MWCNT-Pt nanocomposite as the active element of harmful gas sensors
Journal Title: Archives of Materials Science and Engineering - Year 2016, Vol 81, Issue 1
Abstract
Purpose: The goal of this paper is presentation of the variations in MWCNTs-Ptnanocomposite resistance which were examined in the presence of hydrogen with a risingconcentration of, respectively, 1, 2, 3 and 4% H2 as well as nitrogen dioxide with a risingconcentration of, respectively, 20, 100, 200, 400 ppm of NO2.Design/methodology/approach: Variations in electrical conductivity for the MWCNTs-Ptcomposite placed, alternately, in the atmosphere of gas and in the atmosphere of selectedgases, were measured with a measuring station equipped with precision and inert gasreducers, mass flow meters, filtration systems of gas mixture and the studied mixture’shumidity and temperature control. An active layer of the transducer consisted of MWCNTs-Pt nanocomposite deposited thereon. All the measurements were carried out in theatmosphere of synthetic air (20% of O2 and 80% of N2) at 22.5°C.Findings: It was found based on the results obtained that system resistance is rising ashydrogen concentration is rising in the atmospheric air. The results of analogous examinationsof variations in MWCNTs-Pt nanocomposite resistance carried out for a varying concentrationof nitrogen dioxide in the atmosphere of synthetic air are opposite, because lowering systemresistance was noted along with a heightening concentration of NO2. The best results wereachieved for the nanocomposite presented in the article having a 5% mass concentration ofplatinum and with uniformly dispersed Pt particles on the surface of carbon nanoparticles.Practical implications: The outcomes presented signify the selectiveness of the appliedsystem consisting of carbon nanotubes decorated with platinum nanoparticles. It meansthat this material can be used as the active element of harmful gas sensors.Originality/value: A carbon-metal MWCNTs-Pt nanocomposite with special electricalproperties was fabricated in the course of research works, whose originality is based on theappropriately selected composition and the specific morphology.
Authors and Affiliations
A. D. Dobrzańska-Danikiewicz, D. Łukowiec, W. Wolany, M. Procek, A. Sękala
Keywords
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