Berlin 2015 – wissenschaftliches Programm

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BP: Fachverband Biologische Physik

BP 5: Nanoparticles and Composite Materials I (joint CPP/BP)

BP 5.10: Vortrag

Montag, 16. März 2015, 12:15–12:30, C 243

Metal nanopattering using block copolymers: Differences between ionic and atomic metal selectivity — •Ezzeldin Metwalli¹, Yuan Yao¹, Volker Körstgens¹, Matthias Schwartzkopf², Stephan V. Roth², and Peter Müller-Buschbaum¹ — ¹TU München, Physik-Department, LS Funktionelle Materialien, James-Franck-Str. 1, 85748 Garching — ²DESY, Notkestr. 85, 22607 Hamburg

Metal nano-patterns with a particular structural symmetry, characteristic length scale and periodicity are of growing interest, e.g. for photonic applications and high-density memory devices. The characteristic metal affinity towards the minority block of the self-assembled block copolymer (BC) templates plays an essential role to fabricate highly-order and well-defined metal nanopatterns [1]. Though, ions of metal are highly selective towards the ionic polymer block, the metal atoms show an opposite behavior, an extreme selectivity towards the neutral block. A simple explanation based on like-dissolves-like is ruled out. Experiments are performed by depositing gold in its atomic state on several homopolymer and block copolymer films with DC magnetron sputtering. At time resolution of 15 milliseconds, the nucleation/growth kinetics of gold nanoparticles on the polymer films is monitored using in-situ GISAXS. An extreme selectivity of the metal atoms is observed on the neutral block with an exponential growth of metal particle size. The coalescence behavior of the inert metal is mainly dominated by the improved atom mobility within the neutral polymer block. [1] Metwalli et al. ChemPhysChem 15, 2236 (2014)