# One-step synthesis of highly pure and well-crystallized vertically aligned carbon nanotubes

* Corresponding author
1 LEDNA - Laboratoire Edifices Nanométriques
NIMBE UMR 3685 - Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M)
Abstract : The one-step aerosol-assisted catalytic chemical vapor deposition (CCVD) process, when operated in a H$_2$-based carrier gas, is shown to be effective at an extremely low ferrocene content (0.1wt.% in toluene), which enables to efficiently prepare forests of vertically aligned multiwalled carbon nanotubes (VACNTs) with high purity and good crystalline level. The resulting iron content in VACNT sample is only 0.5wt.% corresponding to a high catalytic yield of 200 while the steady growth rate (20 $\mu$m/min) is maintained at a significant value. The iron content in the sample is found proportional to the ferrocene concentration in the precursor, and when it decreases, a noticeable reduction in the iron encapsulation frequency in the nanotube channel is plainly observed. Lowering the ferrocene concentration generates a reduction in the VACNT number density while the growth rate increases and CNT diameters and crystalline structure remain similar. Such significant purity and crystalline levels involves a high oxidation resistance of the VACNT forest. These results, together with the in-situ continuous growth feature of the one-step aerosol assisted CCVD process, open up towards a new VACNT range made of pure and well-crystallized multi-walled carbon nanotubes, which is of interest for industrial production and commercial applications.
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Cited literature [70 references]

https://hal-cea.archives-ouvertes.fr/cea-03002425
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Submitted on : Thursday, November 12, 2020 - 6:30:48 PM
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Emeline Charon, Mathieu Pinault, Martine Mayne-L’hermite, Cécile Reynaud. One-step synthesis of highly pure and well-crystallized vertically aligned carbon nanotubes. Carbon, 2020, 173, pp.758-768. ⟨10.1016/j.carbon.2020.10.056⟩. ⟨cea-03002425⟩

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