Berlin 2015 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 3: Nanoparticles and Composite Materials I (joint session CPP, BP)

CPP 3.2: Talk

Monday, March 16, 2015, 09:45–10:00, C 243

ZnO nanoparticle stabilization - How much is necessary? — •Torben Schindler¹, Tilo Schmutzler¹, Wei Lin², Doris Segets², Wolfgang Peukert², and Tobias Unruh¹ — ¹Lehrstuhl für Kristallographie und Strukturphysik, Friedrich-Alexander-Universität Erlangen Nürnberg, Staudtstr. 3, 91058 Erlangen — ²Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik, Friedrich-Alexander-Universität Erlangen Nürnberg, Cauerstr. 4, 91058 Erlangen

The stabilization of small nanoparticles is of highest importance for their use in different applications. For these applications the stabilizer used in the synthesis is often exchanged by different species which offer the possibility of e.g. light harvesting for solar cells. However, the amount of stabilizer needed in the first place was seldomly addressed in the literature. In the case of solution processed ZnO nanoparticles acetate is often used as primary stabilizer. However, by washing of the samples it was observed that the nanoparticles become unstable and show strong agglomeration after three washing cycles. We investigated the changes in the stabilizing acetate layer by the combination of small angle X-ray and neutron scattering (SAXS&SANS). Initially the shell incorporates about 10% of the total acetate. This factor is clearly reduced in the washed samples which show still stability against agglomeration. Thus only a small amount of acetate is actually needed to stabilize the nanoparticles. In addition to these results the effect of first ligand exchange reactions using different amounts of catechol will be presented.