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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 29: Nanostructures, Nanostructuring and Nanosized Soft Matter I

CPP 29.7: Vortrag

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

Spray-mediated shear forces versus topographical confinement: controlling the orientation of silver nanowires — •Patrick T. Probst¹, Sribharani Sekar^1,2, Tobias A.F. König^1,3, Petr Formanek¹, Gero Decher², Andreas Fery^1,3, and Matthias Pauly² — ¹Leibniz-Inst. für Polymerforschung Dresden e.V., Germany — ²Université de Strasbourg, CNRS, Inst. Charles Sadron, France — ³Centre for Adv. Electronics Dresden, Germany

Grazing Incidence Spraying is known to enable linear arrangement of 1-dimensional nanoparticles facilitated by the arising shear forces. That way, optically and electrically anisotropic thin films of a vast variety of materials (metal, semiconductor, nanofibrils) can be readily produced on macroscopic scales (>5×5 mm²).

Surprisingly, parallel surface corrugations on the receiver substrate not only render the process more robust against rotational offsets during preparation, but, more interestingly, they can even reorient the particles by 90^∘ to be parallel to the corrugations again. Controlling the balance between shear forces and topographical confinement opens new ways for constructing complex nano-patterns. We show how the microscopic linear arrangement of AgNWs evaluated by scanning electron microscopy (order parameter >0.9) reflects in a pronounced macroscopic optical anisotropy measured by conventional polarized UV-Vis-NIR spectroscopy.

S. Sekar, V. Lemaire, H. Hu et al. Faraday Discuss. 2016, 191, 373.
H. Hu, M Pauly, O. Felix et al. Nanoscale 2017, 9, 1307.
S. Sekar, P.T. Probst, M. Pauly et al., submitted.