Oleic acid assisted glycothermal synthesis of cuboidal Ba0.6Sr0.4TiO3 nanocrystals and their ordered architectures via self-assembly

► Through a glycothermal process with oleic acid as surfactant, the size-controllable and highly monodispersed cuboidal BST nanocrystals can be synthesized. ► The selective adsorption of OA on the facets with lower plane indices directed BST to grow into uniform cuboidal nanocrystals. ► The uniform cuboidal BST nanocrystals create a chance for the ferroelectric oxide nanocrystals to self-assemble into nanoscale electronic devices.