Welcome to the Nickel Research Group

We utilize advanced x-ray techniques to study the nucleation and growth of complex materials, as well as their response to external stimuli. We operate a state-of-the-art x-ray lab and conduct experiments at synchrotron facilities, including DESY. Our research focuses on soft matter systems, such as lipids and DNA origami, and semiconductor materials, including organic electronics and perovskites.

Nanoclusters form supercrystals
© C. Hohmann (LMU)

Advanced Materials

C. Hohmann (LMU)

We study the structure and function of new materials. For this purpose, we run a state-of-the-art x-ray lab at LMU in Munich, and we travel for experiments to synchrotron radiation facilities such as DESY in Hamburg and ESRF in Grenoble. For specific questions we also use neutron diffraction. In the field of semiconductor materials, our focus is on the nucleation and growth of colloidal quantum dots, which we study by small angle x-ray scattering (SAXS), Bragg diffraction, and total scattering. Furthermore, we develop new fabrication schemes for organic field effect transistors and characterize their thin film and interface structure by x-ray surface diffraction. In the field of biophysics, we study the folding and unfolding of rather large DNA origami structures, and their silicification and actuation by solvents. Another soft matter system that we study intensively are lipid assemblies. Here, our present focus is on empolying photoswitchable lipids to induce phase transitions in lipid assemblies. Here is a link to all our publications: Orcid-ID

X-rays

Our X-ray lab features two SAXS setups for research and a Laue experiment for teaching. We can measure powder XRD, X-ray reflectometry, and grazing incidence SAXS and WAXS. If you’re interested in using any of these methods for your research, please reach out to Bert Nickel.

  1. The x-ray lab of the Nickel group.
  2. Happy users at DESY.

The photo shows the sample station of our compact Molybdenum x-ray source SAXS setup. This setup allows us to position various samples in the x-ray beam, including liquids in capillaries, powder samples, samples for cryogenic temperatures (70 K), and thin film samples for surface studies.

© LMU

The DESY campus in Hamburg is like a small science city. We typically spend several days there during experiments. This photo was taken in April 2024, when we visited DESY beamline P62 to study photoswitchable lipids, the formation of COFs, and perovskite nanoparticles.

© Bert Nickel

This is a detector image showing x-ray intensities obtained at beamline P62 at DESY. The bright ring in the SAXS signal indicates the formation of a supercrystal, i.e., a large crystal composed of small CuPd crystallites. The supercrystal forms through self-assembly after synthesis during cooling. Additional details are available at Small (https://doi.org/10.1002/smll.202311714).

High-energy x-ray diffraction enables the recording of many Bragg reflections in a single exposure. The detector image shown here was recorded at P07, a DESY beamline that provides x-rays at energies up to 150 keV. We used such high-energy x-rays to study photocatalytic CuBi2O4 electrodes under operando conditions, in collaboration with the group of Prof. Dorota Kożiej (UHH). Further details can be found in Angewandte Chemie (https://onlinelibrary.wiley.com/doi/full/10.1002/anie.202307948).

Master and Bachelor theses

In our group, you will learn how to use x-ray diffraction techniques and advanced optical characterization methods. Some projects also involve cleanroom fabrication techniques and electrical transport measurements. Many of our projects involve recording experimental data using instruments that we build ourselves from highly specialized modules, often as part of a Master’s or PhD thesis. You will also gain experience in data processing and analysis using scientific software. Many projects involve adapting Python scripts or working on small electronics projects. Here you find a collection of past PhD, Master and Bachelor theses of the Nickel group. Currently, we offer Bachelor’s and Master’s theses on the following topics:

Group members

Name Position
Frank, Kilian PhD Student
Kammerbauer, Theresa PhD Student
Kostyurina, Ekaterina Postdoc
Nickel, Bert Chair of Experimental Physics - Soft Condensed Matter
Reisner, Veronika PhD Student
Rescher, Lukas Master Student
Cao, Tianyi Master Student