Formation and growth of carbon nanostructures: fullerenes, nanoparticles, nanotubes and cones

Lozovik, Yurii E.; Popov, Andrey M.

doi:10.3367/ufnr.0167.199707d.0751

Cited by 75 publications

(31 citation statements)

References 195 publications

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“…At the same time, for bond lengths, binding energies, the energy gap between the highest occupied and lowest unoccupied molecular orbitals (HOMO-LUMO gap), potential barrier heights in the Stone-Wales transformation [21], and other characteristics of fullerene C 60 , the tight-binding potential gives values that are in good agreement with experimental data and/or ab initio calculations (for more details, see [19]). Using Eq.…”

supporting

confidence: 62%

Simulation of the thermal fragmentation of fullerene C60

Openov

Подливаев

2006

Jetp Lett.

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The processes of defect formation and annealing in fullerene C 60 at T = (4000 -6000) K are studied by the molecular dynamics technique with a tight-binding potential. The cluster lifetime until fragmentation due to the loss of a C 2 dimer has been calculated as a function of temperature. The activation energy and the frequency factor in the Arrhenius equation for the fragmentation rate have been found to be E a = (9.2 ± 0.4) eV and A = (8 ± 1) · 10 19 s −1 .It is shown that fragmentation can occur after the C 60 cluster loses its spherical shape. This fact must be taken into account in theoretical calculations of E a .

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confidence: 62%

Simulation of the thermal fragmentation of fullerene C60

Openov

Подливаев

2006

Jetp Lett.

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“…Various existing models can be found, for example, in [28]. Because it is only possible to assert that the quantity of carbon atoms necessary for fullerene forming cannot unite simultaneously, the process has a complex nature and consists of a number of consecutive elementary acts, each of them can proceed very quickly.…”

Section: Growth Of Carbon Many-layer Particlesmentioning

confidence: 99%

Nucleation and Growth of Closed Many-Layer Carbon Particles

Berezkin

2001

phys. stat. sol. (b)

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A new model of a structure of closed many-layer carbon particles, their origin and growth is proposed. The model is that single-layer fullerenes being the minimum possible closed particles are nuclei of bigger particles. With structural defects fullerenes take a role of a physical surface on which the carbon concentric layers in the form of deformed and defective carbon networks are deposited. Microcrystallites as areas of coherent X-ray scattering are the flattest regions of several outer particle layers. Experimental data that can justify the model are analyzed. The theoretical expressions for rates and times of the particle growth are obtained. A number of quantitative estimates is made. Possible mechanisms of the particle growth are discussed. It is marked that the process of the particle formation as a gas-solid state phase transition in some features is similar to the crystalline growth from a gas phase. At the same time there are specific features which also are discussed.

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“…It is assumed that fullerenes are their elements of growth [14,15]. The paper [16] separates closed nanosized packages of basal layers into an individual group of nanostructures: onion-like fullerenes.…”

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confidence: 99%

Structural types of boron nitride particles produced by carbothermal synthesis

Oleinik

Lyashenko

Prilutskii

et al. 2011

Powder Metall Met Ceram

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Transmission electron microscopy and microdiffraction are used to examine boron nitride produced by carbothermal synthesis (using saccharose as a carbon-containing component) in the temperature range 1000-1450°C in nitrogen. It is established that onion-like particles form during structural ordering of turbostratic boron nitride in the range 900−1000°C. The structural types of BN particles are classified according to: 1) crystal morphological features (onion-like particles, cylindrical and faceted tubes, and lamellas), 2) formation mechanisms (structures of growth formed through nucleation and structures of breakdown formed through structural transitions), and 3) synthesis temperatures. The tubes grow from the gas phase and their crystal morphological forms differ in phase composition (cylindrical tubes consist of the hexagonal BN phase and faceted tubes of the rhombohedral one). At T ≥ 1350°C, rhombohedral-hexagonal phase transition and transformation into multilayered polytypes occur in faceted tubes due to a highly anisotropic thermal expansion coefficient of graphite-like modifications of boron nitride.

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Formation and growth of carbon nanostructures: fullerenes, nanoparticles, nanotubes and cones

Cited by 75 publications

References 195 publications

Simulation of the thermal fragmentation of fullerene C60

Simulation of the thermal fragmentation of fullerene C60

Nucleation and Growth of Closed Many-Layer Carbon Particles

Structural types of boron nitride particles produced by carbothermal synthesis

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