Synthesis And Characterization Of One Dimensional Sodium Titanate And Relative Titanates Nanostructures

Functional materials of nanostructures have been the foreland investigation of mateial field in the 21st century. Especially, one dimensional (ID) structures have attracted more and more attention of the researchers for its anisotropism.The physical and chemical properties of the ID structures have consanguineous relation with its morphologies. It is the ideal system to study the relaticity between physical properties and size limit, such as electrons transmission and optic properties. It is the basic cell to bulid the minisize apparatus. The successful assembly and measure of the physical properties of ID structures provide the possibility of the nano-apparatus preparation.Recently, titanate has become a focus of the researches because of its layered structures. There are more and more reports about preparetion of ID titanate. However, the results from different researchers are distinct, which excitated more interests of scientists.In this paper, we synthesized sodium titanates and other titanate nanostructures using hydrothermal method. The obtained products were investigated by field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), and X-ray diffractometer (XRD). The main contents of our work are as follows:1. Hydrothermal synthesis of sodium titanate nanobeltsSodium titanate nanobelts, with 50-80 nm and 200-300 nm in thickness and width respectively have been successfully synthesized by hydrothermal method. The obtained products were comprised of three elements, Na, Ti, O and they were characterized as sodium titanates. We also studied the formation mechanism of the titanate nanobelts.2. The preparation of the barium titanates nanostucturesBarium titanates nanostuctures were obtained by using the sodium titanate nanobelts as precursor and BaCl₂/Ba(OH)₂ as barium sources. BaTi₂O₅ nanobelts, with 60-100 nm and 200-300 nm in thickness and width respectively, were obtained with BaCl₂ as barium sources. When Ba(OH)₂ were used, the products are particles and nanorods with diameters about 200-300 nm.3. The synthesis and characterization of Bi₄Ti₃O₁₂ nanostructuresSquare nanoplates of Bi₄Ti₃O₁₂ were successfully synthesized by hydrothermal method using Bi and TiO₂ as precursor. The width and thickness of the nanoplates were about 100-400 nm and 30 nm. We also investigated the formation mechanism of the nanoplates and the infection of the experimental parameters by varying the reaction times and pH values. The results showed that NaOH plays an important role in the experiment. The addition of NaOH is propitious to the dispersion of the nanostructures.