Metal coverage on single-wall carbon nanotubes : metal nanoring and nanotube formation
Author
Bağcı, V. M. Kemal
Advisor
Çıracı, Salim
Date
2002Publisher
Bilkent University
Language
English
Type
ThesisItem Usage Stats
64
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views
26
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downloads
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
Nanotubescarbon
metal coverage
metal ring
metal tube
binding
ab-initio electronic structure
Permalink
http://hdl.handle.net/11693/15786Collections
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