N-doped carbon nanofibers from pyrolysis of free-base phthalocyanine
Date
2020
Authors
Basiuk, Vladimir A.
Bolivar-Pineda, Lina M.
Meza-Laguna, Victor
Glushenkov, Alexey
Basiuk, Elena V.
Murdoch, Billy J.
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier
Abstract
Heating free-base phthalocyanine (H2Pc) at around 450 °C under static vacuum results in the formation of a
nonvolatile carbonaceous material through oxidative pyrolysis. We used a number of instrumental techniques to
characterize its morphology and chemical composition. According to electron microscopy observations, the
dominating morphology is fibrous. The estimated length of individual fibers, which appear as rather homogeneous and continuous structures, is several micrometers, with diameters of roughly 200 nm. According to
elemental analysis estimates, the per cent contribution of carbon remains approximately the same as in pristine
H2Pc, but about 5.4 at% of nitrogen is substituted by oxygen. Spectroscopic measurements suggest that the
oxygen is incorporated into nanofiber structure in the form of different functionalities containing C]O and
C–OH bonds. Raman spectroscopy revealed an approximately equal contribution due to sp3 and sp2
-hybridized
carbon atoms, which would made one to expect that the thermal stability of nanofibers must be similar to that of
defect-containing nanotubes, graphene oxide and nanodiamond. Nevertheless, according to thermogravimetric
curves obtained, nanofibers are at least as thermally stable as graphene and defect-free nanotubes. Density
functional theory calculations were employed to suggest possible initial steps of H2Pc oxidative pyrolysis leading
to the formation of nanofibers.
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Diamond and Related Materials
Type
Journal article
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2037-12-31
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