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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 24: Poster Session I

CPP 24.22: Poster

Montag, 16. März 2020, 17:30–19:30, P3

Unraveling kinetically driven self-assembly of nanoplatelets — •Nanning Petersen, Rebecca Momper, Martin Girard, Andreas Riedinger, and Omar Valsson — Max Planck Institute for Polymer Research, Ackermannweg 10, D-55128 Mainz

CdSe can form thin rectangular semiconductor nanoparticles. These nanoplatelets are remarkably uniform in thickness and size [1]. To make use of their extraordinary properties the colloidal particles have to be collectively orientated in solid state films. Previous experiments in our group have demonstrated that effective control over the collective orientation can be gained by exploiting kinetic effects in the self-assembly process. This yields well defined monolayer films with controlled nanoplatelet orientation. Through variation of the solvent, the temperature or the partial pressure the evaporation rate can be tuned, yielding monolayers with nanoplatelets either orientated "face-down" or "edge-up". However, the mechanism behind the kinetically driven self-assembly is not well understood.

Recently there have been major efforts to understand self-assembly processes in different nanoparticle systems. Molecular simulations have been proven to be a promising strategy to get a microscopic understanding of these processes. For nanoplatelets we have taken the first steps in this direction by employing coarse-grained molecular dynamics simulations using the MARTINI force field. Here we present our initial results on model nanoplatelet systems.
[1] A. Riedinger et al., Nat. Mater. 16, 743-748 (2017)