Characterization of highly conducting lithium salt doped polyaniline films prepared from polymer solution

摘要

We have developed a new method for preparing conducting polyaniline (Pani) films and investigated their chemical and physical properties by means of UV-Vis, FT-IR, EPR, XPS, and dc conductivity measurements. Conducting polyaniline films are prepared by casting from the solution of polyaniline with lithium salt. The free-standing films have relatively high dc conductivity without further treatment with HCl. The effects of lithium salts, such as LiBF_4, lIpf_6, and LiClO_4, and their concentrations on dc conductivty are studied. The dc conductivity of Pani-LiBF_4 film has been found to be better than those of Pani-LiPF_6, and Pani_LiClO_4 films. The dc conductivity of the systems increases with increasing lithium salt concentration in the range from 0.025 to 0.1 M, and exhibits a maximum value of approx 10~(-1) S/cm when 0.1 M LiBF_4 is doped.