Gas microsensors with metalloporphyrin-functionalized carbon nanotube networked layers

M. Penza, R. Rossi, M. Alvisi, D. Valerini, G. Cassano, E. Serra, R. Paolesse, E. Martinelli, C. Di Natale, A. D'Amico

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Abstract

Networked carbon nanotubes (CNTs) films have been grown by chemical vapor deposition (CVD) technology onto miniaturized Co-coated alumina substrates for NO2and NH3gas sensing applications, at a sensor temperature of 150°C. The sidewalls of the CNTs films have been modified by spray-coating with two different metalloporphyrins (MPPs) consisting of a TetraPhenylPorphyrin coordinated by a central metal of zinc (Zn-TPP) and manganese (Mn-TPP) for enhanced sensitivity and tailored specificity. It was demonstrated that the gas sensitivity of the MPPs-modified CNTs-sensors significantly improved by a factor up to four-times through a catalytic effect of the MPPs. The gas sensing properties of CNTs-sensors, including MPPs-modified CNTs, are characterized by a change of the electrical conductivity in a model of charge transfer with a semiconducting p-type character. A response of the CNTs-sensor functionalized with 2 spray-layers of Mn-TPP has been measured as 0.43% to 0.5 ppm NO2, and as 0.09% to 10 ppm NH3, at 150°C. The MPPs-functionalized CNTs-sensors exhibit high sensitivity, fast response, reversibility, good repeatability, sub-ppm range detection limit. © 2011 Springer Science+Business Media B.V.
Original languageEnglish
DOIs
Publication statusPublished - 2011
Externally publishedYes
Event15th Italian Conference on Sensors and Microsystems, AISEM 2010 - , Italy
Duration: 1 Jan 2011 → …

Conference

Conference15th Italian Conference on Sensors and Microsystems, AISEM 2010
CountryItaly
Period1/1/11 → …

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All Science Journal Classification (ASJC) codes

  • Industrial and Manufacturing Engineering

Cite this

Penza, M., Rossi, R., Alvisi, M., Valerini, D., Cassano, G., Serra, E., ... D'Amico, A. (2011). Gas microsensors with metalloporphyrin-functionalized carbon nanotube networked layers. Paper presented at 15th Italian Conference on Sensors and Microsystems, AISEM 2010, Italy. https://doi.org/10.1007/978-94-007-1324-6_15