A strategy to control the chirality of single-walled carbon nanotubes

Zhu, Hongwei; Suenaga, Kazu; Wei, Jinquan; Wang, Kunlin; Wu, Dehai

doi:10.1016/j.jcrysgro.2008.09.174

Cited by 67 publications

(54 citation statements)

References 31 publications

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“…Interestingly, the graphene structure shown in Figure 9 is extremely similar to those in experimental results recently published. 35, 36 Next, the procedure just described was repeated; from the relaxed system with two carbon chains, four carbon atoms were added, but this time in a different location: almost above the second terrace layer in the middle of both relaxed carbon chains (Figure 10a,b). After optimization, the system formed a curved carbon structure, shown in Figure 10c,d; this carbon structure has the form of a horizontally aligned semi-nanotube, which may be the beginning of other types of nanotube growth, for example, the formation of horizontally aligned SWCNTs on substrates, as recently reported.…”

Section: Formation Of Carbon Structuresmentioning

confidence: 99%

Growth of Carbon Structures on Stepped (211)Co Surfaces

2009

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Density functional theory is used to evaluate the adsorption of carbon on stepped (211) cobalt surfaces. It is found that the 4-fold step hollow sites on (100) planes are the most stable adsorption sites for carbon, followed by the 3-fold hcp sites located in (111) terraces where adsorption per carbon atom is 0.7-0.9 eV less stable than that on the step sites. When the carbon concentration over the surface increases, adsorption of carbon chains is also favorable, and at even higher carbon pressures, interaction of adsorbed chains may lead to the formation of graphene sheets parallel to the (100) plane or to the formation of horizontally aligned seminanotubes. Formation of these carbon structures is accompanied by oxidation of the cobalt atoms, especially those forming the 4-fold step hollow site, whereas cobalt terrace sites become negatively charged. We discuss the significance of our results in relation to the catalyzed growth of single-walled carbon nanotubes on cobalt nanoparticles.

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Section: Formation Of Carbon Structuresmentioning

confidence: 99%

Growth of Carbon Structures on Stepped (211)Co Surfaces

2009

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“…For example, depression of the melting point of catalytic-metal nanoparticles has been widely discussed [23][24][25][26] since the control of the phase of metal nanoparticles is considered to be one of the key factors to control the diameter and chirality of the carbon nanotubes [27][28][29][30]. In particular, Shiozawa and co-workers [29] examined a growth condition of the metal-catalyzed growth of inner tubes at the hollow space inside single-walled carbon nanotubes (SWNTs) by encapsulating organometallic compounds into the SWNTs and revealed there is a correlation between the melting point of catalytic-metal nanoparticles and the diameter of the inner tubes, which is explained using the Gibbs-Thomson effect.…”

Section: Introductionmentioning

confidence: 99%

Melting and solidification point of fcc-metal nanoparticles with respect to particle size: A molecular dynamics study

Shibuta

Suzuki

2010

Chemical Physics Letters

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“…This finding is important not only since the the metal- carbon interface determines the relative orientation of the CNT and the crystallographic orientation of the catalyst particle. The carbon-metal interface also affects the chirality of the outgrowing CNT [33][34][35].…”

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confidence: 99%