Ohmic contacts between sulfonated polyaniline and metals

We have compared the resistivity, ρ, of sulfonated polyaniline (SPAN) prepared via three different synthetic routes: electrochemical synthesis with a supporting electrolyte (camphorsulfonic acid), ρ =340 Ω·m; electrochemical synthesis without a supporting electrolyte, ρ =530 Ω·m, and; chemical synthesis, ρ =166 Ω·m. Independent of the metal contact (Al, Au, Cu), SPAN forms ohmic contacts with the metal and the contact resistance r _c ~5 Ω does not correlate with the metal's work function. Electronic Publication