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Nanotubes de carbone monoparois dans des conditions extrêmes de pression et de température

Abstract : To study the evolution of single wall carbon nanotubes (SWNT) under high pressure and high temperature, Raman spectroscopy and X-ray absorption spectroscopy measurements have been performed. Some experiments have also been done to explore the possibility to synthesise new carbon phases using doped nanotubes as precursor material. This PhD thesis is divided in two parts. The first one is about Raman spectroscopy of SWNT under pressure up to 40 GPa in diamond anvil cell. We have followed the evolution of the resonant character of the tubes under pressure using two excitating wavelengths (632.8 nm and 514.5 nm). Our results clearly demonstrate that a progressive loss of resonance occurs under pressure. The resonant character is totally lost for pressure higher than 20 GPa. The effects of the batch of the SWNT and the choice of the pressure transmitting media have also been studied. In the second part iodine doped SWNT were studied. Raman spectroscopy experiments in diamond anvil cell and X-ray absorption spectroscopy in Paris Edinburgh press measurements have been performed. We have also done high pressure high temperature syntheses (14.5 GPa, 1500_C) on iodine doped SWNT in a multi-anvils press. The analysis of the resulting products has confirmed that doped SWNT can be promising precursors for the synthesis of new carbon phases.
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Contributor : Alexandre Merlen Connect in order to contact the contributor
Submitted on : Wednesday, November 16, 2005 - 8:25:40 PM
Last modification on : Monday, September 6, 2021 - 2:08:01 PM
Long-term archiving on: : Friday, April 2, 2010 - 10:12:45 PM


  • HAL Id : tel-00011014, version 1




Alexandre Merlen. Nanotubes de carbone monoparois dans des conditions extrêmes de pression et de température. Physique [physics]. Université Claude Bernard - Lyon I, 2005. Français. ⟨tel-00011014⟩



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