Regensburg 2016 – wissenschaftliches Programm
CPP 45.6: Poster
Mittwoch, 9. März 2016, 18:15–21:00, Poster B2
2D-sheets covering and replicating single dendronized polymers — •Mohammad Fardin Gholami1, Simone Dell'Elce1, Vitalij Scenev1, Nikolai Severin1, Baozhong Zhang2, A. Dieter Schlüter2, and Jürgen P. Rabe1 — 1Institute für Physik & IRIS Adlershof, Humboldt-Universität zu Berlin — 2Department of Materials, Institute of Polymers, ETH Zurich
Graphene can replicate the topography of a substrate with a precision down to single macromolecules. Here we use this capability and investigate graphene and derivatives thereof for single macromolecules with increasing cross-sections. We deposited dendronized polymers (denpols) onto mica substrates and covered them with graphene oxides (GO), reduced graphene oxides (rGO), and graphenes. The denpols consist of a linear backbone surrounded by a cladding of structurally regular dendritic branches (dendrons), anchored to each repeat unit. The diameter of denpols can be systematically tuned by varying the dendron generation. The height of the molecular imprints in GO agrees well with the height of uncovered molecules. The height of molecular imprints in graphenes is smaller than the height of uncovered molecules with the difference growing with the dendron generation. First results for rGO indicate that the heights of molecular imprints in rGO are in between those for graphene and GO. We attribute the smaller heights under graphenes and rGO to a larger interaction between the sheets and the substrate, effectively squeezing the molecules, implying that the GO-substrate interaction is smaller than that of graphene, allowing for less distortion of the single macromolecules.