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Sensors 2017, 17(4), 747; doi:10.3390/s17040747

Conductive Photo-Activated Porphyrin-ZnO Nanostructured Gas Sensor Array

1
Department of Electronic Engineering, University of Rome Tor Vergata, Via Politecnico 1, 00133 Roma, Italy
2
Department of Chemical Science and Technology, University of Rome Tor Vergata, Via della Ricerca Scientifica, 00133 Roma, Italy
*
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M.N. Passaro
Received: 30 January 2017 / Revised: 23 March 2017 / Accepted: 30 March 2017 / Published: 1 April 2017
(This article belongs to the Special Issue State-of-the-Art Sensors Technologies in Italy 2016)
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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. View Full-Text
Keywords: gas sensor arrays; porphyrins; ZnO; nanoparticles gas sensor arrays; porphyrins; ZnO; nanoparticles
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Magna, G.; Catini, A.; Kumar, R.; Palmacci, M.; Martinelli, E.; Paolesse, R.; di Natale, C. Conductive Photo-Activated Porphyrin-ZnO Nanostructured Gas Sensor Array. Sensors 2017, 17, 747.

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