Hydrothermal Synthesis And Properties Of Ternary Metal Oxide Nanomaterials

In recent years, the ternary metal oxide nanomaterials have attracted extensive attention due to their unique properties and potential applications. So far, various methods have been applied to fabricate ternary metal oxide nanomaterials. Because of the extensive adaptability, high yield and low wasting, hydrothermal method has been welcomed by scientists. Therefore, our study were focused on the synthesis of CuGeO3nanorods and Zn3(OH)2V2O7·2H2O hexagonal nanoplates based on hydrothermal method. We also studied the composition, morphology, formation mechanism and properties of the nanostructures. The main results are listed as below:1. Single crystalline CuGeO3nanorods with a diameter of20-35nm and a length up to1μm have been prepared via a facile hydrothermal route, employing GeO2and Cu(CH3COO)2-H2O as starting materials, ethylenediamine (En) as coordination and structure-directing reagent. Some influencing factors such as the reaction time, reaction temperature, the volume of En were revealed to play crucial roles in the formation of the CuGeO3nanorods. A possible growth mechanism was proposed based on the experimental results. Significantly, this is the first time that CuGeO3was used as a photocatalyst for organic pollutant degradation under UV light irradiation. The reaction constant (κ) of CuGeO3nanorods was five times that of the sample prepared by solid-state reaction under UV light irradiation. Additionally, the optical and magnetic properties of CuGeO3nanorods were systematically studied.2. Hexagonal Zn3(OH)2V2O7·2H2O nanoplates have been successfully synthesized via a facile and template-free hydrothermal method. The nanocrystals have a hexagonal shape with650-750nm in diameter and120-140nm in thickness. The possible mechanism of forming such hexagonal Zn3(OH)2V2O7·2H2O nanoplates may be due to its inherent anisotropic crystal structure. Magnetic hysteresis measurement indicates that the as-synthesized hexagonal Zn3(OH)2V2O7·2H2O nanoplates have weak ferromagnetic properties at room temperature. Significantly, the as-prepared hexagonal Zn3(OH)2V2O7·2H2O nanoplates exhibit greatly enhanced activity in the UV-light photocatalytic degradation of methylene blue. The magnetic study indicates that the hexagonal Zn3(OH)2V2O7·2H2O nanoplates are ferromagnetic at low temperature.