关键词: 表面等离子体激元共振光谱, 聚苯胺, 现场电化学, 动力学分析

Abstract: The combination of electrochemistry with surface plasmon resonance (SPR) has been used to in situ investigate the kinetic growth process of polyaniline (PAn) at a gold surface. Sequential oscillations of SPR kinetic curve with a periodicity equal to that of cyclic potential were observed during the film growth. Such a drastic effect is attributed to a larger electronic density at PAn/Au electrode with respect to the bare gold electrode. Evidence from the SPR kinetic curve confirmed that there were three distinct kinetic stages for PAn film growth. In initial fast increase stage, the growth rate of the film was dependant linearly on aniline concentration and the square root of film thickness. A slower kinetic growth was observed in the second stage due to the three dimensional growth and the film degradation. In the third stage, The degradation of PAn film dominates. Different polymerization modes have different growth rate, and thus lead to different structures and properties of the film.

Key words: surface plasmon resonance, polyaniline, in situ electrochemistry, kinetic analysis