In addition, the sensor was noted to have superior reversibility and selectivity. Such a good performance may be due to a porous nanostructure and p-n heterojunctions between two types of oxides.
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