SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 77: Poster Session VI: Scanning probe techniques: Method development I
O 77.3: Poster
Mittwoch, 3. März 2021, 13:30–15:30, P
Bond-Level Imaging of Organic Molecules Using Q-Controlled Amplitude Modulation Atomic Force Microscopy — •Daniel Martin-Jimenez1,3, Alexander Ihle1,3, Sebastian Ahles2,3, Hermann A. Wegner2,3, André Schirmeisen1,3, and Daniel Ebeling1,3 — 1Institute of Applied Physics (IAP), Justus Liebig University Giessen, Heinrich-Buff-Ring 16, 35392 Giessen, Germany — 2Institute of Organic Chemistry, Justus Liebig University Giessen, Heinrich-Buff-Ring 17, 35392 Giessen, Germany — 3Center for Materials Research (LaMa), Justus Liebig University Giessen, Heinrich-Buff-Ring 16, 35392 Giessen, Germany
The bond imaging atomic force microscopy (AFM) technique has become an invaluable tool for studying organic molecules on surfaces. The functionalization of the AFM-tip with a single CO molecule improves the lateral resolution and allows to visualize the chemical structure of adsorbed organic molecules. Such experiments are usually performed at low temperatures in UHV environment in the frequency modulation (FM) mode. Here, we use the Q-controlled amplitude modulation (AM) mode for imaging organic molecules with CO-functionalized tips in constant-height mode. By reducing the effective quality factor (Qeff) of the sensor from about 20000-30000 to 1500-4000, we are able to image molecules with atomic resolution. By using appropriate imaging parameters, an increased effective signal-to-noise ratio is achieved in the Q-controlled AM mode (on the order of 30-60 %). This advantage over the conventional FM mode might, e.g., be used for increasing the experimental throughput.