Synthesis of three-dimensional hierarchical BaCrCU dendrites

摘要

3-D hierarchical superstructures of BaCrO_4 were prepared by a hydrothermal reaction of Ba(NO_3))2 and Na_2CrO_4 in an aqueous-hexane bilayer system. A surfactant mixture of oleylamine and oleic acid was used to form hydrophobic barium oleate micelles. During the hydrothermal process, aqueous CrO_4~2 anions reacted at the interface with Ba~(2+) cations in the hexane phase to form BaCrO_4 crystals. 3-D hierarchical dendritic BaCrO_4 formed with a trunk and aligned, cruciform series of branches perpendicular to it. Scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM) confirmed that both trunk and branches preferentially grew in the <001> direction. The dendrites formed through epitaxial growth.