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Nanomaterials 2013, 3(3), 357-369; doi:10.3390/nano3030357
Article

CO and NO2 Selective Monitoring by ZnO-Based Sensors

1
,
1,2
,
3
,
3
 and
3,*
1 Laboratory of Physics of Materials and Nanomaterials Applied at the Environment, Faculty of Sciences, University of Gabes, Gabes 6072, Tunisia 2 Department of Physics, College of Sciences, Al Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh 11623, Saudi Arabia 3 Department of Electronic Engineering, Chemistry and Industrial Engineering, University of Messina, Messina 98166, Italy
* Author to whom correspondence should be addressed.
Received: 21 May 2013 / Revised: 20 June 2013 / Accepted: 21 June 2013 / Published: 5 July 2013
(This article belongs to the Special Issue Nanomaterials in Sensors)
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Abstract

ZnO nanomaterials with different shapes were synthesized, characterized and tested in the selective monitoring of low concentration of CO and NO2 in air. ZnO nanoparticles (NPs) and nanofibers (NFs) were synthesized by a modified sol-gel method in supercritical conditions and electrospinning technique, respectively. CO and NO2 sensing tests have demonstrated that the annealing temperature and shape of zinc oxide nanomaterials are the key factors in modulating the electrical and sensing properties. Specifically, ZnO NPs annealed at high temperature (700 °C) have been found sensitive to CO, while they displayed negligible response to NO2. The opposite behavior has been registered for the one-dimensional ZnO NFs annealed at medium temperature (400 °C). Due to their adaptable sensitivity/selectivity characteristics, the developed sensors show promising applications in dual air quality control systems for closed ambient such as automotive cabin, parking garage and tunnels.
Keywords: ZnO; nanoparticles; nanofibers; gas sensor; CO; NO2; sol-gel; electrospinning ZnO; nanoparticles; nanofibers; gas sensor; CO; NO2; sol-gel; electrospinning
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.

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Hjiri, M.; El Mir, L.; Leonardi, S.G.; Donato, N.; Neri, G. CO and NO2 Selective Monitoring by ZnO-Based Sensors. Nanomaterials 2013, 3, 357-369.

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