Functionalization of ZnO Nanorods via Ligand Exchange
In order to preserve the unique properties of nanoparticles (NPs), it is crucial to overcome their strong tendency to form agglomerates in solution. Finding adequate stabilizers, which introduce steric and/or electrostatic repulsion forces to the particle surface, enables the formation of colloidal stable suspensions. We use charged organic molecules, equipped with catechol anchor groups for attaching them covalently to the NPs to stabilize them due to electrostatic repulsion. We focus on TODA (3,6,9-Trioxadecanoic acid)-stabilized ZnO nanorods which are further functionalized with charged catechol. Single stabilized, positively charged ZnO nanorods are obtained by mono-functionalization. However, to directly investigate the functionalization in situ, the combination of different small angle techniques is necessary. By the combination of SAXS and SANS we were able to identify the acetate layer around ZnO NPs and want to determine now the stabilizing TODA shell before ligand exchange and the catechol shell after ligand exchange. By matching the contrast of the solvent to the catechol shell, the influence of residual TODA will be studied. Thus, we apply for 3 days of beamtime at D11.
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SCHINDLER Torben; LINDNER Peter; NOLL Dennis; SCHMIELE Martin; SCHMUTZLER Tilo and UNRUH Tobias. (2015). Functionalization of ZnO Nanorods via Ligand Exchange. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-12-424
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