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Mark Hermann Rummeli
나노구조물리 연구단
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Microscopic insight into the bilateral formation of carbon spirals from a symmetric iron core

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Title
Microscopic insight into the bilateral formation of carbon spirals from a symmetric iron core
Author(s)
Shiozawa, Hidetsugu; Bachmatiuk, Alicja; Stangl, Andreas; Cox, David C.; Silva, S. Ravi P.; Mark , Hermann Rummeli; Pichler, Thomas
Publication Date
2013-05
Journal
SCIENTIFIC REPORTS, v.3, no., pp.1840 -
Publisher
NATURE PUBLISHING GROUP
Abstract
Mirrored carbon-spirals have been produced from pressured ferrocene via the bilateral extrusion of the spiral pairs from an iron core. A parametric plot of the surface geometry displays the fractal growth of the conical helix made with the logarithmic spiral. Electron microscopy studies show the core is a crystalline cementite which grows and transforms its shape from spherical to biconical as it extrudes two spiralling carbon arms. In a cross section along the arms we observe graphitic flakes arranged in a herringbone structure, normal to which defects propagate. Local-wave-pattern analysis reveals nanoscale defect patterns of two-fold symmetry around the core. The data suggest that the bilateral growth originates from a globular cementite crystal with molten surfaces and the nano-defects shape emerging hexagonal carbon into a fractal structure. Understanding and knowledge obtained provide a basis for the controlled production of advanced carbon materials with designed geometries.
URI
http://pr.ibs.re.kr/handle/8788114/1341
DOI
10.1038/srep01840
ISSN
2045-2322
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
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