Facile Synthesis of BaTiO 3 Nanocubes with the Use of Anatase TiO 2 Nanorods as a Precursor to Titanium Hydroxide

We report a solvothermal method for the facile and reproducible synthesis of BaTiO 3 nanocubes by employing anatase TiO 2 nanorods as a precursor to titanium hydroxide. The TiO 2 nanorods were, in turn, synthesized in advance through another solvothermal process. We could obtain high‐quality BaTiO 3 nanocubes by reacting the TiO 2 nanorods with Ba(NO 3 ) 2 under solvothermal conditions in the presence of oleic acid and acetic acid as dual capping agents, followed by a purification process involving chemical washing and physical filtration. The addition of acetic acid alongside oleic acid was critical to the formation of well‐defined {100} facets on the nanocrystals and also increased batch‐to‐batch reproducibility without the use of a glove box or similar air‐free experimental design. Using this method, BaTiO 3 nanocubes crystallized in the cubic phase could be readily obtained with an average edge length around 8 nm.