Regensburg 2019 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 35: Topical session (Symposium MM): Correlative and in-situ Microscopy in Materials Research

MM 35.5: Talk

Thursday, April 4, 2019, 12:15–12:30, H45

Correlative in situ microscopy studies of highly directional nanowires — •Lilian Vogl, Peter Schweizer, Mingjian Wu, and Erdmann Spiecker — FAU Erlangen-Nürnberg, IMN

Here we present a novel approach to synthesize Molybdenum oxide nanowires from Molybdenum Disulfide (MoS2) in situ, using microscopy as a direct feedback-mechanism enabling parameter optimization as well as the analysis of growth kinetics. The Nanowire Synthesis is carried out in an in situ Light Microscopy heating chamber under controlled oxygen atmosphere. This allows us to directly measure the growth rate using digital image correlation and determine the influence of temperature and pressure on the synthesis. Correlative Electron Microscopy and spectroscopy is used to characterize the crystal structure and growth direction as well as to analyze the chemical composition of the wires. The diameter of the synthesized nanowires is typically between 15 to 250 nm with a length of up to several tens of micrometers. The growth of the wires is highly directional and follows the [11-20] directions of MoS2. In Addition to the analysis of the growth behavior of the nanowires, the functional properties are elucidated. To determine the electrical properties of the wires in situ four probe measurement in an SEM are performed on the micro-scale. The U-I sweep shows a linear behavior of the nanowires corresponding to an ohmic conductor. Currently in situ bending tests and Resonance measurements are done to evaluate the mechanical properties of the nanowires.