Design of highly sensitive and selective ethanol sensor based on α-Fe 2 O 3/Nb 2 O 5 heterostructure

Published on May 7, 2021in Nanotechnology3.551
· DOI :10.1088/1361-6528/ABDD5E
Rabia Khatoon6
Estimated H-index: 6
(ZJU: Zhejiang University),
Sajid Rauf11
Estimated H-index: 11
+ 7 AuthorsJianguo Lu42
Estimated H-index: 42
(ZJU: Zhejiang University)
The introduction of heterostructure is a new approach in gas sensing due to its easy and quick transport of charges. Herein, facile hydrothermal and solid-state techniques are employed to synthesize α-Fe2O3/Nb2O5 heterostructure. The morphology, microstructure, crystallinity, and surface composition of the synthesized heterostructure are investigated by SEM, TEM, XRD, XPS, and BET analyses. The mutual incorporation of α-Fe2O3 nanorods with Nb2O5 interconnected nanoparticles (INP) for the successful fabrication of a heterostructure. A sensor based on α-Fe2O3 (0.09)/Nb2O5 heterostructure with high surface area exhibited enhanced gas sensing features, maintaining high selectivity and sensitivity, and a considerable recovery percentage towards ethanol gas. The sensing response of the α-Fe2O3 (0.09)/Nb2O5 heterostructure at lower operating temperature (160 oC) is ~9 times higher than pure Nb2O5 (INP) sensor at 180 oC at the flow of 100 ppm ethanol gas. Besides, the sensors also show excellent selectivity, good long-term stability and as well as rapid response/recovery time (8s/2s, respectively) to ethanol. The superior electronic conductivity and upgraded sensitivity performance of gas sensors based on α-Fe2O3 (0.09)/Nb2O5 heterostructure are attributed due to unique structural features, high specific surface area, and synergic effect of n-n heterojunction. The promising results demonstrated the potential application of α-Fe2O3 (0.09)/Nb2O5 heterostructure as a good sensing material in the fabrication of the ethanol sensor.
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