Shape-controlled Synthesis Of ZrO₂ Modulated By Organic Templates

Nano-ZrO₂ has widespread potential applicability in the fields of inorganic materials with many unique properties.Various novel properties of ZrO₂ nanostructures stem from the chemical component,equally important,that these properties change with respect to specific structure,size and morphology.The strategy of using organic templates or modifiers with complex functionalization patterns to control the nucleation,growth,and alignment of crystals has been widely adapted for the biomimetic synthesis of a variety of inorganic materials with complex forms.This dissertation focuses on the shape-controlled synthesis of ZrO₂ modulated by organic templates,We primarily investigated the formation mechanism and optical properties of the as-prepared ZrO₂ with different morphologies.The main contents are shown as below:1.Controlled synthesis of floriated and peanut-like ZrO₂ was studied in a systems of acetone and aether,and the results showed that the acetone and aether system were very effective crystal growth modifiers to direct the growth of ZrO₂ crystals to various morphologies.2.ZrO₂ crystal with morphology of dendritic was prepared in the presence of PEG200. The results showed that PEG200 obviously influenced the formation of precipitates and the morphology of final products.PEG200 have dual roles.On the one hand,the PEG200 provided nucleation sites with Zr⁴⁺ through the role of charge matching.On the other hand, the PEG200 has played the role of steric and that avoid the hard reunion.3.spindle-shaped ZrO₂ was synthesized using saccharide compounds such as glucose, sucrose,dextrin and starch as templates.At acidic conditions,the sucrose,dextrin and starch hydrolysis to generate glucose.Therefore,the mechanism of interaction between ZrOCl₂ and sucrose,dextrin and starch similar to the interaction between ZrOCl₂ and glucose.4.Rod-like and.cube-shaped ZrO₂ were synthesized successfully by a biomimetic method with the existence of tryptophan and p-hydroxyphenylglycine by biomimetic method. In the synthesis process,the functional group of the amino acid molecular played a crucial role.Preparation of pit-shaped ZrO₂ nanoparticles using microzyme as template. 5.PL spectrum obtained from Shape-controlled ZrO₂ nanostructures.Compared with the conventional ZrO₂ material,the fluorescence intensity of nano-ZrO₂ with special morphology is far stronger than conventional materials zirconia.The emission peak of nano-ZrO₂ with different morphologies has different intensity.The PL relative intensity is apparently intensifying with increasing temperature.