Electronic and Photoelectron Spectral Studies of Electroactive Species Attached to Silanized C and Pt Electrodes

摘要

Depending on silanization reaction conditions, aminophenylferrocene and tetrakis (p-aminophenyl) porphyrin can be covalently attached in monolayer or multi-molecular layer quantities to glassy carbon and superficially oxidized Pt electrodes using 4-(methyldichlorosily)butyryl chloride. This study applies various spectroscopies to surface structure of the attached porphyrin: XPS (number of surface amide bonds), fluorescence (quantity of porphyrin attached to a siloxane polymer film compared to quantity of electroactive porphyrin), and reflectance spectroscopies (spectroelectrochemical observation of oxidation state changes with electrode under potential control, including an electrochemically silent Co(III/II) porphyrin reaction). Electroactive films 500 monolayers thick can be prepared from the ferrocene by spin coating reactive silane; in aqueous sulfuric acid voltammetry of these films indicates a phase-like property. (Author)