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Pt-TiO2/MWCNTs Hybrid Composites for Monitoring Low Hydrogen Concentrations in Air
Department of Mechanics and Materials, University of Reggio Calabria, 89124 Reggio Calabria, Italy
Department of Chemical Science and Technologies, University of Rome Tor Vergata, 00133 Roma, Italy
Department of Matter Physics and Electronic Engineering, University of Messina, 98166 Messina, Italy
Department of Industrial Chemistry and Materials Engineering, University of Messina, 98166 Messina, Italy
* Author to whom correspondence should be addressed.
Received: 24 August 2012; in revised form: 5 September 2012 / Accepted: 7 September 2012 / Published: 10 September 2012
Abstract: Hydrogen is a valuable fuel for the next energy scenario. Unfortunately, hydrogen is highly flammable at concentrations higher than 4% in air. This aspect makes the monitoring of H2 leaks an essential issue for safety reasons, especially in the transportation field. In this paper, nanocomposites based on Pt-doped TiO2/multiwalled carbon nanotubes (MWCNTs) have been introduced as sensitive materials for H2 at low temperatures. Pt-TiO2/MWNTs nanocomposites with different composition have been prepared by a simple wet chemical procedure and their morphological, microstructural and electrical properties were investigated. Resistive thick-film devices have been fabricated printing the hybrid nanocomposites on alumina substrates provided with Pt interdigitated electrodes. Electrical tests in air have shown that embedding MWCNTs in the TiO2 matrix modify markedly the electrical conductivity, providing a means to decrease the resistance of the sensing layer. Pt acts as a catalytic additive. Pt-TiO2/MWNTs-based sensors were found to be sensitive to hydrogen at concentrations between 0.5 and 3% in air, satisfying the requisites for practical applications in hydrogen leak detection devices.
Keywords: hydrogen sensor; TiO2; MWCNTs; hybrid nanocomposites
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Trocino, S.; Donato, A.; Latino, M.; Donato, N.; Leonardi, S.G.; Neri, G. Pt-TiO2/MWCNTs Hybrid Composites for Monitoring Low Hydrogen Concentrations in Air. Sensors 2012, 12, 12361-12373.
Trocino S, Donato A, Latino M, Donato N, Leonardi SG, Neri G. Pt-TiO2/MWCNTs Hybrid Composites for Monitoring Low Hydrogen Concentrations in Air. Sensors. 2012; 12(9):12361-12373.
Trocino, Stefano; Donato, Andrea; Latino, Mariangela; Donato, Nicola; Leonardi, Salvatore Gianluca; Neri, Giovanni. 2012. "Pt-TiO2/MWCNTs Hybrid Composites for Monitoring Low Hydrogen Concentrations in Air." Sensors 12, no. 9: 12361-12373.