Oxides are known as the basis of smart devices. Among the group of oxide, we were interested in Zinc Oxide (ZnO) synthesis for its potential applications in many fields [1]. In our laboratory, a variety of nanostructures were fabricated including nanorods and nanowires of ZnO by electrodeposition from a ZnCl₂ solution with O₂ bubbling [2].

Self assembled monolayers on nanorods and nanowires of ZnO were prepared from the attachment of a ferrocene derivative: N-(3-trimethoxysilyl)-propylferrocenecarboxamide. The different steps of this synthesis were characterised by RMN, FTIR and ESI.

The reversible one-electron wave of the ferrocene/férricinium was observed at a potential close to the one in solution. The system was found very stable in both organic and aqueous media. Electrowetting study (contact angle variation within the potential applied on a sessile drop) was carried out on these monolayers. We observed a decreasing in contact angle while increasing the potential. This was attributed to the ferrocene oxidation at the interface.

These redox devices have many applications in photovoltaic and chemical detection of organic and inorganic ions.

References

[1] a) M. H. Huang, Y. Wu, H. Feick, N. Tran, E. Weber, P. Yang, Adv. Mater. 2001, 13, 113. b) Z. R. Dai, Z. Pan, Z. L. Wang, Adv. Funct. Mater. 2003, 13, 9.

[2] a) C. Badre, T. Pauporté, M. Turmine, D. Lincot, Superlattices and Microstructures, in press. b) A. Goux, T. Pauporté, J. Chivot, D. Lincot, Electrochim. Acta 2005, 50, 2239.

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