Shape-controlled Synthesis And Preliminary Study On Optical Properties Of ZrO₂

Various novel properties of ZrO₂ nanostructures stem from the chemical component, equally important, that these properties change with respect to specific size, morphology and superstructure. Based on the interest in peculiar shaped ZrO₂ in different applied fields, in the present work, we hope to control the nucleation and growth of inorganic crystals via a simple and mild solution-growth method. Normal low-molecular-weight micromolecular organic additives, surfactant templet and the microreaction pool, and artificial activated nucleation points have been shown to exert significant morphological influence on the crystallization of nano-ZrO₂. This work figured out and analysed the modality of the nano-zirconia and primarily discuss the shape mechanism. Furthermore, spectral analysis of the peculiar ZrO₂ has been investigated. The main contents are shown as below:1.Reviewed the progress of shape-controlled nanomaterials, emphasised on three types of special modality zirconia synthetical methods and analysised their characteristics;2.Nanorod and Nanocluster ZrO₂ were synthesized in the present investigation via competition of complexation and deposition of zirconyl chloride, sodium hydroxide and micromolecule templates in an alcohol solution. The nano-structural ZrO₂ have tetragonal or cubic nucleation initiatory phases respectively. With the increasing calcination temperature, the shapes of ZrO₂ were unaffected, while ultimate transformation to monoclinic phase is observed ;3.A quaternary"water-in-oil"microemulsion of hexamethylene alkyl as oil, pentanol as the assurfactant, various types of surfactant, and the inexpensive ZrOCl2·8H2O as zirconium fountain, sodium bicarbonate as the precipitator was used to prepare the tube, blossom, cypress, ribbon-like nano-Zirconia. The abnormal orthorhombic phase ZrO₂ can be detected. It might be attributed to the nano-size of original particles;4.On the basis of w/o microemulsion and gravity self-assembly technology, ordered-structures nano-ZrO₂ with block, ball or interim shapes are deposited on glass base. The glase substrate via three processing took on special surface characters, which provided different nuclear activity points. Thus nano-ZrO₂ ordered-structures with diversified shapes self-assembled;5.PL spectrum obtained from Shape-controlled ZrO₂ nanostructures. The emission peaks exhibit a maximum at 468nm, a shoulder about 484nm, when the sample was excited with light of 425nm wavelengths, insufficient to the valence band to conduction band transition. The disparate morphogenesis of ZrO₂, which lead to unusual optical properties such as broad, excessive or shifted peaks, can be attributed to extraordinary defect states.