Regensburg 2007 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 1: Supramolecular Aggregates

CPP 1.9: Vortrag

Montag, 26. März 2007, 12:00–12:15, H37

Self-assembly of diblock-copolymer micelles for template-based preparation of PbTiO₃ nanograins — Stephan Kronholz¹, •Silke Rathgeber², Silvia Karthäuser¹, Hermann Kohlstedt¹, Sven Clemens³, and Theodor Schneller³ — ¹Max-Planck Institute for Polymer Science, Polymer Physics, 55128 Mainz — ²Research Center Jülich GmbH, Center of Nanoelectronic Systems for Information Technology, 52425 Jülich — ³RWTH-Aachen, Institute of Materials for Electronic Engineering 2, 52074 Aachen

A bottom-up fabrication route for ferroelectric PbTiO3 nanograins grown on predefined TiO₂ nanostructures used as seeds is presented. [1] The structuring of the TiO₂ seeds is performed using a self-organized template constructed from a gold-loaded micellar monofilm. With this fabrication process, 12nm TiO₂ seeds and 30nm PbTiO₃ grains are prepared without any e-beam lithographic step. The dimensions of the structure imposed by the micellar template are transferred through all the processing steps to the final PbTiO₃ grains. By a combination of scattering experiments on the micellar solutions and a characterization of the monofilm we can determine whether the architecture of the diblock-copolymers in the micelles or the preparation conditions determine the quality and characteristics of the monofilm. It is shown that the intermicelle distance and the degree of order in the dried monofilm is mainly determined by the pulling velocity in the dipping process and the strength of the surface-micelle interaction, and not necessarily by the architecture of the diblock copolymers. [1] S. Kronholz et al., Adv. Funct. Mater. 16, 2346 (2006)