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SEM images of SWNT films with a filtrated volumes of (a) , (b) , and (c) . The SWNT concentration in the suspension was kept constant at for all the samples. The electron microscopy studies were performed on a LEO Zeiss Gemini 982 field emission scanning electron microscope (SEM) operated at .
(Color online) Ellipsometric angles: (a) , (b) , (c) Starting analytic model assuming a fraction of SWNTs as a semi-infinite medium not interacting with the host medium. (d) Numeric model assuming semitransparent bundles interacting at a dipole-dipole level (EMT).
(Color online) (a) Modeling parameters used to determine the dielectric response of the individual tube. (b-c) Calculated dielectric functions and of the single tube, as a function of the photon energy . Remarkable effects of confinement are the shifts of , and the appearance of the Drude background at , indicating the onset of metallic optical behavior.
(Color online) Direct current electrical conductivity vs SWNT fraction in transparent conducting SWNT thin films. Data from Ref. 6, ( and ) are added, since all the samples considered in the present study are electrically percolating.
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