Berlin 2015 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 43: P8: Nanoparticles and Compsite Materials

CPP 43.11: Poster

Mittwoch, 18. März 2015, 10:00–13:00, Poster A

MUSIC mode AFM imaging of polystyrene-grafted functionalized graphene oxide — •Martin Dehnert¹, Eike-Christian Spitzner¹, Fabian Beckert², Christian Friedrich², and Robert Magerle¹ — ¹Chemische Physik, Fakultät für Naturwissenschaften, Technische Universität Chemnitz, Germany — ²Freiburger Material Forschungszentrum, Albert-Ludwigs-Universität, Freiburg, Germany

We investigate the surface morphology and the nanomechanical properties of organophilic stearylamine-modified graphene oxide (Stearyl-GO) sheets and a polystyrene-grafted functionalized graphene oxide (PS-g-FG) [1] using atomic force microscopy (AFM) operated in multi-set point intermittent contact (MUSIC) mode and force spectroscopy mode. This allows for depth-resolved mapping of the nanomechanical properties of the top surface layer of the functionalized graphene oxide (GO) sheets. On Stearyl-GO, we can distinguish areas of hydrophilic GO from hydrophobic stearylamine functionalized grafted areas. Exposure of PS-g-FG to chloroform vapor causes a selective-swelling and therefore a softening of the organic components stearyl and PS. This allows imaging the shape of the GO sheets embedded within the PS envelope. The GO sheets are folded and buckled in the PS envelope. The combination of swelling and MUSIC mode AFM imaging provides a detailed insight into the microstructure of functionalized GO sheets.

[1] Beckert F. et al.; Macromolecules, 2013, 46, 5488-5496