Study On The Synthesis And Properties Of ZnO Nanosheets With Hierarchical Porous Structure

ZnO is an attractive semiconductor material with wide direct band gap (3.37 eV at room temperature), large exciton binding energy (60 meV). The properties of ZnO are not only related to its chemical constitution, but also its size, form and dispersibility.Generally speaking, compared with general materials, porous materials possess a series of advantages such as high specific surface area, high specific strength, low relative density, light weight, good permeability and good thermal insulation. Sheet-like morphology makes this material easier to use, they have high crystalline. Also, it can avoid the reaction only taking place on the surface of the material. In addition, the permeability of the materials will be changed, the molecules of the reactant not only can interaction the surface of the material, but also inside the material to increase the reaction speed by increasing the reactivity. The research on the superior performance and the special structure of the porous materials and the control of the size and the structure of the porous materials will performance a practical application significance and research value.Herein, we develop a synthetic routine to prepare ZnO nanosheets. First, synthesize Zn(OH)2 nanoparticles by micromulsion method and synthesize Zn(OH)2/PAM composite structure by UV-light induced method with the synergistic effect of Zn(OH)2 nanoparticles and photosensitive organic monomer, then remove organic components by calcinations, well-crystallize ZnO nanosheets with hierarchical porous structure can be obtained. The characterization results show that the as-prepared sheet-like structure is comprised of ZnO nanoparticles with uniform grain size with high specific surface area and abundant mesoporous channel structure. Then, the formation mechanism of the ZnO nanosheets with hierarchical porous structure is discussed and analyzed. After changing several parameters, we find that the size of the ZnO nanosheets with hierarchical porous can be effective controlled. At last, the powder material is used in the anode for the lithium-ion battery, the charge/discharge characteristics and cycling performance are testing and analyzed.In this paper, the method of synthesizing ZnO nanosheets with hierarchical porous structure is simple, convenient, efficient, well-repeatable, low cost, non-pollution, easy-controlled. The product has both the characters of nanoparticles and porous material, the chemical stability stands out at normal temperature, it can be applied in gas sensitive material and photocatalysis.