期刊
LANGMUIR
卷 34, 期 48, 页码 14577-14585出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.langmuir.8b02620
关键词
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资金
- National Nature Science Foundation of China [51572075]
- Analytical and Testing Center of Huazhong University of Science and Technology (HUST)
In this work, we report a metal-organic framework (MOF)-assisted strategy to synthesize necklace-like TiO2/Co3O4 nanofibers with highly ordered heterostructures via a facile approach including electro-spinning and subsequent calcination. Polycrystalline TiO2 nanofibers and Co3O4 nanocages are consummately interconnected to form a highly ordered heterogeneous nanostructure, which can be of benefit for precisely accommodating the interface resistance of the p-n heterojunctions and the future realization of improved material performance. The ethanol-gas-sensing investigation showed that TiO2/Co3O4 nanofiber sensors exhibited a strong ethanol response (Rair/Rgas -1 = 16.7 @ 150 ppm) and a low operating temperature of 150 degrees C. The sensing enhancement mechanism of the TiO2/Co3O4 nanofibers is related to the formation of heterojunctions at interfaces and the high catalytic activity of MOF-derived Co3O4. Furthermore, this versatile method is a promising approach to constructing ordered heterostructures and extending the MOF-based heterogeneous materials toward wide applications.
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