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Proceedings Paper

Electronic transport modification of single-walled carbon nanotubes by encapsulating alkali-metal ions
Author(s): T. Izumida; G.-H. Jeong; T. Hirata; R. Hatakeyama; Y. Neo; H. Mimura
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Paper Abstract

We have produced alkali-metal encapsulated single-walled carbon nanotubes using a method of alkali-metal plasma ion irradiation. After plasma ion irradiation, alkali-metal encapsulated single-walled carbon nanotubes are sonicated for several hours in N,N-dimethylformamide to make well dispersed solution, then applied on a field-effect transistor substrate. As a result of measurements, pristine semiconducting single-walled carbon nanotubes show p-type conductivity, but Cs-encapsulated single-walled carbon nanotubes show n-type transport properties. This drastic change can be explained by electron transfer from encapsulated Cs atoms toward the surrounding SWNTs. At 11 K, the Coulomb oscillation is observed, implying that an inhomogeneous encapsulation profile of Cs atoms form several quantum dots. Thus, the electronic properties of SWNTs are found to be successfully controlled by plasma ion irradiation.

Paper Details

Date Published: 28 June 2005
PDF: 8 pages
Proc. SPIE 5838, Nanotechnology II, (28 June 2005); doi: 10.1117/12.608575
Show Author Affiliations
T. Izumida, Tohoku Univ. (Japan)
G.-H. Jeong, Tohoku Univ. (Japan)
T. Hirata, Tohoku Univ. (Japan)
R. Hatakeyama, Tohoku Univ. (Japan)
Y. Neo, Shizuoka Univ. (Japan)
H. Mimura, Shizuoka Univ. (Japan)

Published in SPIE Proceedings Vol. 5838:
Nanotechnology II
Paolo Lugli; Laszlo B. Kish; Javier Mateos, Editor(s)

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