Etchant-induced shaping of nanoparticle catalysts during chemical vapour growth of carbon nanofibres - Archive ouverte HAL Access content directly
Journal Articles Carbon Year : 2011

Etchant-induced shaping of nanoparticle catalysts during chemical vapour growth of carbon nanofibres

(1) , (1) , (1) , (1) , (2) , (3) , (1)
1
2
3

Abstract

Carbon nanofibres (CNFs) obtained by plasma enhanced chemical vapour deposition are made of cone-shaped graphene layers, the opening angle of which has a significant influence on their properties: the smaller the angle, the closer the properties to those of carbon nanotubes. That angle is determined by the shape of the metal nanoparticle used to catalyse the growth. We show in this paper that the shape of Ni nanoparticle catalysts, and in turn the CNF properties, can be tuned during plasma-enhanced chemical vapour deposition, by the choice of the etchant gas. We show in particular that a water-containing etchant (H2O or H2O+H2) increases the growth rate by an order of magnitude at 600°C compared to an ammonia-containing etchant (NH3 or NH3+H2), and leaves more elongated Ni particles with a cone angle three times smaller. We conclude that the cone angle and the growth rate are directly related, and propose a mechanism to explain that large difference between the two etchants.
Fichier principal
Vignette du fichier
2010Carbon_He.pdf (874.78 Ko) Télécharger le fichier
Vignette du fichier
2010Carbon_He_SupplementaryData.pdf (280.45 Ko) Télécharger le fichier
Origin : Files produced by the author(s)
Origin : Files produced by the author(s)
Loading...

Dates and versions

hal-00525194 , version 1 (11-10-2010)

Identifiers

Cite

Z. B. He, Jean-Luc Maurice, C. S. Lee, A. Gohier, P. Legagneux, et al.. Etchant-induced shaping of nanoparticle catalysts during chemical vapour growth of carbon nanofibres. Carbon, 2011, 49, pp.435. ⟨10.1016/j.carbon.2010.09.040⟩. ⟨hal-00525194⟩
126 View
342 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More