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Decoration of CuO NWs Gas Sensor with ZnO NPs for Improving NO2 Sensing Characteristics
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Decoration of CuO NWs Gas Sensor with ZnO NPs for Improving NO2 Sensing Characteristics
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Journal Article
Decoration of CuO NWs Gas Sensor with ZnO NPs for Improving NO2 Sensing Characteristics
2021
Overview
This paper introduces a method for improving the sensitivity to NO2 gas of a p-type metal oxide semiconductor gas sensor. The gas sensor was fabricated using CuO nanowires (NWs) grown through thermal oxidation and decorated with ZnO nanoparticles (NPs) using a sol-gel method. The CuO gas sensor with a ZnO heterojunction exhibited better sensitivity to NO2 gas than the pristine CuO gas sensor. The heterojunction in CuO/ZnO gas sensors caused a decrease in the width of the hole accumulation layer (HAL) and an increase in the initial resistance. The possibility to influence the width of the HAL helped improve the NO2 sensing characteristics of the gas sensor. The growth morphology, atomic composition, and crystal structure of the gas sensors were analyzed using field-emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectroscopy, and X-ray diffraction, respectively.
Publisher
MDPI,MDPI AG
Subject
