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Title: Tuning the structure and habit of iron oxide mesocrystals

Journal Article · · Nanoscale
DOI:https://doi.org/10.1039/C6NR03776C· OSTI ID:1319205
 [1];  [2];  [3];  [4];  [5];  [2];  [2];  [6];  [6]
  1. Stockholm Univ. (Sweden). Dept. of Materials and Environmental Chemistry; Uppsala Univ. (Sweden). Angstrom Lab., Dept. of Engineering Sciences
  2. Forschungszentrum Julich (Germany). Juelich Centre for Neutron Science (JCNS), Peter Grunberg Inst. PGI, JARA-FIT
  3. Univ. zu Koln (Germany). Dept. of Chemistry
  4. Forschungszentrum Julich (Germany). Juelich Centre for Neutron Science (JCNS), Peter Grunberg Inst. PGI, JARA-FIT; Helmholtz-Zentrum Dresden-Rossendorf, Dresden (Germany). Inst. of Ion Beam Physics and Materials Research
  5. Forschungszentrum Julich (Germany). Juelich Centre for Neutron Science (JCNS), Peter Grunberg Inst. PGI, JARA-FIT; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
  6. Stockholm Univ. (Sweden). Dept. of Materials and Environmental Chemistry

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.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725; FP7- NMP-604448; PIEF-GA-2011- 298918; DI 1788/2-1
OSTI ID:
1319205
Journal Information:
Nanoscale, Vol. 8, Issue 34; ISSN 2040-3364
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 25 works
Citation information provided by
Web of Science

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Cited By (7)

From Solute, Fluidic and Particulate Precursors to Complex Organizations of Matter journal March 2018
Nanocrystal superlattices as phonon-engineered solids and acoustic metamaterials journal September 2019
Superlattice growth and rearrangement during evaporation-induced nanoparticle self-assembly journal June 2017
Strong size selectivity in the self-assembly of rounded nanocubes into 3D mesocrystals text January 2020
Strong size selectivity in the self-assembly of rounded nanocubes into 3D mesocrystals text January 2020
Strong size selectivity in the self-assembly of rounded nanocubes into 3D mesocrystals journal January 2020
Nanocrystal superlattices as phonon-engineered solids and acoustic metamaterials text January 2019