Fig. 3 plots the X-Ray diffraction patterns of the TNO powder obtained from TNO sol annealed at 550◦C in the 2 range of 10–80◦and TiO2 powder prepared at the same way.
The peaks positions show the anatase phase of TNO and TiO2 powders that can be compared with the standard JCPDS file (JCPDS 21-1272) which refers toTiO2 anatase.