Physics – Condensed Matter – Materials Science
Scientific paper
2008-10-28
Physics
Condensed Matter
Materials Science
16 pages, 5 figures; submitted to the Proceedings of 21st International Symposium on Superconductivity, Tsukuba, Japan, Octobe
Scientific paper
We have synthesized a large amount of boron-doped multiwalled carbon nanotubes (MWNTs) by hot-filament chemical vapor deposition. The synthesis was carried out in a flask using a methanol solution of boric acid as a source material. The scanning electron microscopy, transmission electron microscopy, and micro-Raman spectroscopy were performed to evaluate the structural properties of the obtained MWNTs. In order to evaluate the electrical properties, temperature dependence of resistivity was measured in an individual MWNTs with four metal electrodes. The Ramman shifts suggest carrier injection into the boron-doped MWNTs, but the resistivity of the MWNTs was high and increased strongly with decreasing temperature. Defects induced by the plasma may cause this enhanced resistivity.
Ishii Shihoko
Nagao Makoto
Takano Yasushi
Tsuda Shunsuke
Watanabe Ta.
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