INTERFACIAL ELECTROCHEMISTRY OF COLLOID-MODIFIED ELECTRODES

The interfacial electrochemical behavior of negatively charged, layere d structure, hydrophilic and hydrophobized swollen inorganic colloid a l clay films and cationic-dye- and cation ic-surfactant-incorporated c lay films, electrochemically prepared organic polyaniline films and in organic-organic composite materials (clay-polyaniline semiconductor wi res and nanowires; clay-CdS,PbS semiconductor colloidal particles and nanoparticles) has been investigated. Surface electrochemistry was mon itored via cyclic voltammetry. We have examined the charge-transport r eactions of the Fe(CN)(6)(3-) and Ru(NH3)(6)(3+) probe ions and p-benz oquinone and nitrobenzene probes. The effect of the hydrophobization, incorporation and composite formation on the rate of the charge-transp ort processes are discussed on the basis of the effect of different pr ocesses on the structure of the colloidal thin clay-film layer. (C) 19 98 Elsevier Science B.V. All rights reserved.