A facile block copolymer inclusion technique for large scale monodisperse hexagonal arrays of superparamagnetic iron oxides nanodots

T. Ghoshal, T. Maity, J.F. Godsell, S. Roy, M.A. Morris
University College Cork, IE

Keywords: block copolymers, patterning, nanodots, magnetism, photoelectron spectroscopy


We demonstrate a simple and cost-effective route, based around block copolymer patterning, to create dense arrays of highly ordered iron oxide nanodots at substrate surface. The methodology creates hexagonally arranged features via a process of selective block copolymer inclusion and allows dimensional and structural control of both features and patterns at large scale. Spectroscopic, microscopic and magnetic measurements show the nanodots have uniform size and shape and their placement mimics the original self-assembled block copolymer pattern. The magnetic properties are quantified and are commensurate with well-isolated, size monodisperse nanodots exhibiting superparamagnetism, have potential biomedical applications. It is suggested that these nanodots have good thermal stability and strong adherence to the substrate surface, making them useful for technological applications.