22, 23] The surfaces of the FWs were quite smooth and flat compared with PANI-EB-doped FWs which were coated with PANI-EB as shown in Figure 1(b).
Figure 2 shows FT-IR spectra of FWs, PANI-EB powder, and PANI-EB-doped FWs, respectively.
Figure 3 shows the UV-Vis spectra of FWs, PANI-EB powder, and PANI-EB-doped FWs, respectively.
The interaction between PANI-EB and FWs in PANI-EB-doped FWs was confirmed by FT-IR and UV-Vis spectra and it is suggested that CT complex of [C.sup.60] and PANI-EB was formed as PANI-[EB.sup.[delta]+]- [C.sub.60.sup.[delta]-.
1) it is evident, that the current-voltage characteristics of the PANI-EB are nonlinear and temperature dependent.
In the electrical field with low intensity, the PANI-EB behaves as an insulator.
The mobility of charge carriers in PANI-EB is influenced by the electric field and the conductivity of polymer can be described by the equation
Therefore, it can be said that Schottky emission is the dominant conduction mechanism in PANI-EB, which is in agreement with the results obtained by other authors (Mathai, 2003; Pelto, 2004).
The current-voltage characteristics of PANI-EB at different temperatures were measured.