Freiburg 2019 – wissenschaftliches Programm
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FM: Fall Meeting
FM 63: Poster: Enabling Technologies: Quantum Materials, Quantum Dots, Quantum Wires, Point Contacts and Superconducting Systems
FM 63.7: Poster
Mittwoch, 25. September 2019, 16:30–18:30, Tents
In Situ Probing of Conductive Superlattices Formation of Cu1.1S Nanodisks at the Liquid/Air Interface — •Sonam Maiti1,2, Santanu Maiti1, Marcus Scheele2, and Frank Schreiber1 — 1Institute of Applied Physics, University of Tuebingen, Tübingen, Germany — 2Institute of Physical and Theoretical Chemistry, University of Tübingen, Tübingen, Germany
Assembling of colloidal NCs with anisotropic shape into ordered superstructures is one of the existing challenges in nano-fabrication [1,2]. We report the formation of conductive superlattices of Cu1.1S nanodisks through directional cross-linking with CoTAPc molecule at the liquid/air interface monitored by real-time GISAXS. We investigate the structure, symmetry and lattice parameters of the superlattices, formed during solvent evaporation and ligand exchange with elapsed time. Cu1.1S nanodisks self-assemble into 2D hexagonal superlattice with minor in-plane contraction and continuous contraction during ligand exchange reaction. This attributes to the continuous replacement of the native oleylamine surface ligands with smaller CoTAPc molecules. The NDs has a preferential atomic orientation in the superlattices with respect to the substrates. The subsequent superlattices show high electrical conductivity, which corresponds to the successful cross-linking of the nanodisks. Our work thus provides a correlation between the structure and transport of the coupled superstructures of organic and inorganic NCs with anisotropic shape. [1] Saunders et al, Nano Lett. 2006, 6, 12. [2] Maiti et al, JPCL 2018, 9, 4.