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Chemical structures of polymers used as matrices.
(Color online) Cross section of the composite film showing location of SWNT near the film-air interface (a) or near the film-substrate interface (b) due to vertical phase separation. Scheme of the electrical conductivity measurements “on top” (c) and “on the bottom” (d) of the composite film. Curved lines inside of the composite film intend to show a presumable region of the electrical current flow in each case.
(Color online) Linear (a) and semilogarithmic [(b) and (c)] plots of curves for polymer nanocomposites measured at film-air interface (top) or at film-substrate interface (bottom) of the film. In plot (c) pure PS (triangles) and PU (open circles) matrix film conductivity curves are shown for comparison. Absolute values of the current are shown for both direct and reversed biases in (b) and (c).
AFM image of an individual nanotube bundle with unbundled edge showing two constituting SWNTs of diameter (a), and FMM-AFM image of the PU/SWNT composite with carbon nanotubes traversing on the surface (b).
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