Berlin 2015 – scientific programme

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BP: Fachverband Biologische Physik

BP 11: Nanoparticles and Composite Materials II (joint CPP/BP)

BP 11.9: Talk

Monday, March 16, 2015, 17:15–17:30, C 243

Formation of anisotropic gold nanoparticles with different morphologies analysed by UV-Vis spectroscopy, SAXS and TEM — •Tilo Schmutzler, Torben Schindler, Martin Schmiele, and Tobias Unruh — Friedrich-Alexander-University Erlangen-Nuernberg, Chair for Crystallography and Structural Physics, Staudtstrasse 3, 91058 Erlangen, Germany

Au nanoparticles (NPs) 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]

Especially anisotropic Au NPs show interesting optical behaviour due to their ability to absorb light at different wavelengths for more than one surface plasmon resonance. Via a modified seed-mediated growth synthesis route for gold nanorods[1] we were able to synthesize various morphologies of Au NPs with defined absorption bands (500-800 nm) in the UV-Vis spectrum and narrow distributions of the particle dimensions which could be determined by small angle X-ray scattering (SAXS) and transmission electron microscopy (TEM).

The particle formation of Au nanorods in contrast to other morphologies like star-like nanoaggregates under different conditions (temperature, concentration of precursors, ...) was investigated by UV-Vis spectroscopy, SAXS and TEM to understand indirectly the formation mechanism of such particles.

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