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Probing mechanical properties of carbon nanotubes
Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
2010 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

The purpose with this c-level thesis is to investigate Young’s modulus of carbon nanotubes (CNTs). The force measurements as well as the imaging are done by an atomic force microscope (AFM). This has been done before by Eric W. Wong et al in 19971. These earlier experiments report techniques using clean-room facilities not available at Karlstad University. Our task is to investigate probabilities in which to perform the experiment by using the available instruments at Karlstad University.The force measurements are done by using the AFM tip to push the CNTs. A force curve is obtained from where it is possible to determine the spring constant of the CNT. By knowing some essential characteristics of the cantilever and the tip, Young’s modulus can be calculated. The CNT needs to be fixed in one end and able to push to the sides in the other end. Our main focuses in this thesis is how to fix the CNTs and what surface to use. Essentially two methods of fixing the tubes have been tried out. Partly we have been looking for large particles on the surface lying on top of a CNT fixing one end, partly we have evaporated gold to achieve an edge under which the CNTs can be attached.In conclusion we can say that it is hard and time-consuming looking for CNTs randomly fixed by particles on the surface. Further we can say that the choice of surface is important. A surface with a low friction was desired but the low friction causes trouble during imaging. The force between the tip and the cantilever during imaging seems to be enough to disturb the CNT and the surface, making measurements hard.

Place, publisher, year, edition, pages
2010.
Keyword [en]
Carbon nanotubes, AFM, atomic force microscopy, Young's modulus
National Category
Other Physics Topics
Identifiers
URN: urn:nbn:se:kau:diva-14452Local ID: FYS C-2OAI: oai:DiVA.org:kau-14452DiVA: diva2:543334
Subject / course
Physics
Uppsok
Physics, Chemistry, Mathematics
Supervisors
Examiners
Available from: 2013-08-07 Created: 2012-08-07 Last updated: 2013-08-07Bibliographically approved

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