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Decoration of CuO NWs Gas Sensor with ZnO NPs for Improving NO2 Sensing Characteristics

1
Department of Smart Interdisciplinary Engineering, Pusan National University, Busan 46241, Korea
2
Department of Electronics Engineering, Pusan National University, Busan 46241, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Eduard Llobet
Sensors 2021, 21(6), 2103; https://doi.org/10.3390/s21062103
Received: 9 February 2021 / Revised: 5 March 2021 / Accepted: 12 March 2021 / Published: 17 March 2021
(This article belongs to the Section Chemical Sensors)
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. View Full-Text
Keywords: gas sensors; CuO; nanowires; ZnO NPs; sol-gel; heterojunction gas sensors; CuO; nanowires; ZnO NPs; sol-gel; heterojunction
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MDPI and ACS Style

Han, T.-H.; Bak, S.-Y.; Kim, S.; Lee, S.H.; Han, Y.-J.; Yi, M. Decoration of CuO NWs Gas Sensor with ZnO NPs for Improving NO2 Sensing Characteristics. Sensors 2021, 21, 2103. https://doi.org/10.3390/s21062103

AMA Style

Han T-H, Bak S-Y, Kim S, Lee SH, Han Y-J, Yi M. Decoration of CuO NWs Gas Sensor with ZnO NPs for Improving NO2 Sensing Characteristics. Sensors. 2021; 21(6):2103. https://doi.org/10.3390/s21062103

Chicago/Turabian Style

Han, Tae-Hee; Bak, So-Young; Kim, Sangwoo; Lee, Se H.; Han, Ye-Ji; Yi, Moonsuk. 2021. "Decoration of CuO NWs Gas Sensor with ZnO NPs for Improving NO2 Sensing Characteristics" Sensors 21, no. 6: 2103. https://doi.org/10.3390/s21062103

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