A controllable surface etching strategy for MOF-derived porous ZnCo2O4@ZnO/Co3O4 oxides and their sensing properties

Wang Li; Yulin Guo; Yan Liu; Wen Yang; Jifan Hu; Jiangwei Ma

doi:10.1039/d3ra05135h

A controllable surface etching strategy for MOF-derived porous ZnCo₂O₄@ZnO/Co₃O₄ oxides and their sensing properties

RSC Adv. 2023 Aug 22;13(36):24936-24943. doi: 10.1039/d3ra05135h. eCollection 2023 Aug 21.

Authors

Wang Li^{1

2}, Yulin Guo¹, Yan Liu¹, Wen Yang¹, Jifan Hu^{1

2}, Jiangwei Ma^{1

2}

Affiliations

¹ College of Materials Science and Engineering, Taiyuan University of Science and Technology Taiyuan 030003 China 2019014@tyust.edu.cn jiangweima@tyust.edu.cn.
² Laboratory of Magnetic and Electric Functional Materials and the Applications, The Key Laboratory of Shanxi Province Taiyuan 030024 China.

Abstract

Here, we report a surface etching strategy for the controllable synthesis of metal-organic framework (MOF)-derived ZnCo₂O₄@ZnO/Co₃O₄ oxides. Different from previous studies, ZnCo-glycolate (ZnCo-gly) spheres acted as sacrificial templates to provide Zn²⁺ and Co²⁺ ions, which coordinated with 2-MeIm to form Zeolitic Imidazolate Frameworks (ZIFs) on the surface of ZnCo-gly. A series of characterizations were employed to clarify the evolution of the surface etching strategy. Interestingly, the ZIF thickness of the ZnCo-gly surface could be controlled by adjusting the reaction time. After calcination, p-n heterojunctions were formed between the MOF-derived ZnO and Co₃O₄, which made it show excellent selectivity to methanal gas.