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Etude par microscopie électronique en transmission de la germination et de la croissance des nanotubes de carbone synthétisés à moyenne température

Abstract : Single-wall carbon nanotubes can grow from nanoparticles either by high temperature processes (> 3000°C), or low temperature processes (< 1200°C). In this thesis we tried to answer a few questions about the growth mechanism of carbon nanotubes synthetized by chemical vapour deposition. We tented to understand the link between some parameters' synthesis and the change in the yield of few walls carbon nanotubes using a transmission electron microscope and its analysing tools. We have been studying the different stages of growth and identified indirectly the growth but also the destruction phenomena. Trough this study we deduce as well the role of hydrogen, already known by nanotubes' growth community, but also the role of an underlay of titanium. Besides, for the first time, this work shows that tangential and parallel nucleation and growth on nanoparticles smaller than 5 nm are often possible.
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https://tel.archives-ouvertes.fr/tel-00439903
Contributor : Marie-Faith Fiawoo <>
Submitted on : Tuesday, December 8, 2009 - 10:20:07 PM
Last modification on : Friday, June 26, 2020 - 2:01:07 PM
Long-term archiving on: : Thursday, June 17, 2010 - 7:19:31 PM

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  • HAL Id : tel-00439903, version 1

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Marie-Faith Fiawoo. Etude par microscopie électronique en transmission de la germination et de la croissance des nanotubes de carbone synthétisés à moyenne température. Physique [physics]. Université Paris Sud - Paris XI, 2009. Français. ⟨tel-00439903⟩

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