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 35.111: Poster

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

Experiments on molecular heat transport — •Nils Könne, Ludwig Worbes, David Hellmann, Konstantin Kloppstech, Hanna Fedderwitz, and Achim Kittel — EHF, Fak. V, Physik, Carl von Ossietzky Universität Oldenburg

The aim of our research is the heat transfer through a single molecule a topic which has attracted a lot of interest in recent years [1]. We have developed a near field scanning thermal microscope (NSThM) to investigate heat transfer under ultra high vacuum conditions across distances ranging from fractions of a nanometer to a few nanometers. The microscope has a lateral resolution in the range of a few nanometers. In the present project we are using this instrument to investigate the molecular heat transfer. To address this we are using self assembled mono layers as a model system. For this purpose different thiols are arranged on a gold covered substrate to which the thiol group of the molecule is bound covalently. Firstly, we characterize the degree of coverage of the film by means of atomic force microscopy. The heat transfer is investigated under ultra high vacuum conditions by cooling (about 120K) or heating the sample (350K) and keeping the NSThM tip at room temperature. First result will be presented. [1] Yonatan Dubi and Massimiliano Di Ventra, Rev. Mod. Phys. 83, 131 (2011).