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Determining the interwall spacing in carbon nanotubes by using transmission electron microscopy
Karlstad University, Faculty of Health, Science and Technology (starting 2013). (Krister Svensson)
2016 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesisAlternative title
Undersökning av väggavstånden i kolnanorör med hjälp av transmissions-elektronmikroskopi (Swedish)
Abstract [en]

The interwall spacing of multi-walled carbon nanotubes has an effect on their physical and chemical properties. Tubes with larger interwall spacing - compared to the spacing where the carbon atoms are in their natural distance to each other - are for instance expected to be mechanically less stable. Considering the MWCNT interwall spacing’s dependence on the tube size, three interesting previous studies with slightly different conclusions can be found. All of them conclude an increase of the interwall spacing with a decreasing tube size. We describe their analysis procedure, compare them to each other and to our own measured data. In the beginning of our analyses, we determine the expected inaccuracy for measured distances out of TEM images being up to 10 % and we show the impacts of the TEM’s defocus, a powerful setting in TEM imaging. Finally, we suppose that the interwall spacings are not as strongly varying as one previous study concludes, but our analyses are relatively in harmony with the two other studies. The interwall spacings from tubes with an inner diameter larger than 5 nm are relatively constant within the whole tube. Furthermore, it appears that the middle spacings (excluding the outer- and innermost ones) show values that are most consistent with the interlayer spacings of turbostratic graphite. In underfocused images, the outer- and innermost spacings tend to have values being slightly smaller than the middle ones from the same tube. 

Place, publisher, year, edition, pages
2016. , 58 p.
Keyword [en]
MWCNT Multiwall Carbon Nanotubes Interwall Interlayer Spacing TEM Transmission Electron Microscopy Defocus
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kau:diva-45754OAI: oai:DiVA.org:kau-45754DiVA: diva2:958047
Presentation
2016-06-08, Karlstad University, 656 36 Karlstad, 10:00 (English)
Supervisors
Examiners
Available from: 2016-09-07 Created: 2016-09-05 Last updated: 2016-09-07Bibliographically approved

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