Regensburg 2016 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 12: Poster: Colloids and Complex Fluids

CPP 12.10: Poster

Montag, 7. März 2016, 18:15–21:00, Poster B2

Adsorption of silver complexes on gold nanorods - a combined SAXS/SANS study — •Tilo Schmutzler, Torben Schindler, and Tobias Unruh — Friedrich-Alexander-University Erlangen-Nuernberg, Chair for Crystallography and Structural Physics, Staudtstrasse 3, 91058 Erlangen, Germany.

Au nanoparticles have been the subject of widespread research in the last two decades. Therefore, numerous studies dealing with the synthesis leading to exact shape and size control were made. Applications are expected in biological imaging, drug delivery and phototherapeutics.[1]

The synthesis of Au nanorods (AuNRs) includes the addition of AgNO3 as catalytic component. The exact role of the silver species during the rod formation is rather unclear.

Using small angle neutron scattering (SANS) we were able to proof the adsorption of silver complexes on the gold nanorod surface. Thereby the AuNRs were stabilized by the micelle forming surfactant CTAB (Cetyltrimethylammonium bromide). SANS is very sensitive to the existence of these micelles due to the large scattering contrast in D2O whereas small angle X-ray scattering (SAXS) can be used to characterize the AuNRs itself. By the addition of AgNO3 and thiourea into a AuNR solution (1mM CTAB) the release of CTAB micelles was proofed by the increased neutron scattering related to the micelles. So far, we assume that the silver thiourea complexes replace the CTAB molecules at the AuNR facets resulting in the formation of micelles.

[1] C.J. Murphy et. al, J. Phys. Chem B. 2005, 109, 13857-13870.