Surfactant-free microwave-assisted hydrothermal synthesis of BaMoO4 hierarchical self-assemblies and enhanced photoluminescence properties.

BaMoO(4) with 3D hierarchical multilayer disk-like and nest-like architectures self-assembled from 2D nanosheets was successfully synthesized via a microwave-assisted hydrothermal route without any surfactant. The as-prepared products were characterized by X-ray powder diffractometer (XRD), scanning electron microscope (SEM), field emission transmission electron microscope (FE-TEM), and photoluminescence (PL) spectrometer. The results show that the reaction parameters, including pH value, reactant concentration, and molar ratio of [Ba(2+)]/[MoO(4)(2-)], played important roles on the morphologies of the final products.

Preparation of Eu(3+) doped (Y,Gd)(2)O(3) flowers from (Y,Gd)(2)(CO(3))(3).nH(2)O flowerlike precursors: Microwave hydrothermal synthesis, growth mechanism and luminescence property.

In this study, (Y,Gd)(2)O(3) and (Y,Gd)(2)O(3):Eu flowerlike microstructures were prepared through two steps: well-organized 3-dimensional (3D) flowerlike precursors were first synthesized by a facile urea-based microwave hydrothermal method, then followed by heat treatment. The morphology of the 3D flowerlike precursors could be modulated by adjusting the synthetic conditions including concentration of the starting material, reaction time and temperature. Higher the concentration of Y/Gd ions or reaction temperature, earlier the 3D flowerlike precursors were obtained.