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Printed Thin Diblock Copolymer Films with Dense Magnetic Nanostructure
Tech Univ Munich, Phys Dept, Lehrstuhl Funktionelle Mat, Garching, Germany..ORCID iD: 0000-0002-6259-0689
Tech Univ Munich, Phys Dept, Lehrstuhl Funktionelle Mat, Garching, Germany.;Northwestern Polytech Univ, Inst Flexible Elect, West Youyi Rd 127, Xian 710072, Shaanxi, Peoples R China..ORCID iD: 0000-0003-4971-6301
Tech Univ Munich, Phys Dept, Lehrstuhl Funktionelle Mat, Garching, Germany..
Tech Univ Munich, Phys Dept, Lehrstuhl Funktionelle Mat, Garching, Germany..
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2019 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 11, no 24, p. 21935-21945Article in journal (Refereed) Published
Abstract [en]

Thin hybrid films with dense magnetic structures for sensor applications are printed using diblock copolymer (DBC) templating magnetic nanoparticles (MNPs). To achieve a high-density magnetic structure, the printing ink is prepared by mixing polystyrene-block-poly(methyl methacrylate) (PS-b-PMMA) with a large PS volume fraction and PS selective MNPs. Solvent vapor annealing is applied to generate a parallel cylindrical film morphology (with respect to the substrate), in which the MNP-residing PS domains are well separated by the PMMA matrix, and thus, the formation of large MNP agglomerates is avoided. Moreover, the morphologies of the printed thin films are determined as a function of the MNP concentration with real and reciprocal space characterization techniques. The PS domains are found to be saturated with MNPs at 1 wt %, at which the structural order of the hybrid films reaches a maximum within the studied range of MNP concentration. As a beneficial aspect, the MNP loading improves the morphological order of the thin DBC films. The dense magnetic structure endows the thin films with a faster superparamagnetic responsive behavior, as compared to thick films where identical MNPs are used, but dispersed inside the minority domains of the DBC.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2019. Vol. 11, no 24, p. 21935-21945
Keywords [en]
hybrid films, diblock copolymer, magnetic nanoparticles, GISAXS, superparamagnetic behavior
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-255484DOI: 10.1021/acsami.9b06573ISI: 000472683300073PubMedID: 31136716Scopus ID: 2-s2.0-85067398830OAI: oai:DiVA.org:kth-255484DiVA, id: diva2:1352687
Note

QC 20190919

Available from: 2019-09-19 Created: 2019-09-19 Last updated: 2019-09-19Bibliographically approved

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Roth, Stephan V.

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