Purification of Single Wall Carbon Nanotubes Using Gelatin

Takahashi, Terüo; Tsunoda, Katsunori; Yajima, Hirofumi; Ishii, Tadahiro

doi:10.1143/jjap.43.1227

Cited by 7 publications

(12 citation statements)

References 23 publications

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“…The Raman spectrum of each of the SWNTs consists of the three prominent bands that are assigned to the radial breathing mode (RBM, 100-300 cm À1 ), the disordered band (D-band, 1340 cm À1 ), and the tangential mode (G-band, around 1590 cm À1 ). These Raman features are the same as those of the SWNTs obtained from the SWNT-gelatin dispersion liquids presented in the previous paper, 18,19) where a detailed interpretation of each of the Raman bands has been described. The R-SWNTs exhibited broad RBM bands, which was ascribed to the existence of various species of SWNTs with a wide distribution of diameters [ Fig.…”

Section: Resultssupporting

confidence: 53%

“…The TG and DTG curves exhibited behavior similar to those of the SWNT-gelatin dispersion systems. 18,19) Appreciable weight loss at around 350 C and 440 C in the R-SWNTs is probably attributed to the burning of the amorphous carbon and the SWNTs, respectively. 22) The existence of the amorphous carbon and carbon nanoparticles was not indicated in the TG curve of the A-SWNTs [ Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The content of metals drastically decreased with the progress of the purification steps: approximately 45 wt% for the R-SWNTs, 12 w% for the D-SWNTs, and 3 wt% for the P-SWNTs at the final step. Therefore, the purification procedure for the SWNTs with gelatin 18,19) was confirmed to be considerably and satisfactorily improved by using CMC as the dispersing agent.…”

Section: Resultsmentioning

confidence: 99%

“…18,19) The advantage of using gelatin as a dispersing reagent is not only that it is useful for untangling the SWNT bundles, but also that the gelatin molecule and the metallic catalyst are easily removed using HCl. Moreover, we have explored some biopolymers which can more effectively untangle SWNT bundles.…”

Section: Introductionmentioning

confidence: 99%

“…It should be noted that the CMC-SWNT dispersion liquids remained homogeneous and stable for a few months, and the dispersion capability of CMC for SWNTs was greater than that of gelatin. 18,19) This behavior is attributed to the electrostatic repulsion between the anionic CMC chains surrounding the SWNTs in aqueous liquid. This hypothesis is supported by the measured results of -potential values, that is, À57:9 mV for C-SWNTs and À26:3 mV for G-SWNTs.…”

Section: Introductionmentioning

confidence: 99%

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Dispersion and Purification of Single-Wall Carbon Nanotubes Using Carboxymethylcellulose

Takahashi

Tsunoda

Yajima

et al. 2004

Jpn. J. Appl. Phys.

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We have developed a novel method for the purification of single-wall carbon nanotubes (SWNTs) that involves annealing in air and dispersing the SWNTs in an aqueous solution of carboxymethylcellulose (CMC). The purity of the resulting SWNTs was evaluated by analytical techniques such as electron microscopy, Raman spectroscopy, and thermogravimetric analysis (TGA). As a result, it was revealed that CMC functioned as an effective dispersion reagent in the exfoliation of the SWNT bundles and thereby, SWNTs with appreciably high quality were prepared.

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Section: Resultssupporting

confidence: 53%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Dispersion and Purification of Single-Wall Carbon Nanotubes Using Carboxymethylcellulose

Takahashi

Tsunoda

Yajima

et al. 2004

Jpn. J. Appl. Phys.

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Effective Nondestructive Purification of Single-Walled Carbon Nanotubes Based on High-Speed Centrifugation with a Photochemically Removable Dispersant

et al. 2014

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A purification method for raw single-walled carbon nanotubes (SWCNTs) without damage to their intrinsic structures has been desired in many applications. We investigated the purification of SWCNTs based on high-speed centrifugation of water-dispersed SWCNTs using the photoreactive dispersant we previously investigated. SWCNTs wrapped with the dispersant were separated from impurities, such as an amorphous carbon and metal particles by centrifugation, similarly to conventional physical purification using surfactants. In contrast to general surfactants that form micelles to disperse SWCNTs in aqueous solutions, the photoreactive dispersant did not form micelles. Therefore, an excess amount of the dispersant, which did not adsorb onto the SWCNT surfaces, was removable by dialysis of the supernatant. Since the amount of the dispersant was minimized by dialysis, we tuned the UV-irradiation time to eliminate the dispersibility of SWCNTs in water to as low a value as ∼2 h. The SWCNT precipitates were collected, and their chemical and structural purity were evaluated using thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and resonance Raman spectroscopy. It was found that present methods combining high-speed centrifugation and photoreactive dispersant provided an effective procedure to purify SWCNTs without any apparent changes to their intrinsic properties.

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Nanotube Foam Prepared by Gelatin Gel as a Template

Nabeta

Sano

2005

Langmuir

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It has been known that simply mixing single-walled carbon nanotubes (SWCNTs) in an aqueous solution of gelatin disperses SWCNTs well for a period of months. Gels made from the gelatin-SWCNT mixture are also stable and have a clear, black color. Scanning electron microscopy shows that gelatin molecules self-organize into a foamlike structure. All SWCNTs are embedded in the gelatin film that makes up the foam walls. Those SWCNTs belonging to one face of the foam cell cannot approach other faces to make van der Waals contact. Thus, the foam structure is associated with stabilization of the SWCNT dispersion. The gelatin can be removed thermally while maintaining the foam structure to give a sponge made of nanotube foams. This highly porous solid is electrically conducting and mechanically stable and can be used as a structural frame for composite materials.

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Purification of Single Wall Carbon Nanotubes Using Gelatin

Cited by 7 publications

References 23 publications

Dispersion and Purification of Single-Wall Carbon Nanotubes Using Carboxymethylcellulose

Dispersion and Purification of Single-Wall Carbon Nanotubes Using Carboxymethylcellulose

Effective Nondestructive Purification of Single-Walled Carbon Nanotubes Based on High-Speed Centrifugation with a Photochemically Removable Dispersant

Nanotube Foam Prepared by Gelatin Gel as a Template

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