Preparation and characterizations of Na_2Ti_3O_7, H_2Ti_3O_7 and TiO_2 Nanobelts

摘要

In this paper, the Ti-O-Compound nanobelts from commercial TiO_2 (annatase phase) were synthesized via the alkali-hydrothermal process. The as-synthesized nanobelts are sodium iitanate. hydrogen titanate and anatase with general formula Na_2Ti_3O_7, H_2Ti_3O_7 and TiO_2, respectively. The nanobelts are characterized by Thermogravimetric/Differential Thermal Analysis (TG/DTA), X-ray Diffraction (XRD), Infrared Spectra (IR) and Scanning Electron Microscope (SEM) apparatuses. The characterization indicates that the nanobelts with typical widths of 50 to 200 nm, thicknesses of 20 to 50 nm, and up to a few millimeters in length. The conversion mecnanisms between the layer titanate and anatase of nanobelts have been discussed in this study.