Sensitivity Improvement of Urchin-Like ZnO Nanostructures Using Two-Dimensional Electron Gas in MgZnO/ZnO
1
Department of Electronics Engineering, Pusan National University, Busan 46241, Korea
2
Department of Smart Hybrid Engineering, Pusan National University, Busan 46241, Korea
*
Author to whom correspondence should be addressed.
Sensors 2019, 19(23), 5195; https://doi.org/10.3390/s19235195
Received: 29 October 2019
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Revised: 21 November 2019
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Accepted: 26 November 2019
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Published: 27 November 2019
(This article belongs to the Special Issue From Physical to Chemical Sensing: A Selection of the Best Papers Presented at the 2019 Symposium on Sensor Science)
This paper introduces a strategy for improving the sensitivity of a gas sensor to NO2 gas. The gas sensor was fabricated using urchin-like ZnO nanostructures grown on MgO particles via vapor-phase growth and decorated with MgZnO nanoparticles via a sol-gel process. The urchin-like ZnO gas sensor decorated with MgZnO showed higher sensitivity to NO2 gas than a pristine urchin-like ZnO gas sensor. When ZnO and MgZnO form a heterojunction, a two-dimensional electron gas is generated. This improves the performance of the fabricated gas sensor. The growth morphology, atomic composition, and phase structure were confirmed through field-emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray diffraction, respectively.
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Keywords:
gas sensors; 2DEG; ZnO; MgZnO; vapor phase growth; sol-gel
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MDPI and ACS Style
Bak, S.-Y.; Lee, J.; Kim, Y.; Lee, S.-H.; Woo, K.; Lee, S.; Yi, M. Sensitivity Improvement of Urchin-Like ZnO Nanostructures Using Two-Dimensional Electron Gas in MgZnO/ZnO. Sensors 2019, 19, 5195. https://doi.org/10.3390/s19235195
AMA Style
Bak S-Y, Lee J, Kim Y, Lee S-H, Woo K, Lee S, Yi M. Sensitivity Improvement of Urchin-Like ZnO Nanostructures Using Two-Dimensional Electron Gas in MgZnO/ZnO. Sensors. 2019; 19(23):5195. https://doi.org/10.3390/s19235195
Chicago/Turabian StyleBak, So-Young, Jeongseok Lee, Yoojong Kim, Se-Hyeong Lee, Kyoungwan Woo, Sanghyun Lee, and Moonsuk Yi. 2019. "Sensitivity Improvement of Urchin-Like ZnO Nanostructures Using Two-Dimensional Electron Gas in MgZnO/ZnO" Sensors 19, no. 23: 5195. https://doi.org/10.3390/s19235195
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