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Critical role of the acetylene content and Fe/C ratio on the thickness and density of vertically aligned carbon nanotubes grown at low temperature by a one-step catalytic chemical vapor deposition process

Antoine Combrisson 1 Emeline Charon 1, * Mathieu Pinault 1 Cécile Reynaud 1 Martine Mayne-L’hermite 1 
* 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 present work explores the role of the carbon source content and the Fe/C ratio on the synthesis of vertically aligned carbon nanotubes (VACNTs) by one-step aerosol-assisted CCVD operated at a medium temperature (615 °C) on aluminum substrates. The main objective was to overcome the limitations of VACNT growth, constituting a drawback for applications requiring thick VACNTs. By using acetylene as carbon feedstock and ferrocene as a catalyst precursor, we demonstrate that when acetylene content is reduced to 1.5 vol%, it is possible to grow VACNT carpets up to 700 µm thick while maintaining constant VACNT growth for a long duration (up to 160 min). The carbon conversion yield is significantly improved when the acetylene content reaches 1.5 vol%. The Al surface roughness also influences VACNT growth. An optimum Fe/C ratio of 0.8 wt.% coupled with a low acetylene content gives the highest growth rate (5.4 µm/min) ever reported for a thermal aerosol-assisted CCVD process operated at such a low temperature. The CNT number density can be controlled by varying the Fe/C ratio, enabling high density growth (e.g., 1.3 × 10$^{11}$ CNT/cm$^2$).
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https://hal-cea.archives-ouvertes.fr/cea-03818565
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Submitted on : Tuesday, October 18, 2022 - 8:48:49 AM
Last modification on : Thursday, October 20, 2022 - 3:32:00 AM

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Antoine Combrisson, Emeline Charon, Mathieu Pinault, Cécile Reynaud, Martine Mayne-L’hermite. Critical role of the acetylene content and Fe/C ratio on the thickness and density of vertically aligned carbon nanotubes grown at low temperature by a one-step catalytic chemical vapor deposition process. Nanomaterials, 2022, 12 (14), pp.2338. ⟨10.3390/nano12142338⟩. ⟨cea-03818565⟩

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