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Electrochemical synthesis of ZnO in the presence of Dye or polymer additives.
|Thierry Pauporte , Daniel Lincot|
Ecole Nationale Supérieure de chimie de Paris (ENSCP), 11 rue P. et M. Curie, Paris 75005, France
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  and forms a continuous fibrous structure . Interestingly, EY can be almost completely removed from the film and a transparent porous ZnO films is released . 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 . 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 . 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 ,  and  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.
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Presentation: Oral at E-MRS Fall Meeting 2007, Symposium B, by Thierry Pauporte
See On-line Journal of E-MRS Fall Meeting 2007
Submitted: 2007-05-14 10:57 Revised: 2009-06-07 00:44