Dresden 2017 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 57: Thin Films, Nanostructures and Nanoparticles I

CPP 57.3: Vortrag

Donnerstag, 23. März 2017, 10:45–11:00, ZEU 114

Selective metal deposition on block copolymer nanotemplates: A new perspective — •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

The characteristic metal affinity towards one block of self-assembled block copolymer (BC) templates plays an essential role to fabricate highly-order and well-defined metal nanopatterns. Deposition of inert metal atoms on several BC nanotemplates shows an extreme selectivity towards the glassy polymer nanodomain [1]. An explanation based on a difference in the metal-polymer interaction energy cannot adequately explain such extreme affinity. To better investigate this phenomenon, RF magnetron sputtering system was used to deposit gold metal in its atomic state on glassy poly(methylmethacrylate) and soft poly(ethylhexylacrylate) amorphous homopolymers as well as the corresponding statistical copolymer P(EHA-stat-MMA). At time resolution of 15 milliseconds, the nucleation/growth kinetics of gold nanoparticles on these polymer films was monitored using in situ grazing incidence small angle X-ray scattering (GISAXS). The coalescence behavior of the inert metal is mainly dominated by an improved atom mobility within the glassy polymers. This study on polymer thin films provides a new perspective into the long-time debated high selectivity characteristics of metals towards one block of BC based nanotemplates. [1]S. V. Roth et al., ACS Appl Mater Inter 2015, 7, 12470.