Shape-controlled synthesis of monodispersed nano-/micro- NaY(MoO4)2 (doped with Eu3+) without capping agents via a hydrothermal process

Abstract

Nearly monodisperse NaY(MoO₄)₂ architectures with various shapes have been selectively prepared on a large scale by a capping agent free hydrothermal process using Y(OH)₃ nanorods as a precursor. The molar ratio of Na₂MoO₄/Y(OH)₃, the volume ratio of water/ethanol in the mixed solvents and temperature have comprehensive and crucial influences on the formation of multi morphologies of NaY(MoO₄)₂. The formation of multi morphologies is explained mainly from the viewpoint of the effective concentration of MoO₄²⁻ ions. At high temperature, high Na₂MoO₄/Y(OH)₃ ratio and high water/ethanol volume ratio, the effective concentration and reactivity of reactants, especially MoO₄²⁻ ions, are improved, which is beneficial to the growth of 3D NaY(MoO₄)₂ architectures. Under UV excitation, without further annealing treatment, NaY(MoO₄)₂:0.05Eu³⁺ bipyramid micro samples show strong red emission, corresponding to the characteristic lines of Eu³⁺.