玻璃表面原位聚合沉积PANI薄膜机理的探讨

Growth Mechanism of PANI Films Prepared by in-situ Polymerization Deposition on Glass Surface

选用新型纳米SiO2为空间稳定剂，在玻璃表面原位聚合沉积得到高品质聚苯胺（PANI）薄膜。采用SEM、AFM、UV-Vis、FTIR和XRD测试技术对薄膜的表观形态、化学结构和组成进行了分析。结果表明，所得聚苯胺薄膜均匀、光滑、透明，表观质量优异，薄膜最大厚度约200nm，电导率为3．0×10^-3～1．8×10^-2 S／cm。PANI在玻璃表面上的成膜驱动力为玻璃浸润作用和苯胺阳离子自由基与玻璃表面的吸附力，薄膜的生长经历了吸附成核、生长和生长饱和3个明显的过程。

PANI films were in-situ prepared on the surface of glass substrates dipped into the solution of dispersion polymerization of aniline, using inorganic nano-particulate-nanometer SiO2 as steric stabilizer instead of water soluble polymer. The film morphology, chemical structure and composition of PANI film were characterized by SEM, AFM, UV-Vis, FTIR and XRD. The results indicate that homogeneous, satin and transparent PANI films could be prepared. The most thickness of the films could reach to 200 nm, and their conductivity ranged between 3.0×10^-3 - 1.8×10^-2 S/cm. Preliminary result indicates that there were two direct actuating forces aroused by aniline＇s adsorption on glass surface： one was the the soakage of glass surface;the other is the adsorption of aniline cation free radicals on glass surface. The growth of PANI films underwent three stages： adsorption nucleation, growth and growth saturation.