title: CO and NO₂ Selective Monitoring by ZnO-Based Sensors.
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.
authors.affiliation: Laboratory of Physics of Materials and Nanomaterials Applied at the Environment, Faculty of Sciences, University of Gabes, Gabes 6072, Tunisia. m.hjiri@yahoo.fr.
authors.forename: Mokhtar
authors.initials: M
authors.lastname: Hjiri
authors.affiliation: Laboratory of Physics of Materials and Nanomaterials Applied at the Environment, Faculty of Sciences, University of Gabes, Gabes 6072, Tunisia. lassaad.elmir@fsg.rnu.tn.|Department of Physics, College of Sciences, Al Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh 11623, Saudi Arabia. lassaad.elmir@fsg.rnu.tn.
authors.forename: Lassaad
authors.initials: L
authors.lastname: El Mir
authors.affiliation: Department of Electronic Engineering, Chemistry and Industrial Engineering, University of Messina, Messina 98166, Italy. leonardis@unime.it.
authors.forename: Salvatore Gianluca
authors.initials: SG
authors.lastname: Leonardi
authors.affiliation: Department of Electronic Engineering, Chemistry and Industrial Engineering, University of Messina, Messina 98166, Italy. ndonato@unime.it.
authors.forename: Nicola
authors.initials: N
authors.lastname: Donato
authors.affiliation: Department of Electronic Engineering, Chemistry and Industrial Engineering, University of Messina, Messina 98166, Italy. gneri@unime.it.
authors.forename: Giovanni
authors.initials: G
authors.lastname: Neri
keywords: CO; NO2; ZnO; electrospinning; gas sensor; nanofibers; nanoparticles; sol-gel