Lilian Vogl, M. Sc.
I finished my Master thesis at the chair of Prof. Spiecker in 2018 on the topic about a novel in situ synthesis method of molybdenum dioxide nanowires from layered crystals of molybdenum disulfide. From that time on, I got fascinated by the diverse properties of low-dimensional transition metal oxides and chalcogenides. Being amazed by the capabilities and insights of in situ microscopy, I therefore decided to pave my enthusiasm to continue pursue a PhD, further exploring the expanding and vibrant research field of one-dimensional nanostructures and nanomechanics. My current research topic includes synthesis and studies of functional properties of low-dimensional transition metal oxides and chalcogenides, for the development of next generation nano-devices, in applications like sensors or as ultrasensitive force measurement methods. In my free time, I get my ideas during my ambitious tri-athletic sports workout, combining running, swimming and cycling. Furthermore, I act out my creativity by painting and printing techniques like linocut or serigraphy.
During the semester, I supervise, together with my colleagues, the practical course of advanced Light microscopy. This course gives the students an understanding of different contrast methods. Besides that, I also share the responsibility to run the PVD Sputtering instruments and the in situ heating devices for the light microscope. Currently, a Bachelor student is working with me on the dewetting phenomenon of thin films. In this Bachelor project, we performe in situ electrical measurements during heating of thin films to study the conductivity of the dewetted films in relation to the microstructure.
By using different microscopic techniques and in situ approaches, I perform mechanical and electrical testing of single nanowires. Currently I dive into the elastic mechanical behaviour of single crystalline metal nanowires and analyze the size effect on small scale. Next to conventional tensile test in the SEM based on a spring table, we established in situ resonance measurements via electrical excitation for the Youngs’ modulus evaluation and furthermore analyze the vibrational properties and damping behavior of nano-beams. Based on the detailed characterization, the nanowires are used as cantilevers to measure forces with ultrahigh sensitivity. Depending on the chosen cantilever, forces in the range of few pN up to µN can be resolved, which allows to measure attractive adhesion forces as well as forces involved during manipulation of single dislocations.
Transforming layered MoS2 into functional MoO2 nanowires
In: Nanoscale 11 (2019), p. 11687-11695
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