Journal
APPLIED SURFACE SCIENCE
Volume 435, Issue -, Pages 384-392Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2017.10.080
Keywords
Co3O4/TiO2 composite; p-n heterojunction; Xylene sensor; Co/Ti based ZIF-67
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Funding
- National Natural Science Foundation of China [51372013, 51772015]
- Beijing Engineering Center for Hierarchical Catalysts
- Foundation of Guangxi Department of Education
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Co3O4/TiO2 composites with p-n heterojunction have been successfully prepared by pyrolyzing sacrificial template of Ti ion loaded Co-based Zeolitic imidazolate framework (ZIF-67). The structure and morphology of composite have been characterized by means of the analysis of XRD, FESEM, HRTEM and XPS spectra. The composite with a Co/Ti molar ratio of 4:1 exhibits the maximum sensing response of 6.17-50 ppm xylene, which is 5 times higher than pristine Co3O4. Moreover, Co3O4/TiO2 composite also shows good selectivity, long-term stability and rapid response and recovery. Such excellent sensing performances are attributed to material porous structure, high specific surface and the formation of abundant p-n heterojunction that permits the gas adsorption, diffusion and surface reaction and then improve the gas sensing performance. This work develops a promising synthesized approach of metal oxide composites for broader MOFs application in gas sensor field. (C) 2017 Elsevier B.V. All rights reserved.
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