Berlin 2012 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 13: Poster: Interfaces and Thin Films

CPP 13.5: Poster

Dienstag, 27. März 2012, 18:15–20:45, Poster A

Implementation of super-structures on mesoporous titania films via soft embossing — •Gregory D. Tainter, Martin A. Niedermeier, and Peter Müller-Buschbaum — TU München, Physik-Department, LS Funktionelle Materialien, James-Franck-Str.1, 85748 Garching, Germany

Metal oxide thin films are the subject of numerous studies due to their potential as photoactive layers, e.g. in photocatalysis and photovoltaics. Using diblock copolymer scaffolds to control the morphologies of mesoporous titania films has been shown to be effective in improving the specific area of such films. The benefits of super-structuring have been successfully demonstrated in the past. A light trapping effect can lead to enhanced absorption in the film which is a highly desirable property for optoelectronic devices.[1]

In this work, hybrid polymer/titania films are prepared via a sol-gel route. The diblock copolymer poly(styrene - block - ethylene oxide) is used to create a mesoporous titania structure through good-poor solvent induced phase separation. The results of soft embossing such hybrid films with varying pressures and temperatures are investigated using optical microscopy, atomic force microscopy and scanning electron microscopy. The optical properties are probed with UV/Vis spectroscopy.

[1] Niggemann et al., Physica status solidi. A 205 12, 2862 (2008)