Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 29: Nanostructures at Surfaces III: Dots, Particles, and Clusters
O 29.9: Vortrag
Dienstag, 2. April 2019, 12:30–12:45, H25
Soft Epitaxial Superlattices of PbS Nanocrystals — •Santanu Maiti1,2, Alexander André3, Sonam Maiti2,3, Martin Hodas2, Maciej Jankowski4, Marcus Scheele3, and Frank Schreiber2 — 1Institute of Complex Systems, Forschungszentrum Jülich, Germany — 2Institute of Applied Physics, University of Tübingen, — 3Institute of Physical and Theoretical Chemistry, University of Tübingen, Germany — 4ID10, European Synchrotron Radiation Facility, France
We prepare templates of atomically coherent, ordered superlattices of PbS NCs, coupled with copper tetraaminophthalocyanines (CuTAPc) molecules [1,2]. PbS NCs of different sizes/shapes are deposited on the surface of templates and the adlayer superlattices are further functionalized with CuTAPc [2]. Here, we investigate the structure of the templates as well as the adlayer NC assemblies by using grazing-incidence small angle x-ray scattering (GISAXS), grazing incidence x-ray diffraction (GIXD) and electron microscopy [3]. The deposited NCs self-assemble not only into ordered superstructures (sc, bcc), but also into a preferred atomic orientation with respect to the templates. Moreover, after functionalization, the bcc superlattices undergo a remarkable orientational change from [110]SL to [100]SL via lattice reconstruction. These results provide new insight into the coherent design of epitaxial nanostructures with desired crystallographic orientation [4,5]. [1] M. Scheele et al, PCCP 2015, 17, 97; [2] S. Maiti et al, JPCL 2018, 9, 739-744; [3] S. Maiti et al, JPCM 2017, 29, 095101; [4] S. M. Rupich et al, Nat Commun. 2014, 5, 5045; [5] M. X. Wang et al, ACS Nano 2017, 11, 180-185.