Dresden 2020 – scientific programme
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O: Fachverband Oberflächenphysik
O 16: Nanoscale Heterogeneous Catalysis
O 16.7: Talk
Monday, March 16, 2020, 16:45–17:00, TRE Ma
Shape-controlling effects of hydrohalic and carboxylic acids in TiO2 nanoparticle synthesis — Kai Sellschopp1, Wolfgang Heckel1, Johannes Gäding1, Clemens Schröter2, Andreas Hensel2, Tobias Vossmeyer2, Horst Weller2, Stefan Müller1, and •Gregor Vonbun-Feldbauer1 — 1Institute of Advanced Ceramics, Hamburg University of Technology — 2Institute of Physical Chemistry, University of Hamburg
Shape-controlled synthesis of nanoparticles (NP), here titania (TiO2), is paramount for various fields from catalysis to materials design. In thermodynamic equilibrium, the NP shape is governed by the stability of competing surface facets which also determine characteristics of NPs such as the reactivity or the mechanical properties of assembled NPs. Combing density functional theory (DFT) calculations with experimental techniques such as TEM, we studied the influence of various adsorbates on the NP shape during synthesis. This effort allowed the identification of mechanisms stabilizing different facets and the detailed characterization of the NPs which shows the agreement between computational and experimental work. Investigating the effects of variations in the physical conditions and chemical environments, e.g. via changes in the chemical potentials, highlights potentials for new synthesis routes and NP shapes.