Abstract
The growth of carbon nanotubes (CNTs) under a controlled electric field in a chemical vapor deposition system is investigated. We evaluate the influence of this external field on the morphological and structural characteristics of CNTs. Scanning electron microscopy results display a large presence of carbonaceous material in the positive plate, which appear to be a consequence of the attraction of electric forces over the electronically unbalanced cracked carbon molecules in the heating zone. We also observe a growth behavior for CNTs, in which catalyst particles are localized either at the bottom or the upper part of the nanotube, depending on the intensity and direction of the electric field. A Raman analysis from all obtained carbon materials shows the presence of two peaks, corresponding to the D ~ 1340 cm−1 and G ~ 1590 cm−1 bands attributed to multiwall CNTs. The average diameter of the CNTs is in the range between 90 and 40 nm. These results provide experimental evidence for the dependence of the catalyst and subtract interaction on the growing mechanism, in which weak chemical or electronic interactions could stimulate a top-growing as the strongest base-growing process.
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Acknowledgments
The authors thank to “Fondo Nacional de Ciencia y Tecnologia” (FONACIT) and “Ley Organica de Ciencia Tecnologia e Inovación” (LOCTI) resources by mean of the National Strategic Project No. 2011000375, to support this work and L. Sigalotti for his review.
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Plaza, E., Briceño-Fuenmayor, H., Arévalo, J. et al. Electric field effect in the growth of carbon nanotubes. J Nanopart Res 17, 246 (2015). https://doi.org/10.1007/s11051-015-3055-9
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DOI: https://doi.org/10.1007/s11051-015-3055-9