Preparation Of Conducting And Nanosized Polyaniline Films Of High Quality By In-Situ Polymerization

Recently conducting polyaniline (PANI) films have wide application prospect in optoelectronic and microelectronic devices, because of its insoluble performance, it's difficult to manufacture PANI using common methods. In this paper, Nano-sized and conducting polyaniline (PANI) films of high quality were prepared directly during dispersion polymerization of aniline on glass surfaces using poly (N-vinylpyrrolidone) (PVP) and poly (vinyl alcohol) (PVA) as stabilizers. This method solved the problem of poor processablity of PANI. Film surface was smooth, the thickness and conductivity of PANI films could be controlled. Film thickness ranged from several nanometers to hundreds of nanometers. Surface roughness was remarkably reduced in the presence of PVP or PVA. The influence of aniline and stabilizer concentration, deposition time and substrate properties on film structure and properties was studied.It was demonstrated that when aniline concentration was 0.2mol/L, 0.125wt% ⁴wt% of PVP and 2.5wt%—3wt% of PVA concentrations were apt to prepare high quality PANI films. Film conductivities increased with increasing film thickness and didn't alter any longer when film thickness got to saturated thickness. The conductivities of films could reache up to 4.4 S·cm^-1 and 9.5 S·cm^-1 respectively at room temperature.