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Open AccessArticle

Improved Sensitivity of α-Fe2O3 Nanoparticle-Decorated ZnO Nanowire Gas Sensor for CO

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(8), 1903; https://doi.org/10.3390/s19081903
Received: 12 March 2019 / Revised: 5 April 2019 / Accepted: 20 April 2019 / Published: 22 April 2019
(This article belongs to the Special Issue Recent Advances in Gas Nanosensors)
A strategy for improving the sensitivity of a sensor for detecting CO and NH3 gases is presented herein. The gas sensor was fabricated from ZnO metal oxide semiconductor nanostructures grown via a vapor–liquid–solid process and decorated with α-Fe2O3 nanoparticles via a sol–gel process. The response was enhanced by the formation of an α-Fe2O3/ZnO n–n heterojunction and the growth of thinner wires. ZnO nanowires were grown on indium–tin–oxide glass electrodes using Sn as a catalyst for growth instead of Au. The structure and elemental composition were investigated using field-emission scanning electron microscopy, energy dispersive X-ray spectroscopy, and X-ray diffraction. The gas sensing results indicate that the response value to 100 ppm CO was 18.8 at the optimum operating temperature of 300 °C. View Full-Text
Keywords: gas sensors; nanowires; n–n heterojunction; vapor–liquid–solid; sol–gel; ZnO gas sensors; nanowires; n–n heterojunction; vapor–liquid–solid; sol–gel; ZnO
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MDPI and ACS Style

Lee, J.; Lee, S.-H.; Bak, S.-Y.; Kim, Y.; Woo, K.; Lee, S.; Lim, Y.; Yi, M. Improved Sensitivity of α-Fe2O3 Nanoparticle-Decorated ZnO Nanowire Gas Sensor for CO. Sensors 2019, 19, 1903.

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