Dresden 2011 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 27: Polymer Self Assembly

CPP 27.4: Talk

Wednesday, March 16, 2011, 12:45–13:00, ZEU 160

Superstructuring of bicontinuous foam-like titania nanostructures in thin films — •Martin A. Niedermeier, Florian Schaff, Volker Körstgens, and Peter Müller-Buschbaum — TU München, Physik Department, LS Funkt. Mat., James-Franck-Str. 1, 85748 Garching, Germany

Thin films of nanostructured titania have received a lot of attention in various applications, e.g. photovoltaics. The beneficial influence of superstructures has been successfully demonstrated in the past [1]. A light trapping effect can lead to enhanced absorption in the film which is a highly desirable property for optoelectronical devices. In our approach, thin titania films are prepared via a sol-gel route leading to a well defined bicontinuous foam-like nanostructure which exhibits a high surface to volume ratio. Using cost-efficient printing techniques the superstructure is applied to the polymer/titania composite film using a master. Finally, calcination in ambient air is used to transfer the titania into its anatase phase. The super- and nanostructure of the films are characterized using several imaging techniques like SEM or AFM as well as GISAXS. The crystallinity and the thickness of the films were analysed with XRD and XRR. UV/Vis measurements were conducted to investigate the superstructure's influence on the optical properties of the film. [1] M. Niggeman, et al., Thin Solid Films, 451-452 (2004) 619-623