Berlin 2018 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 11: Responsive and Adaptive Systems

CPP 11.7: Vortrag

Montag, 12. März 2018, 12:45–13:00, C 230

Single dendronized macromolecules as force probes for 2D interaction forces — •Mohammad Fardin Gholami¹, Jose D. Cojal Gonzalez¹, Simone DellElce¹, Vitalij Scenev¹, Nikolai Severin¹, Baozhong Zhang², A. Dieter Schlüter², and Jürgen P. Rabe¹ — ¹Department of Physics & IRIS Adlershof, Humboldt-Universität zu Berlin — ²Department of Materials, Institute of Polymers, ETH Zürich

Graphene can replicate the topography of a substrate with a precision down to single macromolecules [1]. Here we use this capability and investigate the deformation of the macromolecules under graphene based 2D materials.We sandwiched cylindrically shaped dendronized polymers (denpols) between mica and graphene oxides (GO), reduced graphene oxides (rGO), and graphenes. The cross section of the denpols can be systematically varied through the dendron generation. The height of the molecular imprints in GO agrees with the height of those on bare mica while the height of molecular imprints in graphenes are smaller than the height of uncovered molecules, with the difference growing with the dendron generation. The heights of molecular imprints in rGO are in between those for graphene and GO. We attribute this to a larger interaction between those sheets and the mica, effectively squeezing the molecules as observed also in steered MD simulations. The combination of these experimental and theoretical results imply that it is possible to measure the interaction forces between 2D sheets and substrates by using the macromolecules as force sensors.

[1] N. Severin, et al. Nano Lett. 11 (2011) 2436.