Dresden 2017 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 51: Nanostructures at Surfaces: 1D and 2D Structures and Networks
O 51.16: Poster
Dienstag, 21. März 2017, 18:30–20:30, P1C
The influence of low energy electron irradiation on the work function of aromatic self-assembled monolayers investigated by Kelvin Probe Force Microscopy — •Paul Penner1, Marcin Kisiel2, Sascha Koch1, Thilo Glatzel2, Ernst Meier2, and Armin Gölzhäuser1 — 1Faculty of Physics, Bielefeld University, 33615 Bielefeld, Germany — 2Department of Physics, University of Basel, 4056 Basel, Switzerland
Carbon Nano-Membranes (CNMs) are two-dimensional materials that are made by e.g. low- energy-electron irradiation induced cross-linking of Self-Assembled Monolayers (SAMs) of aromatic and organic molecules. The variation of different precursor molecules for the SAM and CNM formation allows not only to tune the properties of the final CNM but also to study the influence on the surface properties due to the specific SAM modification. Here we investigate the change in the work function of pristine SAMs and CNMs on a Au(111) substrate by means of Kelvin Probe Force Microscopy (KPFM) for different precursor molecules. The SAMs were partially cross-linked using a TEM-grid as a mask in order to compare the morphology and the work function of SAMs and CNMs simultaneously. Whereas no significant difference on the morphology due to the electron irradiation was observed, the analysis of the work function of pristine and cross-linked SAMs revealed a molecule dependent increase of the work function. On the one hand, this could be attributed to the modification of the dipole moment of the SAM and of the Au-S interface but also to the influence of different headgroups (H, NO2, CN) on the other hand.