Kinetics of Water-Assisted Single-Walled Carbon Nanotube Synthesis Revealed by a Time-Evolution Analysis

Futaba, Don N.; Hata, Kenji; Yamada, Takeo; Mizuno, Kohei; Yumura, Motoo; Iijima, Sumio

doi:10.1103/physrevlett.95.056104

Cited by 331 publications

(419 citation statements)

References 13 publications

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“…69 From the SI it is very likely that peaks g to i correspond to semiconducting (E 22 S excitonic transition energy) species, with the most likely chiral assignments being g 272 cm À1 (8,4), h 290 cm À1 (9,2), and i 303 cm À1 (6,5). Peaks d to f correspond to metallic (E 11 M ) species, with some possible chiral assignments being d 216 cm À1 (8,8), (12,3), or (13,1), e 228 cm À1 (9,6), and f 236 cm À1 (10,4). Peaks b and c correspond either to metallic (E 11 M ) or semiconducting (E 33 S ) species, and chiral assignments are uncertain because of the crowding of different possibilities in the Kataura plot.…”

Section: Resultsmentioning

confidence: 99%

Type- and Species-Selective Air Etching of Single-Walled Carbon Nanotubes Tracked with in Situ Raman Spectroscopy

2013

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The thermal oxidation of carbon nanotubes in air is investigated by in situ Raman spectroscopy. Etching rates are directly seen to be diameter, chirality, and type dependent. We directly track the evolution of bundled nanotube networks that undergo air etching from 300 to 600 °C. Some species are more robust than others. Changes to radial breathing mode (RBM) and G– peak structures suggest that metallic species etch away more rapidly, with smaller diameter semiconducting species etching more slowly and large diameter nanotubes, including semiconductors, etching last. The decay in integrated G and D band intensities is tracked and fit reasonably well with biexponential decay. The RBM evolution is better represented by a single exponential. All bands are fit to activation plots with RBMs showing significantly different rates.

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Section: Resultsmentioning

confidence: 99%

Type- and Species-Selective Air Etching of Single-Walled Carbon Nanotubes Tracked with in Situ Raman Spectroscopy

2013

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“…Millimeter tall forests of SWNTs and/or MWNTs (multi-walled carbon nanotubes) are now regularly synthesized [1,3,[5][6][7][8][9][10][11][12][13][14][15][16][17] and research has shifted focus from how nanotube growth is initiated to the increasingly important question of how nanotube growth terminates [15,18,19]. Several reports demonstrate that nanotube forests grow at an initially rapid rate which drops off either gradually [7,20,21] or suddenly [15,22,23]. Because nanotube forests are attached to a substrate and grown in such abundance, process monitoring can be as simple as making in situ videos of forest growth [4,21,22,24,25].…”

Section: Introductionmentioning

confidence: 99%

Distinct termination morphologies for vertically aligned carbon nanotube forests

et al. 2009

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Distinct termination morphologies for vertically aligned carbon nanotube forests Vinten, P.; Marshall, P.; Lefebvre, J.; Finnie, P.Contact us / Contactez nous: nparc.cisti@nrc-cnrc.gc.ca. Abstract Vertically aligned carbon nanotube forests, including single-walled nanotubes, are imaged optically as they grow in situ from cobalt/alumina catalyst using water-assisted acetylene chemical vapor deposition. Three distinct termination morphologies are identified and investigated optically and via scanning electron microscopy. Quantitative growth dynamics are extracted and show gradual deceleration and sudden termination of growth. The termination morphology is discussed in terms of the balance of forces within the forest. We speculate that sudden termination is a collective effect arising from an imbalance in these forces.

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“…The diameter of a CNT depends on the number of layers and can be controlled by processing methods. [8][9][10][11] As previously shown in other reports, the diameter and length of CNTs are often on the order of 10 nm and 100 mm, respectively. At present, vapor-grown carbon fiber (VGCF) is a new class of carbon fiber that is distinct from other types of carbon fibers because of its production method.…”

Section: Introductionmentioning

confidence: 48%

The rheological behavior and thermal conductivity of melt-compounded polycarbonate/vapor-grown carbon fiber composites

Nithikarnjanatharn

Ueda

Tanoue

et al. 2012

Polym J

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The effect of polycarbonate (PC) matrix viscosity on the thermal conductivity of a PC/vapor-grown carbon fiber (VGCF) composite was investigated in this study in terms of the rheological properties of the PC/VGCF using two types of VGCF. Two types of VGCF, which have different aspect ratios (VGCF-h has an aspect ratio of 40, whereas VGCF-s has an aspect ratio of 100), were added to two types of PC with different viscosities. The storage modulus (G¢) and loss modulus (G 00 ) of the PC slightly increased and thermal conductivity gradually increased with the content of VGCF-h. By adding VGCF-s to low-viscosity PC, rheological properties originating in the network structure were observed. Thermal conductivity of low-viscosity PC drastically increased with the content of VGCF-s. By analyzing the length of VGCF in each composite, we found that the length of VGCF decreased with mixing. It was also easy to shorten VGCF in high-viscosity PC. We clarified that the thermal conductivity of PC/VGCF could be controlled with the viscosity of the polymer matrix because the spread of the network structure of VGCF and/or the breaking of VGCF depended on the viscosity of the polymer matrix.

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Kinetics of Water-Assisted Single-Walled Carbon Nanotube Synthesis Revealed by a Time-Evolution Analysis

Cited by 331 publications

References 13 publications

Type- and Species-Selective Air Etching of Single-Walled Carbon Nanotubes Tracked with in Situ Raman Spectroscopy

Type- and Species-Selective Air Etching of Single-Walled Carbon Nanotubes Tracked with in Situ Raman Spectroscopy

Distinct termination morphologies for vertically aligned carbon nanotube forests

The rheological behavior and thermal conductivity of melt-compounded polycarbonate/vapor-grown carbon fiber composites

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