Publication Type:Journal Article
Source:Nano Letters, Volume 6, Number 7, p.1401-1407 (2006)
Keywords:aluminum oxide, anisotropy, Article, bismuth compounds, Calcium compounds, calcium derivative, chemistry, Interfacial energy, magnesium oxide, nanomaterial, Nanopillars, nanostructured materials, Nanostructures, oxide, oxides, Perovskite, Perovskite spinel nanostructures, Self assembly, Single crystal substrates, Single crystals, spinell, substrates, Surface energy anisotropy, titanium
We report a discovery that self-assembled perovskite-spinel nanostructures can be controlled simply by selecting single-crystal substrates with different orientations. In a model BiFeO 3-CoFe 2O 4 system, a (001) substrate results in rectangular-shaped CoFe 2O 4 nanopillars in a BiFeO 3 matrix; in contrast, a (111) substrate leads to triangular-shaped BiFeO 3 nanopillars in a CoFe 2O 4 matrix, irrespective of the volume fraction of the two phases. This dramatic reversal is attributed to the surface energy anisotropy as an intrinsic property of a crystal. © 2006 American Chemical Society.
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