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“In the composites, p-n heterojunctions were formed at the interface of NiO and ZnO. The results of gas sensitivity tests showed that the incorporation of NiO considerably improved the gas sensitivity of ZnO to ethanol.”
Journal of nanoscience and nanotechnology • 2020 | View Paper
“In addition, researchers in Korea report how doping NiO nanofibres can improve the sensitivity to a number of gases, including ethanol , where the response was enhanced by as much as a factor of 217.86 [11].”