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Hidden features of the catalyst nanoparticles favorable for single-walled carbon nanotube growth
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10.1063/1.2730730
/content/aip/journal/apl/90/16/10.1063/1.2730730
http://aip.metastore.ingenta.com/content/aip/journal/apl/90/16/10.1063/1.2730730
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Figures

Image of FIG. 1.
FIG. 1.

(Color) (a) Evolution of melting point of Fe and Fe:Mo supported catalysts during nanotube growth, measured by DSC. (b) Hydrogen concentration (normalized) evolution during SWCNT growth, with , obtained with a mass spectrometer. The insets correspond to experiments with sequential introduction of and gas, for (b1) 3 and 17, (b2) 7 and 13, and (b3) 10 and , respectively.

Image of FIG. 2.
FIG. 2.

(Color) (a) Raman spectra for SWCNTs grown on using: (a1) of (blue line) and of (red line), (a2) of followed by of , (a3) of followed by 13 of min and (a4) of followed by of (solid line), and of followed by of (dashed line). (b) Raman spectra for SWCNTs grown on catalyst using (b1) of (blue line) and of (red line), (b2) of followed by of , and (b3) of followed by of . The insets are magnifications showing the “ band.” (c) Schematic of two possible paths for SWCNT growth termination: for pure Fe catalyst (gray arrow) through formation of solid stable carbide phases followed by coating of the catalyst surface by disordered carbon, and for bimetallic catalyst (blue arrow) through coating of catalyst surface with disordered carbon.

Image of FIG. 3.
FIG. 3.

(Color) (a) Side view of Al-terminated surface and cluster of Fe atoms used for the calculations. (b) Ab initio interaction (black squares) and Morse potential fit (solid red line) for three layers of adsorbed Fe. The energy is normalized over the number of atoms per layer. (c) Melting point as function of the diameter for pure Fe nanoparticles. The number of Fe atoms in the particles is shown. The black and red dashed lines represent interpolations for the free and supported clusters, respectively. (d) Phase diagrams, versus in atomic percent (%), for supported particles of size , 100, 200, and 1000. Carbon concentration is defined as .

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/content/aip/journal/apl/90/16/10.1063/1.2730730
2007-04-20
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Hidden features of the catalyst nanoparticles favorable for single-walled carbon nanotube growth
http://aip.metastore.ingenta.com/content/aip/journal/apl/90/16/10.1063/1.2730730
10.1063/1.2730730
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