Modified Electrodes Prepared from Ferrocene Functionalized Silicate Xerogels: Analysis of the Electrochemical Response in Isotropic and Fractal Structural Systems
| Autor: | Fabien Miomandre, Sallard S, Pierre Audebert |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Nanostructure
Materials science Silanes Metallocenes Silicates Biomedical Engineering Bioengineering General Chemistry Condensed Matter Physics Electrochemistry Redox Catalysis chemistry.chemical_compound Fractals Chemical engineering chemistry Ferrocene Polymer chemistry General Materials Science Ferrous Compounds Hybrid material Electrodes Gels Sol-gel |
| Zdroj: | Journal of Nanoscience and Nanotechnology. 6:396-400 |
| ISSN: | 1533-4899 1533-4880 |
| DOI: | 10.1166/jnn.2006.915 |
| Popis: | New xerogels functionalized by ferrocenes as redox probes have been prepared using various types of catalysis. The analysis of the electrochemical response in the case of modified electrodes allows us to get an insight into the gel nanostructure which has been found to be isotropic in the case of acidic catalysis, and fractal in the case of fluoride catalysis, provided that the amount of functionalized silanes is not too high. Indeed the results of electrochemical measurement prove that the fractality of functionalized hybrid silica is general in the case of basic catalysis, except in the case of very high functional moieties loading, where the electrode become essentially organic and isotropic. On the other hand, in the case of acidic catalysis, whatever the amount of organic material, the hybrid gel remains isotropic, and a classical electron pseudo-diffusive behaviour is observed. The diffusion coefficient values extracted from the current-time slopes do not vary monotonically with the amount of redox probe in the case of fractal xerogel structures, which is indicative that not all the functional moieties are electroactive in that case. |
| Databáze: | OpenAIRE |
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