Purifying single-walled nanotubes

Tohji, Kazuyuki; Goto, Takashi; Takahashi, Hideyuki; Shinoda, Y.; Shimizu, Nobutaka; Jeyadevan, Balachandran; Matsuoka, Isao; Saito, Yahachi; Kasuya, A.; Ohsuna, Tetsu; Hiraga, Kenji; Nishina, Y.

doi:10.1038/383679a0

Cited by 241 publications

(161 citation statements)

References 9 publications

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“…This left a black puffy paper (buckypaper). This paper was then refluxed in water 22,23 for approximately 2-5 h, depending on the amount of starting material. The water becomes yellowish which suggests further removal of aromatic carboxyl acids.…”

Section: Methodsmentioning

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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Section: Methodsmentioning

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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“…The use of high-temperature oxidation in air is effective in removing amorphous and graphitic contaminants from MWCNTs; for SWCNTs, however, metal catalysts must first be removed before this oxidation step since such metals are known to catalyze the low-temperature oxidation of CNTs (12,13). In principle, the purification of SWCNTs is feasible by using a combination of the following: gas-or vaporphase oxidation; wet-chemical oxidation/treatment; and centrifugation or filtration (including chromatography techniques) (13)(14)(15)(16)(17)(18)(19)(20)(21)(22)(23)(24). These procedures, however, require several steps using special setups and instrumentation at elevated temperatures (800-1,200°C).…”

Section: -Pyrenebutanoic Acid Succinimidyl Ester (Pase)mentioning

confidence: 99%

Purification, Functionalization, and Bioconjugation of Carbon Nanotubes

Luong

Male²,

Mahmoud³

et al. 2011

Methods in Molecular Biology

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Bioconjugation of carbon nanotubes (CNTs) with biomolecules promises exciting applications such as biosensing, nanobiocomposite formulation, design of drug vector systems, and probing protein interactions. Pristine CNTs, however, are virtually water-insoluble and difficult to evenly disperse in a liquid matrix. Therefore, it is necessary to attach molecules or functional groups to their sidewalls to enable bioconjugation. Both noncovalent and covalent procedures can be used to conjugate CNTs with a target biomolecule for a specific bioapplication. This chapter presents a few selected protocols that can be performed at any wet chemistry laboratory to purify and biofunctionalize CNTs. The preparation of CNTs modified with metallic nanoparticles, especially gold, is also described since biomolecules can bind and self-organize on the surfaces of such metal-decorated CNTs.

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“…Tohji et al improved the purity and crystallinity of SWCNTs synthesized by arc discharge and succeeded in obtaining highly pure SWCNTs. 14 Jointly with Iwata et al, he established a method of analyzing the crystallinity of highly crystalline SWCNTs with a high resolution. 15 On the basis of the above achievements, a process for synthesizing highly crystalline CNTs has been gradually established; however, a technique to control the crystallinity of a highly crystalline single CNT has not yet been established.…”

Section: Introductionmentioning

confidence: 99%

Effect of increased crystallinity of single-walled carbon nanotubes used as field emitters on their electrical properties

Shimoi

2015

Journal of Applied Physics

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Single-walled carbon nanotubes (SWCNTs) synthesized by arc discharge are expected to exhibit good field emission (FE) properties at a low driving voltage. We used a coating containing homogeneously dispersed highly crystalline SWCNTs produced by a high-temperature annealing process to fabricate an FE device by a wet-coating process at a low cost. Using the coating, we succeeded in reducing the power consumption of field emitters for planar lighting devices. SWCNTs synthesized by arc discharge have crystal defects in the carbon network, which are considered to induce inelastic electron tunneling that deteriorates the electrical conductivity of the SWCNTs. In this study, the blocking of the transport of electrons in SWCNTs with crystal defects is simulated using an inelastic electron tunneling model. We succeeded in clarifying the mechanism underlying the electrical conductivity of SWCNTs by controlling their crystallinity. In addition, it was confirmed that field emitters using highly crystalline SWCNTs can lead to new applications operating with low power consumption and new devices that may change our daily lives in the future.

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Purifying single-walled nanotubes

Cited by 241 publications

References 9 publications

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

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

Purification, Functionalization, and Bioconjugation of Carbon Nanotubes

Effect of increased crystallinity of single-walled carbon nanotubes used as field emitters on their electrical properties

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