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      CO and NO 2 Selective Monitoring by ZnO-Based 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 NO 2 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 NO 2 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 NO 2. 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.

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          Most cited references29

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          New approaches for improving semiconductor gas sensors

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            Controlled Growth of ZnO Nanowires and Their Optical Properties

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              CHEMICAL SENSING AND CATALYSIS BY ONE-DIMENSIONAL METAL-OXIDE NANOSTRUCTURES

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                Author and article information

                Journal
                Nanomaterials (Basel)
                Nanomaterials (Basel)
                nanomaterials
                Nanomaterials
                MDPI
                2079-4991
                05 July 2013
                September 2013
                : 3
                : 3
                : 357-369
                Affiliations
                [1 ]Laboratory of Physics of Materials and Nanomaterials Applied at the Environment, Faculty of Sciences, University of Gabes, Gabes 6072, Tunisia; E-Mails: m.hjiri@ 123456yahoo.fr (M.H.); lassaad.elmir@ 123456fsg.rnu.tn (L.E.)
                [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; E-Mails: leonardis@ 123456unime.it (S.G.L.); ndonato@ 123456unime.it (N.D.)
                Author notes
                [* ]Author to whom correspondence should be addressed; E-Mail: gneri@ 123456unime.it ; Tel.: +39-090-397-7297; Fax: +39-090-397-7464.
                Article
                nanomaterials-03-00357
                10.3390/nano3030357
                5304650
                42a033c6-2121-4263-9363-119df3695c4f
                © 2013 by the authors; licensee MDPI, Basel, Switzerland.

                This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license ( http://creativecommons.org/licenses/by/3.0/).

                History
                : 21 May 2013
                : 20 June 2013
                : 21 June 2013
                Categories
                Article

                zno,nanoparticles,nanofibers,gas sensor,co,no2,sol-gel,electrospinning
                zno, nanoparticles, nanofibers, gas sensor, co, no2, sol-gel, electrospinning

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