Abstract
ZnO/NiO fractal-percolation nanosystems have been sensitized using a newly developed three-step technology. During the first stage, ionically sputtered Zn vapors have been deposited under near-equilibrium condensation conditions. In the second stage, Zn layers have been oxidized in air atmosphere, and during the final stage, a NiO layer has been deposited onto the ZnO surface using reactive magnetron sputtering. Gas sensor tests have been performed by measuring current–voltage characteristics of the fractal-percolation nanosystems in air containing methanol or methane. It has been shown that the shape of the I–V curve depends on the reactive gas nature, rendering the possibility to differentiate between different gases, which is an important step to increase sensor selectivity.
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Acknowledgments
Anna Kornyushchenko thanks the Humboldt Foundation for a research fellowship that allowed her to carry out investigations in the Institute of Materials Physics, University of Muenster, Germany. The work was also supported by the Ministry of Science and Education of Ukraine within the research Grant Number 0119U100763.
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Kornyushchenko, A., Kosminska, Y., Stas, S. et al. Structural, Morphological and Sensor Properties of the Fractal-Percolation Nanosystem ZnO/NiO. Journal of Elec Materi (2021). https://doi.org/10.1007/s11664-021-08749-3
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Keywords
- ZnO
- NiO nanostructures
- gas sensor
- current–voltage characteristics
- charge transfer
- reducing gas