Formation and Morphology of Zn₂Ti₃O₈ Powders Using Hydrothermal Process without Dispersant Agent or Mineralizer

摘要

Synthesis of Zn₂Ti₃O₈ powders for attenuating UVA using TiCl₄, Zn(NO₃)₂·6H₂O and NH₄OH as precursor materials by hydrothermal process has been investigated. The X-ray diffractometry (XRD) results show the phases of ZnO, anatase TiO₂ and Zn₂Ti₃O₈ coexisted when the zinc titanate powders were calcined at 600 °C for 1 h. When calcined at 900 °C for 1 h, the XRD results reveal the existence of ZnO, Zn₂TiO₄, rutile TiO₂ and ZnTiO₃. Scanning electron microscope (SEM) observations show extensive large agglomeration in the samples. Transmission electron microscope (TEM) and electron diffraction (ED) examination results indicate that ZnTiO₃ crystallites formed with a size of about 5 nm on the matrix of plate-like ZnO when calcined at 700 °C for 1 h. The calcination samples have acceptable absorbance at a wavelength of 400 nm, indicating that the zinc titanate precursor powders calcined at 700 °C for 1 h can be used as an UVA-attenuating agent.