Use of Selective Redox Cross-Inhibitors for the Control of Organic Layer Formation Obtained via Diazonium Salt Reduction
| Autor: | Tony Breton, Isidoro López, Sylvie Dabos-Seignon |
|---|---|
| Přispěvatelé: | MOLTECH-Anjou, Université d'Angers (UA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2019 |
| Předmět: |
chemistry.chemical_element
Salt (chemistry) 02 engineering and technology 010402 general chemistry Photochemistry Electrochemistry 01 natural sciences Redox Diffusion layer chemistry.chemical_compound Electron transfer X-ray photoelectron spectroscopy [CHIM]Chemical Sciences General Materials Science Spectroscopy chemistry.chemical_classification Chemistry Chloranil [CHIM.MATE]Chemical Sciences/Material chemistry Surfaces and Interfaces 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences 0210 nano-technology Carbon |
| Zdroj: | Langmuir Langmuir, American Chemical Society, 2019, 35 (34), pp.11048-11055. ⟨10.1021/acs.langmuir.9b01397⟩ |
| ISSN: | 1520-5827 0743-7463 |
| Popis: | International audience; The controlled electrochemical deposition of a series of four diazonium salts (4-bromobenzene, 4-iodobenzene, 4-methoxybenzene, and 4-diethylaminobenzene diazonium) on carbon surfaces has been achieved by exploiting the use of three redox mediators: 2,2-diphenyl-1-picrylhydrazyl, chloranil, and dichlone. The efficiency of the method rests on a fast redox cross-reaction in the diffusion layer between the diazonium compound and the reduced form of the selected inhibitor, characterized by an outer-sphere electron transfer. The effect of the inhibitor addition in the deposition solution was characterized using electrochemical techniques, X-ray photoelectron spectroscopy, and atomic force microscopy. Near-monolayers are obtained when the potential of the redox mediator is at least 100 mV lower than the reduction potential of the diazonium salt concerned. A judicious choice of the redox entity can allow, via a fine control of the experimental conditions, to modulate the thickness of organic layers by varying the grafting potential. |
| Databáze: | OpenAIRE |
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