Modular Functionalization of Electrodes by Cross-Coupling Reactions at Their Surfaces

Due to the increasing importance of modified electrodes for many applications in nanotechnology, including molecular electronics, bioelectronics, and sensors, there is a need to find ways to chemically attach suitable molecular films onto the electrodes. Combining the electroreduction of aryl diazon...

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Bibliographic Details
Published in:Advanced functional materials 2011-10, Vol.21 (19), p.3706-3714
Main Authors: Müri, Marcel, Gotsmann, Bernd, Leroux, Yann, Trouwborst, Marius, Lörtscher, Emanuel, Riel, Heike, Mayor, Marcel
Format: Article
Language:English
Subjects:
Bioelectricity
Biotechnology
chemical immobilization
Chemical Sciences
Conduction
Electrodes
Electrowinning
functionalized electrodes
Modular
Organic chemistry
organic electronics
surface modification
Voltammetry
X-rays
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Summary:Due to the increasing importance of modified electrodes for many applications in nanotechnology, including molecular electronics, bioelectronics, and sensors, there is a need to find ways to chemically attach suitable molecular films onto the electrodes. Combining the electroreduction of aryl diazonium salts with the Sonogashira cross‐coupling reaction, a new modular technique to modify electrodes is presented. The new technique allows a wide range of functional groups to be introduced onto electrode surfaces with high surface coverage by the functional subunit. Various organic subunits, including redox chromophores, are successfully attached to platinum electrodes. The corresponding films are characterized using cyclic voltammetry, X‐ray photoelectron spectroscopy, atomic force microscopy, and contact‐angle measurements. The electroreduction of diazonium salts is successfully achieved on a broad variety of conducting and semiconducting surfaces, which shows that the technique is applicable to a broad variety of substrates. A new modular technique to modify platinum electrodes is presented, which consists of the electroreduction of aryl diazonium salts combined with the Sonogashira cross‐coupling reaction in the solid state. This combination allows the introduction of a wide range of functional groups onto surfaces, with high surface coverage by the functional subunit.
ISSN:1616-301X
1616-3028
1616-3028
DOI:10.1002/adfm.201100642