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O: Fachverband Oberflächenphysik
O 21: Interfaces and Thin Films I (joint session CPP/DY/O)
O 21.3: Vortrag
Montag, 16. März 2020, 17:00–17:15, ZEU 260
Self-assembly of large magnetic nanoparticles in ultrahigh molecular weight linear diblock copolymer films — •Wei Cao1, Senlin Xia1, Xinyu Jiang1, Markus Gallei2, Matthias Opel3, Matthias Schwartzkopf4, Stephan V. Roth4,5, and Peter Müller-Buschbaum1 — 1TU München, Physik-Department, LS Funktionelle Materialien, 85748 Garching — 2Saarland University, Chair in Polymer Chemistry, 66123 Saarbrücken — 3Walther-Meissner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching — 4DESY, Notkestrasse 85, 22603 Hamburg — 5KTH Royal Institute of Technology, FPT, SE-100 44 Stockholm, Sweden
The fabrication of diblock copolymer nanocomposite films that consist of magnetic nanoparticles (NPs) with diameters (D) of more than 20 nm is a challenging task. Herein, ultrahigh molecular weight (UHMW) linear polystyrene-block-poly(methyl methacrylate) (PS-b-PMMA) diblock copolymer is spin-coated as a template for the self-assembly of large iron oxide NPs (D = 27 nm), and the morphology of hybrid nanocomposites is governed by the concentration of the iron oxide NPs. The NPs are functionalized with carboxylic acid groups showing an affinity to the PMMA blocks. Due to the rearrangement of the polymer chains for accommodating the NPs, well-ordered spherical nanostructures are readily generated at a NP concentration of 0.5 wt%. Most interestingly, a chain-like network appears inside the hybrid films at a high NP loading. All hybrid films show ferromagnetism at room temperature, proven with a superconducting quantum interference device magnetometer.