A controllable surface etching strategy for MOF-derived porous ZnCo 2 O 4 @ZnO/Co 3 O 4 oxides and their sensing properties

A surface etching strategy was proposed for the controllable synthesis of MOF-derived ZnCo 2 O 4 @ZnO/Co 3 O 4 oxides, and the ZnCo 2 O 4 @ZnO/Co 3 O 4 -6 h sensor device exhibits the highest response and excellent selectivity to 100 ppm methanal at 200 °C.