This title appears in the Scientific Report :
2016
Please use the identifier:
http://hdl.handle.net/2128/12211 in citations.
Please use the identifier: http://dx.doi.org/10.1039/C6NR03776C in citations.
Tuning the structure and habit of iron oxide mesocrystals
Tuning the structure and habit of iron oxide mesocrystals
A precise control over the meso- and microstructure of ordered and aligned nanoparticle assemblies, i.e., mesocrystals, is essential in the quest for exploiting the collective material properties for potential applications. In this work, we produced evaporation-induced self-assembled mesocrystals wi...
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Personal Name(s): | Wetterskog, Erik (Corresponding author) |
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Klapper, Alice / Disch, Sabrina / Josten, Elisabeth / Rücker, Ulrich / Brückel, Thomas / Bergström, Lennart / Salazar-Alvarez, German (Corresponding author) / Hermann, Raphael | |
Contributing Institute: |
Streumethoden; JCNS-2 JARA-FIT; JARA-FIT Streumethoden; PGI-4 |
Published in: | Nanoscale, 8 (2016) 34, S. 15571-15580 |
Imprint: |
Cambridge
RSC Publ.
2016
|
DOI: |
10.1039/C6NR03776C |
Document Type: |
Journal Article |
Research Program: |
Jülich Centre for Neutron Research (JCNS) Materials and Processes for Energy and Transport Technologies Quantum Condensed Matter: Magnetism, Superconductivity Controlling Collective States Controlling Collective States |
Link: |
OpenAccess OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.1039/C6NR03776C in citations.
A precise control over the meso- and microstructure of ordered and aligned nanoparticle assemblies, i.e., mesocrystals, is essential in the quest for exploiting the collective material properties for potential applications. In this work, we produced evaporation-induced self-assembled mesocrystals with different mesostructures and crystal habits based on iron oxide nanocubes by varying the nanocube size and shape and by applying magnetic fields. A full 3D characterization of the mesocrystals was performed using image analysis, high-resolution scanning electron microscopy and Grazing Incidence Small Angle X-ray Scattering (GISAXS). This enabled the structural determination of e.g. multi-domain mesocrystals with complex crystal habits and the quantification of interparticle distances with sub-nm precision. Mesocrystals of small nanocubes (l = 8.6–12.6 nm) are isostructural with a body centred tetragonal (bct) lattice whereas assemblies of the largest nanocubes in this study (l = 13.6 nm) additionally form a simple cubic (sc) lattice. The mesocrystal habit can be tuned from a square, hexagonal to star-like and pillar shapes depending on the particle size and shape and the strength of the applied magnetic field. Finally, we outline a qualitative phase diagram of the evaporation-induced self-assembled superparamagnetic iron oxide nanocube mesocrystals based on nanocube edge length and magnetic field strength. |