Ion irradiation effects on conduction in single-wall carbon nanotube networks |
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| Authors: | V Skákalová AB Kaiser Z Osváth G Vértesy LP Biró S Roth |
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| Institution: | (1) Max Planck Institute for Solid State Research, Heisenbergstr. 1, 70569 Stuttgart, Germany;(2) MacDiarmid Institute for Advanced Materials and Nanotechnology, SCPS, Victoria University of Wellington, P.O. Box 600, Wellington, New Zealand;(3) Research Institute for Technical Physics and Materials Science, Hungarian Academy of Sciences MFA, P.O. Box 49, 1525 Budapest, Hungary |
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| Abstract: | We have measured how irradiation by Ar+ and N+ ions modifies electronic conduction in single-wall carbon nanotube (SWNT) networks, finding dramatically different effects
for different thicknesses. For very thin transparent networks, ion irradiation increases localization of charge carriers and
reduces the variable-range hopping conductivity, especially at low temperatures. However, for thick networks (SWNT paper)
showing metallic conductivity, we find a relatively sharp peak in conductivity as a function of irradiation dose. Our investigation
of this peak reveals the important role of thermal annealing extending beyond the range of the irradiating ions, and shows
the dependence on the morphology of the samples. We propose a simple model that accounts for the temperature-dependent conductivity.
PACS 73.63.Fg; 61.80.-x |
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