Fe3O4 nano-octahedral Fe-Fe3O4 (1 1 1) polar surface coordinated Fe atom enhanced sensing properties and its sensing atomic mechanism

Xiaohua Meng,Yan Ren,Yali Zhou,Junyi Guo,Le Zhang,Chen Qi,Bin Liu,Heqing Yang,Shengzhong Liu

Applied Surface Science（2023）

Cited 2|Views9

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Abstract

•Fe3O4 nanooctahedrons exposed with polar {111} crystal planes have been prepared.•The Fe3O4 nanooctahedrons show higher sensitivity than Fe3O4 commercial powders.•The sensitivity is proportional to the density of 3-coordinated Fe atoms at (111) plane.•The 3-coordinated Fe atom is found to act as an active site for gas sensing.•The active Fe atoms adsorb oxygen, create electrons and catalyze sensing reactions.

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Key words

Fe3O4 nano-octahedrons,{111} polar crystal planes,Gas sensing,3-coordinated Fe atoms,Sensing active sites

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