Optical and electrical characterization of carbon nanoparticles produced in laminar premixed flames |
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Authors: | Gianluigi De Falco,Mario Commodo,Carmela Bonavolontà ,Giovanni Piero Pepe,Patrizia Minutolo,Andrea D&rsquo Anna |
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Affiliation: | 1. Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, Università degli Studi di Napoli Federico II, P.le V. Tecchio 80, 80125 Napoli, Italy;2. Istituto di Ricerche sulla Combustione, CNR, P.le V. Tecchio 80, 80125 Napoli, Italy;3. Dipartimento di Fisica, Università degli Studi di Napoli Federico II, via Cinthia, 80126 Napoli, Italy;4. CNR-SPIN UOS Napoli, Complesso Universitario di Monte Sant’Angelo, via Cinthia, 80126 Napoli, Italy |
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Abstract: | Optical and electrical properties of carbonaceous particles produced in laboratory scale, premixed ethylene/air flames are obtained. Light absorption and Raman spectroscopy show that the change in particle nanostructure follows a graphitization trajectory as the flame richness increases. The optical band gap decreases and the size of the aromatic network in the particle increases, while the interlayer spacing between parallel layers decreases. The electrical conductivity of the materials increases by increasing flame richness in agreement to the graphitization trajectory. A non-ohmic behavior has been found and explained in terms of electron tunneling in a percolative network. Our results show that the electrical properties of flame formed carbon nanoparticles are strongly dependent on their nanostructure, and hence they have to be used carefully for the determination of particle concentration with conductometric sensors. Moreover, the dependence of the electrical properties of combustion formed particles might be useful for the development of cheap sensors for the selective detection of different classes of combustion aerosols. |
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Keywords: | Carbon nanoparticles Optical characteristics Raman Electrical properties |
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