Journal
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
Volume 34, Issue 29, Pages -Publisher
SPRINGER
DOI: 10.1007/s10854-023-11340-7
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This paper reports the development of a conductometric ethanol sensor based on Fe2O3/Co3O4 nano-heterostructures. The electrical and ethanol sensing properties of the synthesized nano-heterostructures were investigated. The results show that the sensor displays improved ethanol sensing ability with good sensitivity, short response/recovery time, repeatability, and selectivity.
In this paper, the development of a conductometric ethanol sensor based on Fe2O3/Co3O4 nano-heterostructures, synthesized by sol-gel auto combustion reaction method, is reported. The as-synthesized composite nanoparticles with different Fe2O3/Co3O4 molar ratio were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectra (EDX), and diffuse reflectance spectroscopy (DRS). The electrical and ethanol sensing properties of the Fe2O3/Co3O4 nano-heterostructures were investigated. The results reveal that, when operated at the optimal working temperature of 250 degree celsius, the Fe2O3/Co3O4 (0.6:1 molar ratio) based sensor displays significantly improved ethanol sensing ability compared to pristine Co3O4. Good sensitivity, short response/recovery time, repeatability, and selectivity are the distinctive characteristics of the sensor developed. The improved ethanol sensing performances are attributed to the presence of p-n heterojunction in the Fe2O3/Co3O4 nano-heterostructures synthesized.
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