Preparation and Microstructure of Ag-Doped Tio_2 Nanotubes by Anodization Method

摘要

In this paper, we present the effect of silver (Ag) dopants in titanium dioxide (TiO_2) nanotubes by the electrochemical anodic oxidation of pure titanium in the mixtures of ethylene glycol (EG), ammonium fluoride (NH_4F) and deionized water electrolyte solution containing with different concentrations of silver ions. X-ray diffraction (XRD) was used to study microstructure and scanning electron microscopy (SEM) and atomic force microscopy (AFM) were used to investigate surface morphology of TiO_2. The results showed that the diameters of nanotube arrays were about 92 nm for undoped TiO_2 and about 103 nm for all Ag-doped TiO_2 nanotubes. The peaks for undoped and doped TiO_2 are similar. When the concentration of silver nitrate (AgNO_3) dopants increases, the TiO_2 nanotube arrays cracked and are not well arranged.