Electronic structure of Pd nanoparticles on carbon nanotubes

Felten, A.; Bittencourt, C.; Liang, D.; Hecq, M.; Drube, W.; Van Tendeloo, G.; Pireaux, J.-J.; Ghijsen, J.; Johnson, R. L.

doi:10.1016/j.micron.2008.01.013

Journal Article

Electronic structure of Pd nanoparticles on carbon nanotubes

Felten, A. ; Ghijsen, J. ; Pireaux, J.-J. ; Drube, W. ; Johnson, R. L. ; Liang, D. ; Hecq, M. ; Van Tendeloo, G. ; Bittencourt, C. ; DESY

2009
Elsevier New York, NY [u.a.]

Micron 40, 79 (2009) [10.1016/j.micron.2008.01.013]

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Please use a persistent id in citations: doi:10.1016/j.micron.2008.01.013

Abstract: The effect of the oxygen plasma treatment on the electronic states of multi-wall carbon nanotubes (MWCNTs) is analyzed by X-ray photoemission measurements (XPS) and UPS, both using synchrotron radiation. It is found that the plasma treatment effectively grafts oxygen at the CNT-surface. Thereafter, the interaction between evaporated Pd and pristine or oxygen plasma-treated MWCNTs is investigated. Pd is found to nucleate at defective sites, whether initially present or introduced by oxygen plasma treatment. The plasma treatment induced a uniform dispersion of Pd clusters at the CNT-surface. The absence of additional features in the Pd 3d and C 1s core levels spectra testifies that no Pd-C bond is formed. The shift of the Pd 3d core level towards high-binding energy for the smallest clusters is attributed to the Coulomb energy of the charged final state.

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