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Author(s): Verena Stockhausen
Jean Christophe Lacroix
Gaelle Trippé-Allard
Nguyen Van Quynh
Jalal Ghilane
Title: Graftingπ-Conjugated Oligomers Incorporating 3,4-Ethylenedioxythiophene (EDOT) and Thiophene Units on Surfaces by Diazonium Electroreduction
Issue Date: 2015-07-23
Abstract: : The electrochemical reduction of diazonium salts, generatedin situ, from 2-(4-aminophenyl)-3,4-ethylenedioxythiophene and two newamino functionalized π-conjugated oligomers incorporating 3,4-ethylenedioxythiophene (EDOT) and thiophene units, has been investigated. It coats theelectrodes (glassy carbon (GC), gold or ITO) with an ultrathin organic layer(less than 10 nm thickness). The X-ray photoelectron spectroscopy (XPS)investigations confirm the presence of the starting oligomers deposited onthe surface. As an important result, EDOT-based oligomer grafting wasachieved on those surfaces which may be of general use as adhesion primerlayers in all devices using PEDOT type materials. Furthermore, the coating iselectroactive and the electrochemical investigations exhibit redox signal atpotentials close to that obtained for short oligoEDOT in solution. Theelectrochemical responses of the modified GC electrodes were furtherstudied in the presence of various reversible redox probes, showing that theattached layer acts as a conductive switch. The switching potential of the generated layer depends on the configuration of thestarting oligomers and more precisely on the relative location of the EDOT unit. Such layer behave as a barrier to electrontransfer when the standard redox potential of the redox probe is below the layer switching potential; in this case, a positivepotential shift of the probe oxidation peak and a diode-like behavior are observed. However, for redox probes with redoxpotentials above the switching potential of the grafted film, the layer is transparent toward electron transfer, and no barrier effectis observed.
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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