Structure phases of fe nanoparticles in vertically aligned multi-walled carbon nanotubes
| Autor: | D.I. Vainshtein, P. N. Chernykh, E. A. Vorobyeva, N.G. Chechenin, J.Th.M. De Hosson, M. V. Dutka |
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| Rok vydání: | 2015 |
| Předmět: |
Materials science
Carbon nanofiber Graphene Mechanical properties of carbon nanotubes Carbon nanotube Surfaces Coatings and Films law.invention Carbon nanotube quantum dot Optical properties of carbon nanotubes Condensed Matter::Materials Science Crystallography Chemical engineering law High-resolution transmission electron microscopy Monoclinic crystal system |
| Zdroj: | Journal of Surface Investigation. X-ray, Synchrotron and Neutron Techniques. 9:1044-1055 |
| ISSN: | 1819-7094 1027-4510 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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