Chemical treatment of carbon nanotubes

Esumi, K.; Ishigami, Masa; Nakajima, Akira; Sawada, Kaichiro; Honda, Hiroaki

doi:10.1016/0008-6223(96)83349-5

Cited by 381 publications

(198 citation statements)

References 7 publications

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“…This method, based on a treatment in concentrated HNO 3 or mixtures of H 2 SO 4 and HNO 3 , is generally used to attach functional groups to the defects on CNTs. 23,25,48 For example, acid functionalization of MWCNTs (i.e. COOH grafting) leads to improved MWCNT solubility in water allowing for homogeneous and stable dispersions.…”

Section: Resultsmentioning

confidence: 99%

Monitoring oxidation of multiwalled carbon nanotubes by Raman spectroscopy

Osswald

Havel

Gogotsi

2007

J Raman Spectroscopy

550

364

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Multiwalled carbon nanotubes (MWCNTs) were oxidized in air and acids while varying the treatment time and/or temperature. The goal of this approach was to create the highest density of carboxyl groups with moderate sample loss, which is necessary for nanocomposite applications. In situ Raman experiments allowed real-time observation of the structural changes in MWCNTs upon oxidation. The ratio of the Raman intensities of the D and G bands was used to estimate the concentration of defects. It was found that while an oxidation for 6 h in H 2 SO 4 /HNO 3 provided the strongest effect, a 'flash oxidation' in air (15 min at 550°C) also leads to an efficient functionalization in a cost-effective and environmentally friendly way. Transmission electron microscopy, Fourier-transform infrared (FTIR) spectroscopy, thermogravimetric analysis and electrophoretic mobility analysis were used to study the oxidized nanotubes.

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Section: Resultsmentioning

confidence: 99%

Monitoring oxidation of multiwalled carbon nanotubes by Raman spectroscopy

Osswald

Havel

Gogotsi

2007

J Raman Spectroscopy

550

364

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“…The production of a suspension of SWCNT into a base fluid is not a straightforward process, as the SWCNT tend to agglomerate and settle with time. Thus, it was necessary to perform a chemical activation on the bulk SWCNT, based on the procedure described by Esumi et al, 24 and applied previously to produce stable water suspensions of SWCNT. The suspension was prepared with 1g of SWCNT in 40 ml of a mixture of HNO 3 and H 2 SO 4 (1:3 volume ratio) or HNO 3 and refluxed at 140°C.…”

Section: Methodsmentioning

confidence: 99%

Deposition of Carbon Nanotube Films on Polyamide and Polypropylene Substrates: A Computer Simulation Approach

et al. 2016

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In this work we study hydroxylated carbon nanotube (CNT) assembly on polyamide (PA) and polypropylene (PP) polymers activated by UV radiation from a theoretical and experimental perspective. Molecular computer simulation was done to understand the stable conformations and bulk properties (molecular dynamics) of the polymers before and after exposure to UV radiation at the molecular level. Our experiments suggest that PA presents more -OH active groups, producing a more hydrophilic surface, whereas PP exhibits less potential UV activation. These results suggest that it is possible a facile covalent functionalization method to tune organic polymer surface properties through SWCNT anchoring for nanotechnological applications requiring defined surface roughness and chemical functionality on inexpensive polymers.

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“…A mixture of concentrated nitric and sulfuric acids in a molar ratio of 1:3, respectively was taken [27]. MWNTs were added to the acid mixture in an appropriate ratio and the mixture was refluxed for 20 min.…”

Section: Synthesis Of Mwnts Using the Cvd Methods And Subsequent Purifmentioning

confidence: 99%

Comparison of structure and yield of multiwall carbon nanotubes produced by the CVD technique and a water assisted method

Bansal

Lal

Srivastava

et al. 2010

Physica B: Condensed Matter

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Multiwall carbon nanotubes (MWNTs) were synthesized using chemical vapor deposition (CVD) technique and a water assisted method. Both methods produced MWNTs. which were characterized by SEM. TEM and Raman studies. It was observed that as far as quality is concerned. MWNTs produced by water assisted method are superior as the method does not employ any metal catalyst. However, as far as yield is concerned. CVD is a better method. Multiwall carbon nanotubes produced by water assisted method suffer from the drawback of low yield but have an advantage of production of multiwall carbon nanotubes without using any metal catalyst. at ambient pressure, in an environment friendly manner and using a simple and cost-effective apparatus.

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Chemical treatment of carbon nanotubes

Cited by 381 publications

References 7 publications

Monitoring oxidation of multiwalled carbon nanotubes by Raman spectroscopy

Monitoring oxidation of multiwalled carbon nanotubes by Raman spectroscopy

Deposition of Carbon Nanotube Films on Polyamide and Polypropylene Substrates: A Computer Simulation Approach

Comparison of structure and yield of multiwall carbon nanotubes produced by the CVD technique and a water assisted method

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