On-chip purification via liquid immersion of arc-discharge synthesized multiwalled carbon nanotubes

Matti J. Hokkanen, Saara Lautala, Dongkai Shao, Tuomas Turpeinen, Juha Koivistoinen, Markus Ahlskog (Corresponding Author)

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)

Abstract

Arc-discharge synthesized multiwalled carbon nanotubes (AD-MWNT) have been proven to be of high quality, but their use is very limited due to difficulties in obtaining them in a clean and undamaged form. Here, we present a simple method that purifies raw AD-MWNT material in laboratory scale without damage, and that in principle can be scaled up. The method consists of depositing raw AD-MWNT material on a flat substrate and immersing the substrate slowly in water, whereby the surface tension force of the liquid–substrate contact line selectively sweeps away the larger amorphous carbon debris and leaves relatively clean MWNTs on the substrate. We demonstrate the utility of the method by preparing clean individual MWNTs for measurement of their Raman spectra. The spectra exhibit the characteristics of high-quality tubes free from contaminants. We also show how one concomitantly with the purification process can obtain large numbers of clean suspended MWNTs.
Original languageEnglish
Article number634
Number of pages8
JournalApplied Physics A: Materials Science and Processing
Volume122
DOIs
Publication statusPublished - Jul 2016
MoE publication typeNot Eligible

Fingerprint

Multiwalled carbon nanotubes (MWCN)
arc discharges
purification
Discharge (fluid mechanics)
submerging
Purification
carbon nanotubes
chips
Liquids
Substrates
liquids
Amorphous carbon
debris
Debris
leaves
contaminants
Surface tension
Raman scattering
interfacial tension
Impurities

Keywords

  • contact line
  • amorphous carbon
  • detachment force

Cite this

Hokkanen, Matti J. ; Lautala, Saara ; Shao, Dongkai ; Turpeinen, Tuomas ; Koivistoinen, Juha ; Ahlskog, Markus. / On-chip purification via liquid immersion of arc-discharge synthesized multiwalled carbon nanotubes. In: Applied Physics A: Materials Science and Processing. 2016 ; Vol. 122.
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On-chip purification via liquid immersion of arc-discharge synthesized multiwalled carbon nanotubes. / Hokkanen, Matti J.; Lautala, Saara; Shao, Dongkai; Turpeinen, Tuomas; Koivistoinen, Juha; Ahlskog, Markus (Corresponding Author).

In: Applied Physics A: Materials Science and Processing, Vol. 122, 634, 07.2016.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Hokkanen, Matti J.

AU - Lautala, Saara

AU - Shao, Dongkai

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AU - Koivistoinen, Juha

AU - Ahlskog, Markus

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AB - Arc-discharge synthesized multiwalled carbon nanotubes (AD-MWNT) have been proven to be of high quality, but their use is very limited due to difficulties in obtaining them in a clean and undamaged form. Here, we present a simple method that purifies raw AD-MWNT material in laboratory scale without damage, and that in principle can be scaled up. The method consists of depositing raw AD-MWNT material on a flat substrate and immersing the substrate slowly in water, whereby the surface tension force of the liquid–substrate contact line selectively sweeps away the larger amorphous carbon debris and leaves relatively clean MWNTs on the substrate. We demonstrate the utility of the method by preparing clean individual MWNTs for measurement of their Raman spectra. The spectra exhibit the characteristics of high-quality tubes free from contaminants. We also show how one concomitantly with the purification process can obtain large numbers of clean suspended MWNTs.

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