阳离子型聚二茂铁硅烷多层自组装膜的研究

用阳离子型的聚二茂铁硅烷(PFS Cl-)与阴离子型的聚苯乙烯磺酸钠(PSS-Na )在石英、金材料表面上制备了PFS -PSS-多层自组装膜.多层自组装膜的逐层UV-Vis光谱表明,多层膜具有均匀有序的结构.多层自组装膜的电化学研究表明,膜的电化学性质与膜的层数和膜外表面聚电解质性质有关.当自组装膜层数较少时,膜电极过程表现出表面定域的单层膜性质;当膜层数较多时,膜内电活性物质的扩散成为控制步骤.而且,随着膜层数增加,膜内传质阻力增大,膜内扩散速率减小,膜的CV峰的可逆性降低.

Multilayer Self-assembly Films of Cationic Polyferrocenylsilanes

Polycationic polyferrocenylsilanes(PFS Cl-)is employed together with poly(sodium styrenesulfonate)(PSS-Na )in the electrostatic layer-by-layer self-assembly process to form multilayer films on quartz piece and gold electrode.The UV-Vis spectra of the multilayer films are measured.The linear relation between absorbance and the number of bilayers is indicative for the formation of well-defined multilayer.The electrochemistry of PFS -PSS-multilayer films indicates that the electrochemical properties of multilayer film depend on the number of layers and the properties of the outermost layer.When self-assembled film layers are fewer,the film electrode process indicates features of surface-localized single layer film.When self-assembled film layers are more,the diffusion of electroactive species gradually becomes a controlling step.With the increase of the number of layers the resistance of mass transport in the film increases,and the rate of diffusion in the film and the reversibility of CV process decrease.