Effect of the Growth Temperature on the Diameter Distribution and Chirality of Single-Wall Carbon Nanotubes

Bandow, Shunji; Asaka, Shuji; Saito, Yahachi; Rao, Apparao M.; Grigorian, L.; Richter, Ernst; Eklund, P. C.

doi:10.1103/physrevlett.80.3779

Cited by 802 publications

(492 citation statements)

References 6 publications

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“…Besides the CVD case, the DWNT produced in arc discharge also fit Eq. 1 well, which may indicate that the effective growth temperature in arc discharge does not exceed 2,000 K. Although precise data for Co-MCM41 and laser ablation are not readily available, the semiquantitative data on hand (26,29) show an abundance of SWNT with large , as the theory here predicts. It should be noted that we focus on the steady-state growth of the tube, when Ϸ99.9% of its body is built, and do not consider the nucleation period, which may possibly discriminate among the CNT types, due to variation in formation energy between the tube and catalyst (3) or preference to certain tube-caps (13).…”

Section: Resultssupporting

confidence: 51%

“…1 predicts a greater length of nearly armchair tubes relative to rather short and slower growing zigzag. To characterize the tube distribution experimentally it is necessary to unbundle the ropes by sonication (24)(25)(26)(27)(28)(29), in the process breaking the tubes into smaller fragments. Because of the fragmentation, greater length translates into a greater number of fragments, i.e., larger abundance.…”

Section: Resultsmentioning

confidence: 99%

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Dislocation theory of chirality-controlled nanotube growth

Ding

Harutyunyan

Yakobson

2009

Proc. Natl. Acad. Sci. U.S.A.

308

374

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The periodic makeup of carbon nanotubes suggests that their formation should obey the principles established for crystals. Nevertheless, this important connection remained elusive for decades and no theoretical regularities in the rates and product type distribution have been found. Here we contend that any nanotube can be viewed as having a screw dislocation along the axis. Consequently, its growth rate is shown to be proportional to the Burgers vector of such dislocation and therefore to the chiral angle of the tube. This is corroborated by the ab initio energy calculations, and agrees surprisingly well with diverse experimental measurements, which shows that the revealed kinetic mechanism and the deduced predictions are remarkably robust across the broad base of factual data.carbon ͉ catalysis ͉ kinetics ͉ nucleation ͉ synthesis

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Section: Resultssupporting

confidence: 51%

Section: Resultsmentioning

confidence: 99%

Dislocation theory of chirality-controlled nanotube growth

Ding

Harutyunyan

Yakobson

2009

Proc. Natl. Acad. Sci. U.S.A.

308

374

View full text Add to dashboard Cite

show abstract

“…[24][25][26][27][28] The peaks present for the annealed sample suggest that the nanotube diameter in the sample range from 1.13 to 1.53 nm, with an average size of 1.33 nm. This is calculated with d ) 234/ν, 29 where d is the tube diameter in nanometers and ν is in wavenumbers. Figure 6 presents UV-vis-near-IR spectra of SWNTs suspended in a 0.15 wt % Triton-X/D 2 O solution.…”

Section: Resultsmentioning

confidence: 99%

Purification and Characterization of Single-Wall Carbon Nanotubes (SWNTs) Obtained from the Gas-Phase Decomposition of CO (HiPco Process)

et al. 2001

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A purification method has been developed that provides for the removal of metal catalysts and impurity carbon from laser-oven-grown single-wall carbon nanotube (SWNT) material. The oxidation rate of SWNTs in air at elevated temperatures is correlated to the metal content of the sample. Sample purity is documented with SEM, TEM, electron microprobe analysis, Raman, and UV-vis-near-IR. We also note that the relative intensity of the electronic transitions in the near-infrared to the continuum absorption at 400 nm in the UV serves as a useful monitor of the perturbation of the sidewall π-electron density of SWNTs due to sidewall substitution and/or oxidation.

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“…The high temperature enhances the activity of the metal catalyst. This results in nanotube diameter increase at a higher temperature [102]. However, it was demonstrated that CNT growth is controlled by both the availability of proper precursors and the activity of the catalytic metal particles rather than temperature [103].…”

Section: Laser Ablationmentioning

confidence: 99%

Carbon nanotubes for ultrafast fibre lasers

et al. 2016

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Carbon nanotubes (CNTs) possess both remarkable optical properties and high potential for integration in various photonic devices. We overview, here, recent progress in CNT applications in fibre optics putting particular emphasis on fibre lasers. We discuss fabrication and characterisation of different CNTs, development of CNTbased saturable absorbers (CNT-SA), their integration and operation in fibre laser cavities putting emphasis on stateof-the-art fibre lasers, mode locked using CNT-SA. We discuss new design concepts of high-performance ultrafast operation fibre lasers covering ytterbium (Yb), bismuth (Bi), erbium (Er), thulium (Tm) and holmium (Ho)-doped fibre lasers.

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Effect of the Growth Temperature on the Diameter Distribution and Chirality of Single-Wall Carbon Nanotubes

Cited by 802 publications

References 6 publications

Dislocation theory of chirality-controlled nanotube growth

Dislocation theory of chirality-controlled nanotube growth

Purification and Characterization of Single-Wall Carbon Nanotubes (SWNTs) Obtained from the Gas-Phase Decomposition of CO (HiPco Process)

Carbon nanotubes for ultrafast fibre lasers

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