Résumé
We study the interface between carbon nanotubes (CNTs) and surface-deposited titanium using electron microscopy and photoemission spectroscopy, supported by density functional calculations. Charge transfer from the Ti atoms to the nano-tube and carbide formation is observed at the interface which indicates strong interaction. Nevertheless, the presence of oxygen between the Ti and the CNTs significantly weakens the Ti-CNT interaction. Ti atoms at the surface will preferentially bond to oxygenated sites. Potential sources of oxygen impurities are examined, namely oxygen from any residual atmosphere and pre-existing oxygen impurities on the nanotube surface, which we enhance through oxygen plasma surface pre-treatment. Variation in literature data concerning Ohmic contacts between Ti and carbon nanotubes is explained via sample pre-treatment and differing vacuum levels, and we suggest improved treatment routes for reliable Schottky barrier-free Ti-nanotube contact formation.
langue originale | Anglais |
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Pages (de - à) | 1799-1804 |
Nombre de pages | 6 |
journal | ChemPhysChem |
Volume | 10 |
Numéro de publication | 11 |
Les DOIs | |
Etat de la publication | Publié - 3 août 2009 |
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Synthèse, Irradiation et Analyse de Matériaux (SIAM) (2016 - ...)
Louette, P. (!!Manager), Colaux, J. (!!Manager), Felten, A. (!!Manager), Tabarrant, T. (!!Operator), COME, F. (!!Operator) & Debarsy, P.-L. (!!Manager)
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