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Chemosensors 2018, 6(4), 61; https://doi.org/10.3390/chemosensors6040061

Hydrogen Sensing Properties of Co-Doped ZnO Nanoparticles

1
Department of Materials Science and Engineering, Shiraz University, Shiraz 71964-84334, Iran
2
Young Researchers and Elite Club, Islamic Azad University, Shiraz Branch, Sadra city, Shiraz 74731-71987, Iran
3
Department of Materials Science and Engineering, Shiraz University of Technology, Shiraz 71557-13876, Iran
4
Department of Engineering, University of Messina, Contrada di Dio, I-98166 Messina, Italy
*
Author to whom correspondence should be addressed.
Received: 28 October 2018 / Revised: 27 November 2018 / Accepted: 3 December 2018 / Published: 5 December 2018
(This article belongs to the Special Issue Hierarchical Nanostructures for Gas Sensors)
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Abstract

In this study, the gas sensing properties of Co-doped ZnO nanoparticles (Co-ZnO NPs) synthesized via a simple sol-gel method are reported. The microstructure and morphology of the synthesized Co-ZnO NPs were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM), respectively. Co-ZnO NPs were then used for developing a conductometric gas sensor for the detection, at mild temperature, of low concentration of hydrogen (H2) in air. To evaluate the selectivity of the sensor, the sensing behavior toward some VOCs such as ethanol and acetone, which represent the most important interferents for breath hydrogen analysis, was also investigated in detail. Results reported demonstrated better selectivity toward hydrogen of the Co-ZnO NPs sensor when compared to pure ZnO. The main factors contributing to this behavior, i.e., the transition from n-type behavior of pristine ZnO to p-type behavior upon Co-doping, the modification of oxygen vacancies and acid-base characteristics have been considered. Hence, this study highlights the importance of Co doping of ZnO to realize a high performance breath hydrogen sensor. View Full-Text
Keywords: Co-doped ZnO; nanoparticle; sol-gel; hydrogen; ethanol; gas sensor; sensing mechanism Co-doped ZnO; nanoparticle; sol-gel; hydrogen; ethanol; gas sensor; sensing mechanism
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Moosavi, F.; Bahrololoom, M.E.; Kamjou, R.; Mirzaei, A.; Leonardi, S.G.; Neri, G. Hydrogen Sensing Properties of Co-Doped ZnO Nanoparticles. Chemosensors 2018, 6, 61.

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