Dresden 2014 – wissenschaftliches Programm

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KR: Fachgruppe Kristallographie

KR 8: Poster Crystallography

KR 8.5: Poster

Mittwoch, 2. April 2014, 17:00–19:30, P4

Combining SAXS and TEM to reveal the mechanism of nucleation and growth of anisotropic noble metal nanoparticles — •Tilo Schmutzler, Torben Schindler, Martin Schmiele, Thaer Kassar, Christian Bär, and Tobias Unruh — Chair for Chrystallography and Structural Physics, Friedrich-Alexander University Erlangen-Nürnberg, Staudtstr. 3, 91058 Erlangen, Germany

Anisotropic noble metal nanoparticles like nanorods or nanowires of gold and silver have been the subject of widespread research in the last two decades because of their possible applications i.e. in biological imaging and drug delivery. One common synthesis is the seed-mediated growth method, where a noble metal precursor is reduced in aqueous solution to form isomorphic seed particles that lead to anisotropic nanorods by further reduction of the precursor in the presence of cetyltrimethylammonium bromide (CTAB). Neither the exact formation mechanism of the seed particles nor that of the anisotropic growth in the presence of CTAB is completely understood up to now.

In situ time-resolved small angle x-ray scattering (SAXS) is a powerful tool to study the size and shape of nanoparticles in dependence of temperature and time during their formation and growth. In addition, transmission electron microscopy (TEM) reveals the current shape, polydispersity and size distribution of the particles. In the poster we will present studies to reveal the mechanism of nucleation and growth of anisotropic noble metal nanoparticles under the load of CTAB combining the results of the complimentary techniques of in situ SAXS and ex situ TEM.