Abstract
The extremely stable conductivity against molecular physisorptions was revealed in thin films of high-purity metallic single wall carbon nanotubes (SWCNTs). The stability of the metallic SWCNTs results from their constant electronic density of state near the Fermi level. In the case of a mixture of metallic and semiconducting SWCNTs, the existence of semiconducting SWCNTs in the films makes the sheet resistance more sensitive to the adsorption of molecules mainly due to carrier doping. In the practical use for the transparent electrode, stability of the resistance is important and pure metallic SWCNTs have great advantages for such kind of applications.
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