Regensburg 2013 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 12: Poster: Nanoparticles and Composite Materials
CPP 12.22: Poster
Montag, 11. März 2013, 17:30–19:30, Poster C
Correlation of optical characteristics of gold nanoparticle-DNA networks with size and internal structure — •Malte Linn1, Anne Buchkremer2, Jan Timper3, Thomas Eckert4, Walter Richtering4, Joachim Mayer3, Gero von Plessen1, and Ulrich Simon2 — 1Inst. of Physics (IA), RWTH Aachen University — 2Inst. of Inorganic Chemistry, RWTH Aachen University — 3Central Facility for Electron Microscopy, RWTH Aachen University — 4Inst. of Physical Chemistry, RWTH Aachen University
The application of nanoplasmonic materials relies on the fabrication of metallic nanostructures with well defined sizes and geometries. By mixing different ratios of DNA-functionalized gold nanoparticles (AuNPs), various kinds of DNA-AuNP networks can be tailored. The size and internal structure of these networks determines their optical properties, due to interparticle coupling. The networks are thermally and photothermally addressable and therefore interesting for possible applications in the fields of drug release or gene regulation. In this work, we analyze the size and internal structure of DNA-AuNP networks by combining optical extinction spectroscopy, dynamic light scattering, small angle X-ray scattering, in situ-TEM measurements and generalized Mie calculations. Using these techniques, we determine the different interparticle distances in the networks. For small networks, they are consistent with a center-shell geometry.