Preparation of a high-performance H2S gas sensor based on CuO/Co3O4composite derived from bimetallic MOF

Zhanhong Li; Xu Wang; Yu Yao; Jiangang Xin; Lili Xie; Yutong Han; Zhigang Zhu

doi:10.1088/1361-6528/ad2481

Preparation of a high-performance H₂S gas sensor based on CuO/Co₃O₄composite derived from bimetallic MOF

Nanotechnology. 2024 Feb 19;35(19). doi: 10.1088/1361-6528/ad2481.

Authors

Zhanhong Li¹, Xu Wang², Yu Yao¹, Jiangang Xin³, Lili Xie³, Yutong Han¹, Zhigang Zhu¹

Affiliations

¹ School of Health Science and Engineering, University of Shanghai for Science and Technology, Shanghai, 200093, People's Republic of China.
² National Enterprise Technology Center, Inner Mongolia Erdos Electric Power and Metallurgy Group Company Limited, Ordos 016064, Inner Mongolia, People's Republic of China.
³ School of Energy and Materials, Shanghai Polytechnic University, Shanghai, 201209, People's Republic of China.

PMID: 38295405
DOI: 10.1088/1361-6528/ad2481

Abstract

The bimetallic metal-organic frameworks (MOFs), Cu/Co-MOF, was synthesized through a solvothermal method and calcined to obtain CuO/Co₃O₄composites. By adjusting the molar ratio between Cu and Co ions, a composite material of CuO/Co₃O₄(Cu:Co = 1:1) was developed and showed excellent sensing capabilities, and the response reached as high as 196.3 for 10 ppm H₂S detection. Furthermore, the optimal operating temperature as low as 40 °C was found. In comparison with the sensors prepared by pristine CuO and pristine Co₃O₄, the sensor based on CuO/Co₃O₄composite exhibited a significant response. Additionally, the sensor can detect H₂S gas down to 300 ppb. The gas sensing mechanism is discussed in depth from the perspective of p-p heterojunction formation between the p-type CuO and p-type Co₃O₄. The as-prepared CuO/Co₃O₄composite-based sensor is expected to find practical application in the low-power monitoring of H₂S.

Keywords: CuO/Co3O4; H2S; bimetallic MOF; gas sensor; p–p junction.