BaTiO-CaTiO and SrTiO-BaTiO core-shell nanocubes were synthesized through the surface reconstruction of BaTiO nanocubes, which involved the reaction of titanium oxide with Ca(OH), Sr(OH), or Sr(OH)·8HO in water at 100 °C. The core-shell structure comprised a BaTiO nanocube core and a CaTiO or SrTiO shell. The outermost layer with a perovskite structure also comprised CaTiO or SrTiO, and its thickness was several hundred picometers. The thinnest layer was constructed of only one layer of CaTiO or SrTiO. This is the first presented work on a core-shell nanocube with the outermost layer consisting of only CaTiO or SrTiO surrounding the BaTiO nanocube. The shells of CaTiO and SrTiO comprise a layer thickness of only one unit cell of ∼0.4 nm (400 pm). Thus, we demonstrate new research on nanocube surfaces on the picometer scale.
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