title: Conductive Photo-Activated Porphyrin-ZnO Nanostructured Gas Sensor Array.
abstract: Chemoresistors working at room temperature are attractive for low-consumption integrated sensors. Previous studies show that this feature can be obtained with photoconductive porphyrins-coated ZnO nanostructures. Furthermore, variations of the porphyrin molecular structure alter both the chemical sensitivity and the photoconductivity, and can be used to define the sensor characteristics. Based on these assumptions, we investigated the properties of an array of four sensors made of a layer of ZnO nanoparticles coated with porphyrins with the same molecular framework but different metal atoms. The array was tested with five volatile organic compounds (VOCs), each measured at different concentrations. Results confirm that the features of individual porphyrins influence the sensor behavior, and the differences among sensors are enough to enable the discrimination of volatile compounds disregarding their concentration.
authors.affiliation: Department of Electronic Engineering, University of Rome Tor Vergata, Via Politecnico 1, 00133 Roma, Italy. magna.gabriele@gmail.com.
authors.forename: Gabriele
authors.initials: G
authors.lastname: Magna
authors.affiliation: Department of Electronic Engineering, University of Rome Tor Vergata, Via Politecnico 1, 00133 Roma, Italy. catini@ing.uniroma2.it.
authors.forename: Alexandro
authors.initials: A
authors.lastname: Catini
authors.affiliation: Department of Electronic Engineering, University of Rome Tor Vergata, Via Politecnico 1, 00133 Roma, Italy. rajkumar.lmd@gmail.com.
authors.forename: Raj
authors.initials: R
authors.lastname: Kumar
authors.affiliation: Department of Electronic Engineering, University of Rome Tor Vergata, Via Politecnico 1, 00133 Roma, Italy. palmacci@ing.uniroma2.it.
authors.forename: Massimo
authors.initials: M
authors.lastname: Palmacci
authors.affiliation: Department of Electronic Engineering, University of Rome Tor Vergata, Via Politecnico 1, 00133 Roma, Italy. martinelli@ing.uniroma2.it.
authors.forename: Eugenio
authors.initials: E
authors.lastname: Martinelli
authors.affiliation: Department of Chemical Science and Technology, University of Rome Tor Vergata, Via della Ricerca Scientifica, 00133 Roma, Italy. roberto.paolesse@uniroma2.it.
authors.forename: Roberto
authors.initials: R
authors.lastname: Paolesse
authors.affiliation: Department of Electronic Engineering, University of Rome Tor Vergata, Via Politecnico 1, 00133 Roma, Italy. dinatale@uniroma2.it.
authors.forename: Corrado
authors.initials: C
authors.lastname: di Natale
keywords: ZnO; gas sensor arrays; nanoparticles; porphyrins