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Dynamic catalyst restructuring during carbon nanotube growth

: Moseler, M.; Cervantes-Sodi, F.; Hofmann, S.; Csanyi, G.; Ferrari, A.C.


ACS nano 4 (2010), Nr.12, S.7587-7595
ISSN: 1936-0851
ISSN: 1936-086X
Fraunhofer IWM ()

We study the restructuring of solid nickel catalyst nanoparticles during carbon nanotube growth by environmental transmission electron microscopy and multiscale modeling. Our molecular dynamics/continuum transport calculations of surface-diffusion-mediated restructuring are in quantitative agreement with the experimentally observed catalyst shape evolutions. The restructuring time scale is determined by reduced Ni diffusion through the stepped Ni-C interface region where the catalyst surface strongly anchors to the growing nanotube.