There is a great interest in creating porous materials with 3-dim periodicity as they can be used in very different areas. First of all the increase in active surface area of a porous compared to a flat electrode is desirable for analytical measurements [1,2] as well as for the integration of different materials that can exhibit beneficial catalytic effects [3]. Secondly multiple scattering of light in periodic porous structures can, if certain conditions are met, lead to a photonic band gap in the material, so that the light similar to electrons in a semiconductor cannot propagate anymore in the medium [4,5].

The fabrication of a colloidal crystal template is obtained by the transfer of a Langmuir film consisting of sub-μm Silica particles to a flat Gold electrode [6]. The latter has been hydrophilised by a SAM of an Aminothiol allowing the colloids to be transferred onto the electrode`s surface. By repeating the transfer it is possible to produce a template with a desired number of layers. The bottom up growth into the template is achieved electrochemically either by oxidation of Pyrrole or by reduction of gold ions. Dissolution of the Silica template with hydrofluoric acid generates the inverse structure.

Our goal is to control the electrochemical deposition of PPy and Gold into the template structure, so that a sandwich structure of alternating porous Gold/PPy can be produced that should exhibit special optical properties, as shown in [7].

[1] R. Szamocki, A. Velichko, C. Holzapfel, F. Mücklich, S. Ravaine, P. Garrigue, N. Sojic, R. Hempelmann, A. Kuhn Anal. Chem. 79 (2007) 533-539

[2] R. Szamocki, A. Velichko, F. Mücklich, S. Reculusa, S. Ravaine, S. Neugebauer, W. Schuhmann, R. Hempelmann, A. Kuhn Elec. Comm. 9 (2007) 2121–2127

[3] S. I. Matsushita, T. Miwa, D. A. Tryk, A. Fujishima Langmuir 14 (1998) 6441-6447

[4] K. Liu, T.A. Schmedake, R. Tsu Pysics Letters A Vol.373 21 (2009) 1885-1890

[5] A. Stein, F. Li, N. R. Denny Chem. Mater. 20 (2008) 649-666

[6] R. Szamocki, S. Reculusa, S. Ravaine, P. N. Bartlett, A. Kuhn, R. Hempelmann Angew. Chem. Int. Ed. 45 (2006) 1317 –1321

[7] J. Valentine, S. Zhang, T.Zentgraf, E.Ulin-Avila, D. A. Genov, G. Bartal, X.Zhang Nature 455 (2008) 376-

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