Abstract
Co 3 O 4 /TiO 2 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 Co 3 O 4 . Moreover, Co 3 O 4 /TiO 2 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.
Original language | English |
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Pages (from-to) | 384-392 |
Number of pages | 9 |
Journal | Applied Surface Science |
Volume | 435 |
DOIs | |
State | Published - 30 Mar 2018 |
Keywords
- Co/Ti based ZIF-67
- Co O /TiO composite
- p-n heterojunction
- Xylene sensor