Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 35: Poster Session I (Scanning probe methods)
O 35.15: Poster
Dienstag, 15. März 2011, 18:30–22:00, P3
Near-field heat transfer of alkanethiol on flat gold surfaces — •Christian Olling1, Ludwig Worbes1, David Hellmann1, and Achim Kittel1,2 — 1Energy and Semiconductor Research Laboratory, Institute of Physics, University of Oldenburg, 26129 Oldenburg, Germany — 2Experimental Polymer Physics, Faculty of Mathematics and Physics, University of Freiburg, 79104 Freiburg, Germany
In this contribution we discuss the heat transport through a molecular layer on a heated or cooled surface. As molecules we have chosen alkanethiol because it is well known that alkanethiols form self-organized monolayers on flat gold surfaces. The measurements are performed with a near-field scanning thermal microscope (NSThM) which was developed by our group. A coaxial micro thermocouple serves as tip of a commercial variable temperature UHV-STM is able to measure the heat flux through the molecular layer without any interfering heat conduction by a surrounding gas. Hence, the microscope can be operated in NSThM and STM mode at the same time. Changes in the heat transfer are investigated by retracting the tip from the surface and the heat transfer of the bare gold surface. Furthermore, surface roughness and morphology influence the heat transfer on the nanometer scale. This is investigated by scanning over the surface and mapping the heat transfer.