In Situ Investigation on Electrochemical Polymerization and Properties of Polyaniline Thin Films by Electrochemical Surface Plasmon Resonance / 分析化学

ABSTRACT

A new type of surface plasmon resonance ( SPR) spectroscopy system was designed and built. Here, a kind of dual photocell sensor was developed as a detection device to achieve a rapid measurement of SPR angle within a certain range. This SPR system was combined and integrated with electrochemical workstation to obtain a new type of electrochemistry-time-resolved SPR ( EC-TR-SPR ) instrument via instrumental technique. This EC-TR-SPR instrument was used to characterize the electrochemical polymerization process of aniline to validate the spectroscopic characteristics. Applications of transient electrochemical characterization methods, including chronoamperometry and differential pulse voltammetry, confirmed the time resolution and the applicability of this instrument system toward the steady state and transient electrochemical methods upon small molecular reactions. The experiment results showed that this EC-TR-SPR possessed the time resolution up to 10000 times per second (0. 1 ms), and could be used to real-time investigate the doping and de-doping of polymerization process of aniline monomer as well as the prepared polyaniline film, which could not be discriminated on a conventional electrochemical current-time curve. .