In recent years, electrodeposition has emerged as a versatile process for the preparation of zinc oxide thin films. Mesoporous thin films of ZnO were prepared by an electrochemical method using eosin Y (EY) as a structure directing agent (SDA). In the hybrid ZnO based film, EY is incorporated after a two electron reduction process [1] and forms a continuous fibrous structure [2]. Interestingly, EY can be almost completely removed from the film and a transparent porous ZnO films is released [3]. The specific surface area and mesoporosity of films prepared at various EY concentration and deposition time have been characterized in detail by physical adsorption using krypton as the adsorptive [4]. The preparation conditions have been optimized to obtain films with both the largest possible surface area and good mechanical properties. The preparation of ZnO/polymer hybrid films will be also illustrated [5]. Due to the complexing properties of the polymer for Zn²⁺, this compound can be incorporated in a large amount in ZnO films and strengthening their mechanical properties for applications in flexible devices. It has been found that the polymer controls the crystallographic properties of ZnO. The strong film orientation can be varied between [002], [101] and [100] with increasing polymer concentration. Furthermore, higher polymer film content leads to a better crystallographic quality of the compound as shown by the increase in the intensity ratio between near band edge (NBE) UV emission and deep level green emission in room-temperature photoluminescence spectra.

References :

[1] A. Goux, T. pauporté, D. Lincot, L. Dunsh, ChemPhysChem, 2007, 8, 926-931.

[2] A. Goux, T. Pauporté, D. Lincot, Langmuir, 2006, 22, 10545.

[3] Yoshida T., Iwaya M., Ando H., Oekermann T, Nonomura K, Schlettwein D., Wöhrle D., Minoura H., Chem. Commun. 2004, 4, 400.

[4] Rathousky J., Pauporté T. J. Phys. Chem. C, DOI: 10.1021/jp071465f

[5] Pauporté T, Crystal Growth Design, submitted.

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