Berlin 2012 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 35: Poster Session II (Polymeric biomolecular films; Nanostructures; Electronic structure; Spin-orbit interaction; Phase transitions; Surface chemical reactions; Heterogeneous catalysis; Particles and clusters; Surface magnetism; Electron and spin dynamics; Surface dynamics; Methods; Electronic structure theory; Functional molecules)

O 35.9: Poster

Dienstag, 27. März 2012, 18:15–21:45, Poster B

Self-organized controlled positioning of nanoparticles based on the meniscus-force method — •Kathrin Kroth, Sabrina Darmawi, Torsten Henning, and Peter J. Klar — I. Physikalisches Institut, Justus-Liebig-Universität, Heinrich-Buff-Ring 16, DE-35392 Gießen, Germany

With the help of a periodic array of cavities, nanoparticles in solution can be separated and arranged. Arrays of cavities in the micrometer range were created in a thin layer of PMMA on a silicon substrate via EBL. A drop of solution containing nanoparticles, such as polystyrene-latex, Au and SiO₂ in the range of (300 ... 500) nm were deposited onto the array. During the evaporation of the drop the nanoparticles are shoved into the cavities by the meniscus-force. Since the meniscus-force is dependent on the contact angle, different surfactants were added to the solution. The approach of evaporating a thin film of metal on top of the structure was also used to manipulate the contact angle. A characterization of the particles inside the cavities was carried out via SEM and Raman mapping.