Master Theses

In this work, the synthesis of star-shaped octapod iron oxide nanoparticles was analyzed. The synthesis is based on the thermal decomposition of iron(II) oleate, which in turn wassynthesized from iron(II) carbonate and oleic acid. [...]

Platinum palladium alloy nanoparticles are of high interest because of their role ascatalysts for different processes, including exhaust control and methane oxidation. Cata-lyst behavior is determined by the shape, structure and alloy composition of the particles.To enhance catalyst efficiency, it is thus necessary to improve our understanding of thestructure of the nanoparticles and the active adsorption sites. [...]

Silicon Photo-Multipliers (SiPMs) are pixelated semiconductor detectors consisting of SPADs, usually used as single-photon sensitive detectors. SiPMs are often analog devices that require separate digitization. [...]

AbstractThis master’s thesis explores the ageing effects, offset calibration, and cross-talk inthe pixel vertex detector (PXD) of the Belle II experiment. The PXD is the innermostdetector of the Belle II experiment, consisting of self-supporting ladders using DEP-FET technology. [...]

In the search for physics beyond the Standard Model, research in particle physics aims to probe particle interactions at high energies and strives for better precision on measurements. Experiments such as Belle II target higher luminosities to push the precision frontier. [...]

Before the successful detection of gravitational waves (GWs) with LIGO and VIRGO, superconductingradio frequency (SCRF) cavities were already considered as potential alternativesfor large laser interferometers. They are particularly suited to probe high frequencies above∼ 10 kHz by using a heterodyne approach where the GW has to be resonant with the frequencydifference of two cavity eigenmodes. [...]

he Atomic Pair Distribution Function (PDF) is the Fourier analysis of total scattering data including Bragg as well as diffuse scattering. Contrary to the conventional diffraction studies, which solely consider Bragg scattering contributions and thus only access to the long range ordering information, the PDF yields short and intermediate range ordering information [...]

Transition metal oxides are promising materials for photoanodes in devices for photoelectrochmical water splitting. TiO$_2$ was the first photoactive material used in an electrochemical cell in 1972 and recently also hematite ($\alpha$-Fe$_2$O$_3$) has drawn much attention [...]

The numerous advantages of filamentous fungal-pellets for the production of various products, such as citric acid, attract the attention of researchers and industrial engineers. In this regard, it is important to study the morphology of the fungal pellets, as it has a great impact on productivity. [...]