Sheet resistance, fiber diameter, average crystallite size and dimethanolferrocene oxidation peak currents of 20 min deposited nanofiber layers after different thermal treatments. Sample 500Air did not undergo additional thermal treatment. Other samples, 500N2, 1000Air and 1000N2 were thermally treated accordingly in 500 °C under nitrogen, in 1000 °C in air and in 1000 °C under nitrogen. Peak currents for samples 500Air and 500N2 were only roughly estimated since the peaks were not well defined.