Electrical resistivity of polypyrrole nanotube measured by conductive scanning probe microscope: The role of contact force

Park, J. G.; Lee, S. H.; Kim, B.; Park, Y. W.
December 2002
Applied Physics Letters;12/9/2002, Vol. 81 Issue 24, p4625
Academic Journal
Polypyrrole (PPy) nanotubes were synthesized using the pores of track-etched polycarbonate membrane as a template. Its size depends on the pore diameter of template, range from 50 to 200 nm. Direct I-V measurements of PPy nanotube (diameter of 120 nm) deposited on Au were done using a metal-coated tapping-mode atomic-force-microscope tip. Linear I-V characteristics are observed, and the resistance is decreased as the contact force is increased. Using the Hertz model, the elastic modulus E and electrical resistivity p are estimated to be E∼1 GPa and ρ∼1 Ωcm. These values are consistent with those obtained in bulk PPy film.


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