Berlin 2018 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 33: Poster Session III

CPP 33.8: Poster

Dienstag, 13. März 2018, 14:00–16:00, Poster C

Morphology phase diagram of printed titania films derived from block copolymer assisted sol-gel templating — •Nian Li, Bo Su, Senlin Xia, and Peter Müller-Buschbaum — TU München, Physik-Department, LS Funktionelle Materialien, 85748 Garching

Printing, a simple and low-cost technique for producing films on an industrial scale, is employed to fabricate mesoporous titania thin films. Titanium(IV)isopropoxide (TTIP) is used as precursor and a diblock copolymer polystyrene-block-polyethylene oxide (PS-b-PEO) as the structure-directing template. The amphiphilic block copolymer PS-b-PEO undergoes phase separation and self-assembly due to a good-bad pair solvent, 1,4-dioxane and hydrochloric acid (HCl), respectively. By adjusting the weight fraction of 1,4-dioxane, HCl and TTIP, the titania films with different morphologies are obtained after evaporation and calcination processes. The surface morphology is probed via scanning electron microscopy (SEM) and atomic force microscopy (AFM), and the inner morphology is detected by grazing incidence small-angle X-ray scattering (GISAXS). A high degree of crystallinity of anatase titania is proved by X-ray diffraction (XRD) through optimizing the calcination temperature. The optical properties are examined with UV/Vis spectroscopy.