Regensburg 2016 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 15: STM/AFM: New Approaches
O 15.2: Vortrag
Montag, 7. März 2016, 15:15–15:30, H24
Sub-molecular imaging by NC-AFM with an oxygen atom rigidly connected to a metallic probe — Oscar Díaz Arado1, •Harry Mönig1, Diego Rodríguez Hermoso2, Milica Todorevic2, Alexander Timmer1, Simon Schüer1, Gernot Langewisch1, Rubén Pérez2, and Harald Fuchs1 — 1Physikalisches Institut, Westfälische Wilhelms-Universität, Münster, Germany — 2Departamento de Física Teórica de la Materia Condensada, Universidad Autónoma de Madrid, Spain
In scanning probe microscopy, the imaging characteristics in the various interaction channels crucially depend on the chemical termination of the probe tip. Here we analyze the contrast signatures of an O-terminated Cu tip with a tetrahedral configuration of the covalently bound terminal O atom. Supported by first-principles calculations, NC-AFM, and STM experiments, we show how this tip can be identified on a partially oxidized Cu(110) surface. After controlled tip functionalization, constant height NC-AFM imaging in the repulsive force regime reveals the internal bond structure of an organic molecule. In established tip functionalization approaches, the probe particles (e.g. CO or Xe) are only weakly bound to the metallic tip leading to lateral deflections during scanning. In contrast, our simulations for our tip show that lateral deflections of the terminating O atom are negligible. Its structural rigidity, chemically passivated state and a high electron density at the apex make the O-terminated Cu tip a highly attractive complementary probe for the characterization of organic nanostructures on surfaces.