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Transition metal substituted Krebs-type Polyoxometalate doped PEDOT films.

The Krebs transition metal substituted type polyoxometalate [Sb2W20M2O70(H2O)6]n-, M = Fe(III), Co(II) or Cu(II) were surface immobilized within the conducting polymer 3,4-ethylene dioxythiophene (PEDOT) on glassy carbon electrode surfaces. The immobilized films of different thickness were characterised by electrochemical and surface based techniques. The inherent redox activity for the [Sb2W20M2O70(H2O)6]n-, M = Fe(III), Co(II) or Cu(II) POMs observed in the solution phase were maintained in the polymeric PEDOT matrix. The resulting films were found to be extremely stable towards redox switching between the various POM based redox states. The films exhibited pH dependent redox activity and thin layer behavior up to 100mVs-1. The films were found to be highly conductive through the employment of AC impedance spectroscopy. Surface characterization of the films was carried out by using X-ray photoelectron spectroscopy, atomic force microscopy and scanning electron microscopy.graph.