Chemical vapor deposition of multi-walled carbon nanotubes from nickel/yttria-stabilized zirconia catalysts |
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| Authors: | A.S. Ferlauto D.Z. de Florio F.C. Fonseca V. Esposito R. Muccillo E. Traversa L.O. Ladeira |
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| Affiliation: | (1) Departamento de Física, Universidade Federal de Minas Gerais, Av. Antônio Carlos 6627, 31270-901 Belo Horizonte, MG, Brazil;(2) Instituto de Química, UNESP, R. Prof. Francisco Degni, 14801-970 Araraquara, SP, Brazil;(3) Instituto de Pesquisas Energéticas e Nucleares, Travessa R 400, 05508-170 São Paulo, SP, Brazil;(4) Dipartimento di Scienze e Tecnologie Chimiche, Università di Roma “Tor Vergata”, Via della Ricerca Scientifica, 00133 Rome, Italy |
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| Abstract: | Multi-walled carbon nanotubes (MWNT) were produced by chemical vapor deposition using yttria-stabilized zirconia/nickel (YSZ/Ni) catalysts. The catalysts were obtained by a liquid mixture technique that resulted in fine dispersed nanoparticles of NiO supported in the YSZ matrix. High quality MWNT having smooth walls, few defects, and low amounts of by-products such as amorphous carbon were obtained, even from catalysts with large Ni concentrations (>50 wt. %). By adjusting the experimental parameters, such as flux of the carbon precursor (ethylene) and Ni concentration, both the MWNT morphology and the process yield could be controlled. The resulting YSZ/Ni/MWNT composites can be interesting due to their mixed ionic-electronic transport properties, which could be useful in electrochemical applications. PACS 61.46.Fg; 81.15.Gh; 82.45.Jn |
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