Synthesis of Co 3 O 4 /TiO 2 composite by pyrolyzing ZIF-67 for detection of xylene

Shouli Bai, Ke Tian, Ye Tian, Jun Guo, Yongjun Feng, Ruixian Luo, Dianqing Li, Aifan Chen, Chung Chiun Liu

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56 Scopus citations


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 languageEnglish
Pages (from-to)384-392
Number of pages9
JournalApplied Surface Science
StatePublished - 30 Mar 2018


  • Co/Ti based ZIF-67
  • Co O /TiO composite
  • p-n heterojunction
  • Xylene sensor


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