title: Hierachical Ni@Fe2O3 superparticles through epitaxial growth of γ-Fe2O3 nanorods on in situ formed Ni nanoplates.
abstract: One endeavour of nanochemistry is the bottom-up synthesis of functional mesoscale structures from basic building blocks. We report a one-pot wet chemical synthesis of Ni@γ-Fe2O3 superparticles containing Ni cores densely covered with highly oriented γ-Fe2O3 (maghemite) nanorods (NRs) by controlled reduction/decomposition of nickel acetate (Ni(ac)2) and Fe(CO)5. Automated diffraction tomography (ADT) of the Ni-Fe2O3 interface in combination with Mössbauer spectroscopy showed that selective and oriented growth of the γ-Fe2O3 nanorods on the Ni core is facilitated through the formation of a Fe0.05Ni0.95 alloy and the appearance of superstructure features that may reduce strain at the Ni-Fe2O3 interface. The common orientation of the maghemite nanorods on the Ni core of the superparticles leads to a greatly enhanced magnetization. After functionalization with a catechol-functional polyethylene glycol (C-PEG) ligand the Ni@γ-Fe2O3 superparticles were dispersible in water.
authors.affiliation: Institut für Anorganische Chemie und Analytische Chemie der Johannes Gutenberg-Universität, Duesbergweg 10-14, D-55099 Mainz, Germany. tahir@uni-mainz.de tremel@uni-mainz.de.
authors.forename: Muhammad Nawaz
authors.initials: MN
authors.lastname: Tahir
authors.affiliation: Institut für Organische Chemie, Johannes-Gutenberg-Universität, Duesbergweg 10-14, D-55099 Mainz, Germany and Graduate School Materials Science in Mainz, Staudinger Weg 9, 55128 Mainz, Germany.
authors.forename: Jana
authors.initials: J
authors.lastname: Herzberger
authors.affiliation: Institut für Anorganische Chemie und Analytische Chemie der Johannes Gutenberg-Universität, Duesbergweg 10-14, D-55099 Mainz, Germany. tahir@uni-mainz.de tremel@uni-mainz.de.
authors.forename: Filipe
authors.initials: F
authors.lastname: Natalio
authors.affiliation: Institut für Anorganische Chemie und Analytische Chemie der Johannes Gutenberg-Universität, Duesbergweg 10-14, D-55099 Mainz, Germany. tahir@uni-mainz.de tremel@uni-mainz.de.
authors.forename: Oskar
authors.initials: O
authors.lastname: Köhler
authors.affiliation: Institut für Physikalische Chemie, Johannes-Gutenberg-Universität, Welderweg 15, D-55099 Mainz, Germany.
authors.forename: Robert
authors.initials: R
authors.lastname: Branscheid
authors.affiliation: Institut für Physikalische Chemie, Johannes-Gutenberg-Universität, Welderweg 15, D-55099 Mainz, Germany.
authors.forename: Enrico
authors.initials: E
authors.lastname: Mugnaioli
authors.affiliation: Institut für Anorganische Chemie und Analytische Chemie der Johannes Gutenberg-Universität, Duesbergweg 10-14, D-55099 Mainz, Germany. tahir@uni-mainz.de tremel@uni-mainz.de.
authors.forename: Vadim
authors.initials: V
authors.lastname: Ksenofontov
authors.affiliation: Institut für Anorganische Chemie und Analytische Chemie der Johannes Gutenberg-Universität, Duesbergweg 10-14, D-55099 Mainz, Germany. tahir@uni-mainz.de tremel@uni-mainz.de.
authors.forename: Martin
authors.initials: M
authors.lastname: Panthöfer
authors.affiliation: Institut für Physikalische Chemie, Johannes-Gutenberg-Universität, Welderweg 15, D-55099 Mainz, Germany.
authors.forename: Ute
authors.initials: U
authors.lastname: Kolb
authors.affiliation: Institut für Organische Chemie, Johannes-Gutenberg-Universität, Duesbergweg 10-14, D-55099 Mainz, Germany.
authors.forename: Holger
authors.initials: H
authors.lastname: Frey
authors.affiliation: Institut für Anorganische Chemie und Analytische Chemie der Johannes Gutenberg-Universität, Duesbergweg 10-14, D-55099 Mainz, Germany. tahir@uni-mainz.de tremel@uni-mainz.de.
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Tremel