Berlin 2015 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

CPP: Fachverband Chemische Physik und Polymerphysik

CPP 43: P8: Nanoparticles and Compsite Materials

CPP 43.22: Poster

Wednesday, March 18, 2015, 10:00–13:00, Poster A

Influence of additives on the structure of CTAB and its role in gold nanoparticle formation — •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]

The common wet chemical synthesis of anisotropic Au NPs 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 Au NP formation can be influenced by additives like alcohols or inorganic salts. Increasing concentrations of KBr for example lead to a higher repulsion of the micelles which was investigated by small angle X-ray and neutron scattering (SAXS, SANS) whereas UV-Vis spectroscopy revealed a slower formation kinetic of the Au NPs in KBr containing CTAB solutions. The characterization of the final Au NPs via SAXS and transmission electron microscopy (TEM) show systematic variations of the particle dimensions.

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