Freiburg 2019 – wissenschaftliches Programm

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FM: Fall Meeting

FM 38: Enabling Technologies: Quantum Dots, Quantum Wires, Point Contacts and Excitonic Systems

FM 38.4: Talk

Dienstag, 24. September 2019, 14:45–15:00, 3043

Probing Formation of Conductive Mesocrystalline Superlattice of Nanocrystals on Liquid/Air Interface by in-situ X-ray Scattering — •Santanu Maiti1,2, Sonam Maiti2, Andrey Chumakov3, Marcus Scheele1, and Frank Schreiber11Forschungszentrum Jülich, Jülich, Germany — 2University of Tuebingen, Tuebingen, Germany — 3European Synchrotron Radiation Facility (ESRF), Grenoble, France

Directional cross-linking of organic semiconductors (OSC) with nanocrystals (NC) produces superlattices exhibiting novel structural and electronic properties [1,2]. We will present the result of a study on the in-situ formation of conductive, iso-oriented mesocrystalline superstructures with cubic PbS NCs at the acetonitrile/air interface, investigated simultaneously by grazing incidence small angle X-ray scattering (GISAXS) and grazing incidence X-ray diffraction (GIXD) in real-time [3]. We observe a continuous contraction of superlattices with elapsed time, preserving their superlattice symmetries and attribute these contractions to the complete replacement of native oleic acid ligands with small OSC cross-linker cobalt/copper tetraaminophthalocyanine [4]. Such investigations provide crucial visualizations into the formation mechanism of such nanostructures, which already find applications. [1] M. Scheele et al., Phys. Chem. Chem. Phys. 17, 97 (2015) [2] S. Maiti et al., J. Phys. Chem. Lett. 9, 739 (2018) [3] S. Maiti et al., J. Phys.: Condens. Matter 29, 095101 (2017) [4] S. Maiti et al, J. Phys. Chem. C 123, 1519 (2019)

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