Dresden 2020 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 21: Crystallization, Nucleation and Self-Assembly

CPP 21.7: Vortrag

Montag, 16. März 2020, 16:30–16:45, ZEU 255

Simultaneous SAXS-SANS to study direct influence of surfactant on anisotropic gold nanorod growth — •Tobias Zech1, Ezzeldin Metwalli1, Klaus Götz1, Lionel Porcar2, Anne Martel2, and Tobias Unruh11Friedrich-Alexander-University Erlangen-Nuremberg, Institute for Crystallography and Structural Physics, Erlangen, Germany — 2Institut Laue-Langevin, Grenoble, France

Despite many years of research on understanding the anisotropic growth of gold nanorods (AuNR), some questions remain. One is the influence of the ligand CTAB on shape, size and purity of synthesized gold nanorod solutions. However, in-situ studies, typically done with UV-Vis spectroscopy or SAXS, are only sensitive to the scattering volume of the inorganic gold nanoparticle. The influence of the organic parts, which make up most of the non-aqueous constituents in the solution are often treated as constant during the synthesis. We performed in-situ experiments to observe both inorganic and organic parts during AuNR synthesis via the unique SAXS/SANS instrument developed at our institute. This device is readily positioned at the D22 beamline at ILL. We not only observed, that the micelle structure is changing over time during the synthesis of AuNR but could also link those changes to the stages of growth of the nanoparticles. Furthermore, the influence of modified micelle structures via addition of n-alcohols can be directly correlated to differences in shape and size of the synthesized AuNR. This study shows a new perspective on how ligands can control anisotropic growth of noble metals on a nanoscale.

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