Author(s): Fan, Yizhuo; Wang, Wei; Zhang, Jiafeng; Lu, Yang; Liu, Caixia; Adimi, Samira; Zhou, Jingran; Ruan, Shengping; Chen, Yu

Source: SENSORS AND ACTUATORS B-CHEMICAL Volume: 344 Article Number: 130129 DOI: 10.1016/j.snb.2021.130129 Published: OCT 1 2021

Abstract: Metal organic framework (MOF)-derived porous metal oxide nanostructures have become a kind of promising material for gas-sensitive detection. A facile solvothermal method was adopted to construct CoWO4/alpha-Fe2O3 nanocomposites, in which MIL-53(Fe) was used as the precursor of alpha-Fe2O3. The prepared alpha-Fe2O3 has a unique three-dimensional nanostructure, resulting in good dispersion of CoWO4 nanoparticles on the surface and a distinct structure of partially CoWO4-modified alpha-Fe2O3 (PC-Fe2O3). XPS characterization indicates that this PCFe2O3 heterostructure exposes the high density of active centers, leading to an increase in the amount of adsorbed oxygen on the material surface. The sensor based on the prepared CoWO4/alpha-Fe2O3 composite exhibits higher response, faster response/recovery, and better selectivity to ethyl acetate than the pristine alpha-Fe2O3 octahedra. It is believed that the enhanced sensing performance can be attributed to the resistance modulation effect of the heterojunction, the properties of MOFs-derived material, and the formation of the unique PC-Fe2O3 structure.

Accession Number: WOS:000679305100005

eISSN: 0925-4005

Full Text: https://www.sciencedirect.com/science/article/pii/S0925400521006985?via%3Dihub