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Issue 8, 2017
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Shape-controlled syntheses of metal oxide nanoparticles by the introduction of rare-earth metals

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Abstract

Here, we report the size- and shape-controlled synthesis of metal oxide nanoparticles through the introduction of rare-earth metals. The addition of gadolinium oleate in the synthesis of iron oxide nanoparticles induced sphere-to-cube shape changes of nanoparticles and generated iron oxide nanocubes coated with gadolinium. Based on experimental investigations and density functional theory (DFT) calculations, we attribute the shape change to the facet-selective binding of undecomposed gadolinium oleates. While many previous studies on the shape-controlled syntheses of nanoparticles rely on the stabilization of specific crystal facets by anionic surfactants or their decomposition products, this study shows that the interaction between growing transition metal oxide nanoparticles and rare-earth metal complexes can be used as a robust new mechanism for shape-controlled syntheses. Indeed, we demonstrated that this approach was applicable to other transition metal oxide nanoparticles (i.e., manganese oxide and manganese ferrite) and rare earth metals (i.e., gadolinium, europium, and cerium). This study also demonstrates that the nature of metal–ligand bonding can play an important role in the shape control of nanoparticles.

Graphical abstract: Shape-controlled syntheses of metal oxide nanoparticles by the introduction of rare-earth metals

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Supplementary files

Article information


Submitted
25 Sep 2016
Accepted
15 Nov 2016
First published
15 Nov 2016

Nanoscale, 2017,9, 2732-2738
Article type
Paper

Shape-controlled syntheses of metal oxide nanoparticles by the introduction of rare-earth metals

H. Song, N. Kim, J. Park, J. Ko, R. J. Hickey, Y. Kim and S. Park, Nanoscale, 2017, 9, 2732
DOI: 10.1039/C6NR07555J

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