Synthesis And Properties Research Of Novel Copper Micro-nano Materials

Recently, micro-nano materials attract people’s attention because of their unique physical and chemical properties, such as the optical performance, chemical properties, small size effect, quantum size effect, surface effect, macroscopic quantum tunnel effect and so on. The micro-nano copper compounds have variety of morphology and structures, such as tetrahedron, octahedron, multistage hollow spherules, which causes the compounds to have the gas-sensing properties, catalytic properties, optical properties and photovoltaic performance.Micro-nanocrystalline Cu2SO3·CuSO3·2H2O has been successfully prepared via liquid phase method in the study. Influence of water/ethanol ratios in reaction solution on crystallization and morphologies of the synthesized micro-nanocrystals was investigated by X-ray diffraction (XRD), scanning electron microscope (SEM). The results show that the size of crystals and morphology could be controlled by changing water/ethanol ratios in reaction solution. The properties of samples were evaluated by the degradation of methyl orange (MO) solution. It is found that the methyl orange solution could be completely degraded within0.5h adding a small amount of H2O2under natural light illumination, which indicates that Cu2SO3·CuSO3·2H2O has good application prospects for the degradation of the dye waste water.The mixed valence copper Cu2SO3·CuSO3·2H2O with durian-like was synthesized by a simple hydrothermal method. The effects of the reaction time, reaction solvents of water/ethanol ratios, reaction temperature and surfactants on the crystallization and morphology particles size of the synthesized micro-nanocrystals were investigated. It is found that the size of crystals and morphology could be controlled by changing reaction time, however, the performance of the degradation of methyl orange has not changed. A little bit crystallization water of the sample was lost when the hydrothermal temperature was elevated. When the temperature reaches100℃, part of Cu (Ⅱ) reverted to the Cu by hydrothermal reaction. The electrochemical performance of the salt was evaluated by cyclic voltammetry (CV) and charge-discharge test as the lithium ion battery electrode material. The electrode exhibited high initial discharge capacity but extremely low charge capacity, which illustrates that Cu2SO3·CuSO3·2H2O is not suitable for lithium ion battery electrode negative material.The different morphologies of Cu2O/TiO2nano heterojunction were synthesized via liquid phase method and electrochemical method. The structure morphology and properties of the samples were characterized by XRD, SEM, diffuse reflection ultraviolet (DRUV), transmission electron microscopy (TEM), photoelectric performance (V-I) detection. The results show that the dispersed Cu/Cu2O/TiO2heterogeneous particles were prepared by adding surfactant SDS0.007g in the reaction solution with stirring. DRUV results demonstrate that the photocatalytic performance of Cu/Cu2O/TiO2nano heterojunction is better than that of TiO2and Cu/Cu2O. The TiO2nanotube arrays (the aperture is80-110nm) were prepared by an two-step electrochemical anodization process with0.3wt.%NH4F and2wt.%H2O as electrolyte and25V voltage. TEM results show that the full diameter of TiO2nanotube arrays was evenly coated by Cu2O, DRUV and V-I indicate that the Cu2O/TiO2nanotube heterojunction photoelectric acitivity enhances substantially in the visible area.