Abstract
We present the first results on the interface between carbon nanotube (CNT) and metal by cross-sectional high-resolution transmission electron microscopy and spatially resolved electron energy loss spectroscopy on Fe-filled CNTs. The iron core is mainly single crystalline $\ensuremath{\alpha}\text{\ensuremath{-}}\mathrm{Fe}$. Under specific orientation relationships, a semicoherent CNT/Fe interface forms, where local lattice mismatch is accommodated by ``interface dislocations.'' A $0.2--0.4\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$ energy shift of the $\ensuremath{\pi}*$ peak of the carbon $K$-edge towards higher values is found at the interface. The results prove experimentally an interfacial bonding between the CNT wall and Fe.
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