Effect of ultraviolet light irradiation on macroscopic single-walled carbon nanotube bundles

We have measured the electrical conductivity and the Young modulus of macroscopic oriented ropes containing single-walled carbon nanotubes under ultraviolet (UV) irradiation. We found that UV irradiation increases both the electrical conductivity and the strength of the macroscopic bundle. These phe...

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Bibliographic Details
Published in:Applied physics letters 2006-04, Vol.88 (15)
Main Authors: Mikó, Cs, Milas, M., Seo, J. W., Gaál, R., Kulik, A., Forró, L.
Format: Article
Language:English
Subjects:
CARBON
ELECTRIC CONDUCTIVITY
ELECTRON BEAMS
FORMAMIDE
IRRADIATION
MATERIALS SCIENCE
NANOTUBES
RADICALS
SOLVENTS
SURFACES
TRANSMISSION ELECTRON MICROSCOPY
ULTRAVIOLET RADIATION
YOUNG MODULUS
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Summary:We have measured the electrical conductivity and the Young modulus of macroscopic oriented ropes containing single-walled carbon nanotubes under ultraviolet (UV) irradiation. We found that UV irradiation increases both the electrical conductivity and the strength of the macroscopic bundle. These phenomena are explained by the generation of cross-links between the tubes in the macroscopic bundle due to the UV-induced interaction between the solvent dimethyl-formamide and the free radicals present on the surface of carbon nanotubes. Transmission electron microscopy investigation shows that the wall structure of nanotubes is preserved during this process, which is a valuable advantage compared to electron irradiation.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.2195013