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MM: Fachverband Metall- und Materialphysik

MM 59: Topical session: In-situ Microscopy with Electrons, X-Rays and Scanning Probes in Materials Science VII - Nanomaterials

MM 59.5: Vortrag

Donnerstag, 10. März 2016, 17:45–18:00, H38

The role of CTAB micelles in gold nanorod synthesis - 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. Applications are expected in biological imaging, drug delivery and phototherapeutics.

The common wet chemical synthesis of gold nanorods (AuNRs) is the seed-mediated growth synthesis route.[1] Therefore small seed particles are used to grow nanorods in a solution of CTAB (Cetyltrimethylammonium bromide) as structure directing agent.

The behaviour of CTAB in solution and so the influence on the final AuNR formation can be influenced by additives like inorganic salts. Increasing concentrations of KBr for example lead to a slower formation kinetic of AuNRs which was investigated by time-resolved small angle X-ray scattering (SAXS) simultaneously to UV-Vis spectroscopy. Additionally the rod formation beside other morphologies is less pronounced compared to the synthesis in solutions without further KBr. The influence of CTAB as catalytically active component is obvious due to the change of the scattering related to the micelles itself. Therefore small angle neutron scattering (SANS) is perfectly suitable to analyze the structure of CTAB modified by different additives to understand the behavior during AuNR formation.

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