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@ARTICLE{Ma:203323,
author = {Ma, Yao and Weimer, Christian and Yang, Nianjun and Zhang,
Lei and Staedler, Thorsten and Jiang, Xin},
title = {{L}ow-temperature growth of carbon nanofiber using a
vapor–facet–solid process},
journal = {Materials today / Communications},
volume = {2},
issn = {2352-4928},
address = {Amsterdam [u.a.]},
publisher = {Elsevier},
reportid = {FZJ-2015-05290},
pages = {e55 - e61},
year = {2015},
abstract = {Most carbon nanofibers (CNFs) are grown at temperatures
higher than 700 °C with a chemical vapor deposition (CVD)
process and their growths are explained using the
vapor–liquid–solid (VLS) mechanism. Herein we report the
realization of low temperature growth of CNFs and the
interpretation of their growth with a vapor–facet–solid
(VFS) mechanism. CNFs were synthesized via a thermal CVD
process at the temperature as low as 350 °C and
characterized using elemental analysis, gas
chromatography–mass spectrometry, X-ray photoelectron
spectroscopy, and Raman spectroscopy. They feature unique
structures of partly ordered discontinuous and hydrogen rich
polymer sheets with a diameters of 0.5–1.5 nm. Based on a
trimerization reaction occurring on the Fe catalyst surface,
their initial growth step is the formation of six-membered
rings from the source gas (i.e. C2H2). Subsequently, these
rings act as structural unit and construct various larger
planar molecules. Due to catalytic difference of the
crystalline faces for a given Fe catalyst particle, a
concentration gradient of hydrocarbon molecule introduces
simultaneously. This gradient drives the diffusion of
hydrocarbon molecule from the Fe(1 1 0) to the Fe(1 0 0)
face, leading to the formation of disordered hydrogen-rich
polymer structures. Highly graphitic CNFs can be obtained
simply by annealing those polymer structures at higher
temperatures. This growth mode proposed is workable whenever
transition metal catalyzed nanostructures are synthesized by
a thermal CVD process at low temperatures},
cin = {PGI-5},
ddc = {620},
cid = {I:(DE-Juel1)PGI-5-20110106},
pnm = {143 - Controlling Configuration-Based Phenomena (POF3-143)},
pid = {G:(DE-HGF)POF3-143},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000364735200008},
doi = {10.1016/j.mtcomm.2014.12.003},
url = {https://juser.fz-juelich.de/record/203323},
}