Through Macroporous zinc oxide (MPZnO) synthesis in both two and three-dimensional colloidal crystal templates should be possible to get photonic behaviour or enhance sensing characteristics as well as classical properties of ZnO bulk.¹ Successful results have been obtained by atomic layer deposition, sol-gel, spray pyrolysis, infiltration and electrodeposition (ED).^1-4 However by ED only nitrate ions have seen employed as oxygen precursor. Our goal was to consider new electrochemical routes and optimize the MPZnO ED by employing hydrogen peroxide (H₂O₂), an oxygen precursor never employed for this case and concentrated zinc ions electrolyte.

In current work we use polystyrene spheres templates (350 and 900 nm in diameter) prepared by Ghanem’s method on Indium tin oxide (ITO).⁵ We could compare our results with those obtained by Sumida et al who have found the overpotential effect in the quality of macroporous films with nitrate ions.² In our case, we found concentrations effects being better those films obtained at H₂O₂ concentrations above 20 mM on ITO. Below that, the structure was disordered and doesn’t follow the geometry of the template. These observations are supported by analysis of X-Ray Diffraction data, where the mean size of crystallites is close to 15 nm, even smaller than results obtained by Pauporte-Lincot.⁶ These results will be discussed in term of competition between grain growth habits and complete pore filling.

References

1. S.M. Abrarova, S.U. Yuldasheva, S.B. Leeb and T.W. Kang; J. Lumin. 109 (2004) 25.
2. T. Sumida, Y. Wada, T. Kitamura and S. Yanagida; Chem. Lett. (2001) 38.
3. M. Scharrer, X. Wu, A. Yamilov, H. Cao, and R. P. H. Changa; Appl. Phys. Lett. 86 (2005) 151113.
4. Y. Yang, B. Yang, Z. Fu, H. Yan, W. Zhen, W. Dong, L. Xia, W. Liu, Z. Jian and F. Li; J. Phys.: Condens. Matter. 16 (2004) 7277.
5. M. A. Ghanem, P. N. Bartlett, P. de Groot, A. Zhukov; Electrochem. Comm. 6 (2004) 447.
6. T. Pauporté and D. Lincot; J. Electrochem. Soc., 148 (2001) C310.

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