Universität zu Köln

Wetterskog, Erik, Klapper, Alice, Disch, Sabrina ORCID: 0000-0002-4565-189X, Josten, Elisabeth ORCID: 0000-0002-9019-1167, Hermann, Raphael P., Ruecker, Ulrich, Brueckel, Thomas, Bergstrom, Lennart ORCID: 0000-0002-5702-0681 and Salazar-Alvarez, German ORCID: 0000-0002-0671-435X (2016). Tuning the structure and habit of iron oxide mesocrystals. Nanoscale, 8 (34). S. 15571 - 15581. CAMBRIDGE: ROYAL SOC CHEMISTRY. ISSN 2040-3372

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Abstract

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.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Wetterskog, Erik UNSPECIFIED UNSPECIFIED UNSPECIFIED Klapper, Alice UNSPECIFIED UNSPECIFIED UNSPECIFIED Disch, Sabrina UNSPECIFIED orcid.org/0000-0002-4565-189X UNSPECIFIED Josten, Elisabeth UNSPECIFIED orcid.org/0000-0002-9019-1167 UNSPECIFIED Hermann, Raphael P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ruecker, Ulrich UNSPECIFIED UNSPECIFIED UNSPECIFIED Brueckel, Thomas UNSPECIFIED UNSPECIFIED UNSPECIFIED Bergstrom, Lennart UNSPECIFIED orcid.org/0000-0002-5702-0681 UNSPECIFIED Salazar-Alvarez, German UNSPECIFIED orcid.org/0000-0002-0671-435X UNSPECIFIED
URN:	urn:nbn:de:hbz:38-289335
DOI:	10.1039/c6nr03776c
Journal or Publication Title:	Nanoscale
Volume:	8
Number:	34
Page Range:	S. 15571 - 15581
Date:	2016
Publisher:	ROYAL SOC CHEMISTRY
Place of Publication:	CAMBRIDGE
ISSN:	2040-3372
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Chemistry > Institute of Physical Chemistry
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SELF-ASSEMBLED STRUCTURES; MAGNETIC-FIELD; NANOPARTICLE ASSEMBLIES; COBALT NANOCRYSTALS; BUILDING-BLOCKS; ORDERED ARRAYS; NANOCUBES; CRYSTALLIZATION; SUPERLATTICES; ORIENTATION Multiple languages Chemistry, Multidisciplinary; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/28933