Dr. Lars Klemeyer

Dr. Lars Klemeyer joined our lab in 2025 as a post-doc, working on resolving nanoparticle-protein interactions employing X-ray scattering and spectroscopy, e.g., by using anomalous small-angle X-ray scattering - ASAXS.(1).

After his time as a visiting scientist in the lab of Prof. Dr. Jiaxing Huang at Northwestern University (in 2019), where he described the Geometry depended reduction of Graphene Oxide solids,(2) and the Group of Prof. Dr. Serena de Beer at MPI for chemical energy conversion (in 2020), he continued his research as a PhD student in the Group of Prof. Dr. Dorota Koziej (2021-2025).

In his previous research, he resolved the emergence of electronic- and atomic structure during the solvothermal synthesis of ZnS nanomaterials by combining X-ray absorption and emission spectroscopy and X-ray scattering analysis, and complementary DFT calculations. Here, he discovered the formation of an [Zn(oleylthioamide)4]2+ complex by dissolution of Zn(Ac)2 and elemental sulfur in oleylamine, already at room temperature, and mapped the transition of HOMO/LUMO gap to a band structure during the synthesis. The results were published in the Journal of the American Chemical Society (3) and highlighted in a research spotlight on the ESRF webpage.

He also worked on investigating the synthesis of ZnS nanoparticles at the water-toluene interface, using a nano-focused beam for spatially resolved X-ray absorption spectroscopy, with complementary analysis using X-ray total scattering methods. Here, he monitored the diffusion of Zn2+ species through the water-toluene interface and revealed the formation of amorphous ZnS nuclei prior to the crystallization of ZnS nanoparticles, published in ACS nano.(4)

Selection of representative publications:

1. Skiba M, Klemeyer L, Guedes G, Sun X, Haas S, Cortajarena AL, et al. Probing the Biological Identity of Inorganic Nanoparticles with Anomalous Small Angle X-Ray Scattering. Small 2025, 2504135.

2. Klemeyer L, Park H, Huang J. Geometry-Dependent Thermal Reduction of Graphene Oxide Solid. ACS Materials Letters 2021, 3(5), 511-515.

3. Klemeyer L, Gröne TLR, Zito CdA, Vasylieva O, Gumus Akcaalan M, Harouna-Mayer SY, et al. Utilizing High X-ray Energy Photon-In Photon-Out Spectroscopies and X-ray Scattering to Experimentally Assess the Emergence of Electronic and Atomic Structure of ZnS Nanorods. Journal of the American Chemical Society 2024, 146(49, 33475-33484.

4. Klemeyer L, Caddeo F, Gröne TLR, Harouna-Mayer SY, Jessen B, Zito CA, et al. Spatially Resolved In Situ X-ray Absorption Spectroscopy Studies of ZnS Nanoparticle Synthesis at the Water–Toluene Interface. ACS Nano 2025, 19(28), 25710-25719.