Development of high-performance sensor based on NiO/SnO2 heterostructures to study sensing properties towards various reducing gases.

Published on Jul 9, 2020in Nanotechnology3.551
· DOI :10.1088/1361-6528/AB98BB
Salah Ud Din4
Estimated H-index: 4
(ZJU: Zhejiang University),
Mahmood ul Haq5
Estimated H-index: 5
(ZJU: Zhejiang University)
+ 5 AuthorsLiping Zhu72
Estimated H-index: 72
(ZJU: Zhejiang University)
In this work, we report the spontaneous formation of NiO nanoparticles-decorated on smooth SnO2 nanofibers, which is an inexpensive and scalable method to yield high composite surface area via two steps facile synthesis process based on electrospinning and hydrothermal method. The layers of nanofibers, which containing the conducting electrolyte of proton, Nickel Oxide are deposited homogeneously over a large surface area from transparent solution of the electrolyte mixed and decorated on Tin dioxide nanofibers, which show the evidence by cross sectional imaging of electrospun nanofibers. The composite based nanoparticles-decorated fibers enlarge the surface area of exposed electrolyte, which fundamentally improve the gas sensing performance. The crystal structure, morphology and physio-chemical surface state of specimen based on NiO/SnO2 were well explained by XRD, SEM, TEM, HRTEM, EDX and photoelectron (XPS) spectroscopy. The composite based on NiO/SnO2 nanoparticles-decorated fibers had shown an optimistic mesoporous nature with a huge specific area, which is very important for superior gas sensors. The result showed that NiO/SnO2 nanoparticles-decorated fibers with an average size of 180-260 nm in diameter and average length of fibers was about 1.5μm. The composite based heterojunction of NiO/SnO2 nanoparticles-decorated fibers enhanced the adsorption of oxygen molecules, which show fast response, good selectivity and quick recovery speed against ethanol gas at an optimal temperature of about 160 oC. The maximum sensitivity response of sensor-based composites NiO/SnO2 nanoparticles-decorated fibers were 23.87 towards 100 ppm ethanol gas at low temperature of 160 oC, which was about 7.2 times superior to that of pure SnO2 nanofibers. The superior gas sensing demonstration of composites based on NiO/SnO2 nanoparticles-decorated fibers might be attributed to the catalytic with small size effect of NiO nanoparticles on smooth SnO2 nanofibers and p/n heterojunction effects between NiO and SnO2 heterostructures.
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