In situ investigations on the electrochemical polymerization and properties of polyaniline thin films by surface plasmon optical techniques
In situ investigations on the electrochemical polymerization and properties of polyaniline thin films by surface plasmon optical techniques
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DOI：
10.1021/jp011837z
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发表时间：
2002-02-21
影响因子：
3.3
通讯作者：
Knoll, W
中科院分区：
文献类型：
--
作者：
Baba, A;Advincula, RC;Knoll, W
采用原位表面等离子体共振光谱（SPS）和表面等离子体场增强光散射（SPLS）结合电化学方法研究了聚苯胺薄膜在金电极上的光学和电化学性质。首先，利用SPS和SPLS研究了苯胺的电聚合过程和聚苯胺膜的掺杂-脱掺杂过程。苯胺的电聚合是通过施加由循环伏安法已知的循环电位来实现的。电位循环导致不同的振荡灵敏地监测与这两种技术。获得的信息上的膜的介电常数和膜厚度的变化，对应于聚苯胺膜的形态转变。时间微分SPS动力学反射率曲线与循环伏安法相关。SPLS还应用于反向衰减全反射配置，以获得更多的相关性与聚苯胺膜的电化学行为和光学性质，因此，这种实验方法的组合允许同时阐明的光学和电化学性质的导电聚合物膜。
The combination of in situ surface plasmon resonance spectroscopy (SPS) and surface plasmon field-enhanced light scattering (SPLS) with an electrochemical method was used to simultaneously investigate the optical and electrochemical properties of polyaniline films on a planar gold electrode. First, the electropolymerization process of aniline and then the doping-dedoping process of the resulting polyaniline film were investigated using SPS and SPLS. The electropolymerization of aniline was achieved by applying a cycling potential known from cyclic voltammetry. Potential cycling resulted in distinct oscillations sensitively monitored with both techniques. Information was obtained on the change of the dielectric constant of the film and of the film thickness, corresponding to morphology transitions of the polyaniline film. The time-differential SPS kinetic reflectivity curve was correlated with cyclic voltammetry. SPLS was also applied in a reversed attenuated total reflection configuration to obtain more correlation with the electrochemical behavior and optical properties of the polyaniline film, Thus, this combination of experimental approaches allows for the simultaneous elucidation of optical and electrochemical properties of an ultrathin conducting polymer film.