Laser heating method for estimation of carbon nanotube purity

Терехов, С. В.; Obraztsova, E. D.; Lobach, A. S.; Konov, V. I.

doi:10.1007/s003390201285

Cited by 29 publications

(29 citation statements)

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“…Raw SWNT materials contained 15-20% of nanotubes (diameter distribution was 1.46 nm ± 0.15 nm) and were not pre-purified [7]. The following calixarenes were used in this work: сalix [4]resorcinarene aminomethylated on the lower rim (1) [8], phosphorylated aminomethylated calix [4]resorcinarene (2) [4], p-sulfonatocalix [4]arene modified by butyl substituents (3) [6] and p-sulfonato-calix [6]arene modified by dodecyl substituents (4) [6].…”

Section: Methodsmentioning

confidence: 99%

Solubilization of single‐wall carbon nanotubes in aqueous solutions of calixarenes

Лобач

Рыжкина

Spitsina

et al. 2007

Physica Status Solidi (b)

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The present work reports the studies of the solubilization of single-wall carbon nanotubes in aqueous solutions of calix[4]resorcinarene derivatives and p-sulfonato-calix[n]arenes (n = 4, 6) modified by alkyl (butyl and dodecyl) substituents. The highest dispersion ability is demonstrated by calix[4]resocinarene, which bears aminomethyl groups on the upper rim and phosphorus-bearing alkyl fragments on the lower rim of calixarene. Optical absorption spectroscopy justifies the formation of stable suspensions of SWNT in aqueous solutions of calixarenes.

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Section: Methodsmentioning

confidence: 99%

Solubilization of single‐wall carbon nanotubes in aqueous solutions of calixarenes

Лобач

Рыжкина

Spitsina

et al. 2007

Physica Status Solidi (b)

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“…On the basis of Raman spectroscopy a new method of carbon nanotube purity estimation has been developed by E. Obraztsova and co-workers [22]. In this method the spectra of carbon soot containing different amounts of nanotubes are registered under heating from a probing laser beam with step-by-step increased power density.…”

Section: Raman Scatteringmentioning

confidence: 99%

Perspectives of Single-Wall Carbon Nanotube Production in the Arc Discharge Process

Крестинин¹,

Киселев²,

Raevskii³

et al. 2017

Eurasian Chem. Tech. J.

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Single-wall carbon nanotubes (SWNTs) promise wide applications in many technical fields. As a result purified SWNT material is sold now on the West market at more than $1000 per 1 gram. Thus developing an effective technology for SWNTs production rises to a very important scientific problem. The perspectives of three existing methods providing raw material in the technology of SWNT production have been analyzed. They are i) pulsed laser evaporation of graphite/metal composites, ii) evaporation of graphite electrodes with metal content in the arc discharge process, and iii) catalytic decomposition of the mixture of CO and metal carbonyl catalyst precursor. The observed dynamics of SWNT market points to replacing the laser method of SWNTs production by the arc process. The conclusion has been made that the technology based on the arc process will be the major one for the fabrication of purified SWNTs at least for the next five years. A reliable estimation of a low price limit of SWNTs was derived from a comparison of two technologies based on the arc discharge process: the first one is the production of SWNTs and the second one is the production of a fullerene mixture С 60 + С 70 . The main conclusion was made that the price of purified SWNTs should always be more by 2-3 times the price of fullerene mixture. The parameters of a lab-scale technology for the production of purified SWNTs are listed. A large-scale application of the developed technology is expected to reduce the price of purified SWNTs by approximately ten times. The methods now employed for the characterization of products containing SWNTs are briefly observed. It is concluded that electron microscopy, thermogravimetric analysis, absorption and Raman spectroscopy, measurement of the specific surface aria, optical microscopy -each in separation is not enough for extensive characterization of a sample containing SWNTs, and all these methods should be used together.

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“…Characterization of CNTs is most often done using Raman spectroscopy. However, interpretation of results is not a trivial task since laser irradiation may lead to certain irreversible Raman-observable effects on single-walled tubes (SWCNTs), such as degassing of adsorbed species [1], ablation of carbonaceous impurities and/or annealing effects [2][3][4] or destruction of certain classes of nanotubes [2,[5][6][7]. Concerning destruction of CNTs, different authors have shown that small diameter tubes [2] or metallic tubes [1,6] are more sensitive to irradiation effects.…”

mentioning

confidence: 98%

Stability of carbon nanotubes to laser irradiation probed by Raman spectroscopy

Olevik

Солдатов

Dossot

et al. 2008

Physica Status Solidi (b)

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We report on a systematic study of the influence of laser irradiation on the Raman spectra of HiPco‐produced single‐wall CNTs. Specifically, we have examined the Raman response of bundled CNTs to: i) laser power density; ii) exposure time and iii) photon energy (1.96 and 2.33 eV). Our results show that irreversible destruction of CNTs in the bundles can occur at even low laser power density (0.15 kW/cm2). The tubes with smaller diameters are influenced first and the rate of CNT destruction increases with photon energy. Finally, we determined that when investigating destruction of CNT bundles, the use of a low laser power density is required because changes in the structure of the bundles can lead to sample temperature changes for otherwise identical measurement parameters. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Laser heating method for estimation of carbon nanotube purity

Cited by 29 publications

References 0 publications

Solubilization of single‐wall carbon nanotubes in aqueous solutions of calixarenes

Solubilization of single‐wall carbon nanotubes in aqueous solutions of calixarenes

Perspectives of Single-Wall Carbon Nanotube Production in the Arc Discharge Process

Stability of carbon nanotubes to laser irradiation probed by Raman spectroscopy

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