TiO2 nanotubes (TNTs) were synthesized and modified using the anodization method in a glycerol
and ammonium fluoride solution, which was followed by a thermal treatment. The second anodisation
was continued by increasing anodizing voltage to deposit a film on the surface of titanium, which
resulted in a free standing membrane based on of TNTs. The nanotubes were further characterised
using X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier transform infrared
(FTIR) spectroscopy. The SEM result showed that the layer thickness of free standing membrane
based on TNTs increased with an increase in the anodizing voltage; however, at high voltages, this
layer was damaged. The XRD and FTIR results indicated the generation of TNT having an anatase
crystal phase. The results of test for photoelectrochemical properties showed that the optimal conditions
of anodizing voltage was 50 V maintained for 1 h.
Enhanced Photoelectrochemical Activity of ZnO-Coated TiO2 Nanotubes and Its Dependence on ZnO Coating Thickness
