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The strikingly different charge transport behaviors in nanocomposites ofmultiwall carbon nanotubes (MWNTs) and conducting polymer polyethylenedioxythiophene - polystyrene sulfonic acid (PEDOT-PSS) at low temperatures areexplained by probing their conformational properties using small angle X-rayscattering (SAXS). The SAXS studies indicate assembly of elongated PEDOT-PSSglobules on the walls of nanotubes, coating them partially thereby limiting theinteraction between the nanotubes in the polymer matrix. This results in acharge transport governed mainly by small polarons in the conducting polymerdespite the presence of metallic MWNTs. At T > 4 K, hopping of the chargecarriers following 1D-VRH is evident which also gives rise to a positivemagnetoresistance (MR) with an enhanced localization length (~ 5 nm) due to thepresence of MWNTs. However, at T < 4 K, the observation of an unconventionalpositive temperature coefficient of resistivity (TCR) is attributed to smallpolaron tunnelling. The exceptionally large negative MR observed in thistemperature regime is conjectured to be due to the presence of quasi-1D MWNTsthat can aid in lowering the tunnelling barrier across the nanotube - polymerboundary resulting in large delocalization.

Correlated conformation and charge transport in multiwall carbon nanotube - conducting polymer nanocomposites