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      • Theses - Department of Physics
      • Dept. of Physics - Master's degree
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      Metal coverage on single-wall carbon nanotubes : metal nanoring and nanotube formation

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      Author
      Bağcı, V. M. Kemal
      Advisor
      Çıracı, Salim
      Date
      2002
      Publisher
      Bilkent University
      Language
      English
      Type
      Thesis
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      Abstract
      The carbon nanotubes are welcomed as the basis element for electronic and opto-electronic devices of nanometers size, the size of a few atoms. The question of crucial importance in the physics of utilization of nanotubes as nanowires, transistors, couplers etc. is the metal-nanotube interactions. In this thesis, we considered the problem of metal coverage of nanotubes and single atom-metal interactions, using the first-principles computational techniques. We had found that Ti, Fe and Ni bind strongly to the nanotube while Al, Cu and Au has weak binding. We propose that d orbital electrons of transition metal elements play important role in the strong interactions. We also observed that strong metalmetal interaction prevents uniform coverage of nanotube, however a stable ring and tube of aluminum atoms with well defined patterns can also form around the semiconducting SWNT’s and lead to metallization. We have obtained a criteria for the uniform coverage of nanotubes by metal atoms.
      Keywords
      Nanotubes
      carbon
      metal coverage
      metal ring
      metal tube
      binding
      ab-initio electronic structure
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      http://hdl.handle.net/11693/15786
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      • Dept. of Physics - Master's degree 160
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