Recent investigations in nanotechnology show that carbon nanotubes (CNT) have one of the most significant mechanical, electrical and optical properties. Interactions
between those areas like electrical, optical and mechanical properties are also very promising in both research and industrial fields. Those unique characteristics are
built by mainly the atomistic structure of the carbon nanotubes.
In this thesis, the effects of vacant atoms on single walled carbon nanotubes (SWCNT) are investigated using matrix stiffness method. In order to use this
technique a linkage between structural mechanics and molecular mechanics is established. A code has been developed to construct the SWCNT with the desired
chirality, extracting the vacant atoms with the corresponding atomic bonds between the neighbor nodes and calculating the effect of those vacancies on its vibrational
properties. A finite element software is also utilized for validation of the code and results.
In order to investigate the convergence of the effect of those vacant nodes a numerous number of analyses have been carried out with randomly positioned vacant
atoms. Also consecutive vacant nodes have been positioned in order to investigate the effect on the structural properties through the length of a CNT. In addition to those, as a case study, the reduction in Young' / s modulus property
because of the vacancies has also been investigated and the effects are tabulated in
the report.
It is concluded in this study that the any amount of vacant atoms have substantial effect on modal frequencies and Young' / s modulus. Chirality and the position of the
vacancies are the main parameters determining the structural properties of a CNT.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/3/12611550/index.pdf |
| Date | 01 February 2010 |
| Creators | Dogan, Ibrahim Onur |
| Contributors | Yazicioglu, Yigit |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | M.S. Thesis |
| Format | text/pdf |
| Rights | To liberate the content for public access |
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