Abstract
Structure and composition of arrays of vertically aligned multi-walled carbon nanotubes grown by continuous injection chemical vapor deposition method were studied using the high resolution transmission electron microscopy combined with energy dispersion spectrometry. A portion of injected Fe catalyst was found in the form of nanosized single crystalline particles with a variety of the structures of α-Fe(C), γ-Fe(C) and orthorhombic Fe3C phases encapsulated in the carbon nanotube channel or incorporated into the carbon nanotube wall. A thorough analysis revealed not only the lattice expansion of the γ-Fe(C) phase due to incorporation of carbon atoms but also a monoclinic distortion of the cubic lattice with orts c > a = b and square base transformed into a rhombic one. The monoclinic lattice distortion was referred to the uniaxial symmetry of the encapsulating tube. No evident coherency was observed in the atomic arrangement at the interface between Fe particle and inner shell of the carbon tube, as well as in the atomic arrangement of neighboring graphene shells of the carbon nanotube wall, meaning that the chirality of the shells is not coherent.
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Chechenin, N.G., Chernykh, P.N., Vorobyeva, E.A. et al. Structure phases of fe nanoparticles in vertically aligned multi-walled carbon nanotubes. J. Surf. Investig. 9, 1044–1055 (2015). https://doi.org/10.1134/S1027451015050237
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DOI: https://doi.org/10.1134/S1027451015050237