Nanotransport in polyacetylene single fiber: Toward the intrinsic properties

The electrical transport properties of iodine doped polyacetylene (PA) nano fibers were measured as function of temperature in micron and sub-micron sc ale. Polyacetylene fiber network measured in micron scale shows weaker temp erature dependence of resistivity and smaller negative magnetoresistance (M R) at T=1.5K compared to those of bulk PA film. The reaction of Au electrod es with dopant became serious in submicron experiment, so that stripes of P t electrodes with 100nm separation were patterned on top of the SiO2 substr ate to prevent the reaction, Non-ohmic I-V charactersitics are observed in PA nanofiber, The gate dependence shows the charge carrier to be hole with mobility mu (FET) similar to 4.4x10(-5)cm(2)/Vs at 233K. The non-ohmic I-V dependence at high electric fields could be originated from the soliton tun neling conduction in PA nanofiber.