Journal Article


Justin Holmes
Michael Morris



large scale high aspect ratio iron oxide space self assembled magnetic properties molecular weight chemistry

Size and space controlled hexagonal arrays of superparamagnetic iron oxide nanodots: magnetic studies and application Scientific reports (2013)

Abstract Highly dense hexagonally arranged iron oxide nanodots array were fabricated using PS-b-PEO self-assembled patterns. The copolymer molecular weight, composition and choice of annealing solvent/s allows dimensional and structural control of the nanopatterns at large scale. A mechanism is proposed to create scaffolds through degradation and/or modification of cylindrical domains. A methodology based on selective metal ion inclusion and subsequent processing was used to create iron oxide nanodots array. The nanodots have uniform size and shape and their placement mimics the original self-assembled nanopatterns. For the first time these precisely defined and size selective systems of ordered nanodots allow careful investigation of magnetic properties in dimensions from 50 nm to 10 nm, which delineate the nanodots are superparamagnetic, well-isolated and size monodispersed. This diameter/spacing controlled iron oxide nanodots systems were demonstrated as a resistant mask over silicon to fabricate densely packed, identical ordered, high aspect ratio silicon nanopillars and nanowire features.
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Full list of authors on original publication

Justin Holmes, Michael Morris

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Justin D. Holmes
University College Cork
Total Publications: 287
Michael A. Morris
University College Cork
Total Publications: 164