Large-scale synthesis and characterization of helically coiled carbon nanotubes by use of Fe(CO)₅ as floating catalyst precursor

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Hou, Haoqing ; Zeng, Jun ; Weller, Frank ; Greiner, Andreas:
Large-scale synthesis and characterization of helically coiled carbon nanotubes by use of Fe(CO)₅ as floating catalyst precursor.
In: Chemistry of Materials. Bd. 15 (2003) Heft 16 . - S. 3170-3175.
ISSN 1520-5002
DOI: https://doi.org/10.1021/cm021290g

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Abstract

Helically shaped multiwalled carbon nanotubes (HCNTs) (diameter 30-80 nm) were obtained as main products in large quantities by co-pyrolysis of Fe(CO)(5) as floating catalyst precursor and pyridine or toluene as carbon source at temperatures above 1000 degreesC under flow of hydrogen. In contrast, pyrolysis at 700-800 degreesC yielded only carbon-coated Fe nanoparticles. The HCNTs were characterized by electron microscopy, Raman spectroscopy, and wide-angle X-ray diffraction. The growth mechanism of the HCNTs was discussed on the basis of previously reported models.