Direct evidence for the existence of multi-walled carbon nanotubes with hexagonal cross-sections
Van Tendeloo, Gustaaf
Carbon nanotubes (CNTs) with a polygonal cross-section have been paid increasing attention since their three-dimensional structure is related to specific physical properties, which are found to be different in comparison to CNTs with a circular cross-section. Here, we report the existence of novel multi-walled CNTs yielding walls with a rounded-hexagonal configuration. This structure was directly confirmed for the first time by both cross-sectional transmission electron microscopy and electron tomography. The morphology of the Fe catalytic particle also exhibits hexagonal characteristics, and is proposed as the origin of the formation of the rounded-hexagonal walls of the CNT. This observation is of great importance with respect to the design of polygonal (such as pentagonal or hexagonal) cross-sectional CNTs. By controlling the morphology of the catalytic nanoparticles it will be possible to grow CNTs with desired electronic and mechanical properties.
Carbon. - Oxford
50:7(2012), p. 2524-2529
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Faculty of Sciences. Physics
Electron microscopy for materials research (EMAT)
ESMI - European Soft Matter Infrastructure.
Counting Atoms in Nanomaterials (COUNTATOMS).
Development of discrete tomography for transmission electron microscopy: 3D imaging of interfaces in ceramic and semiconducting multilayers.
A1 Journal article
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