The anatase peaks appear at 2 = 25.50◦ (1 0 1) and
48.0◦ while those of rutile appear at 2 = 27.50◦ (1 0 1) and 54.50◦.
As shown in the figure, the well crystallized anatase and rutile forms
were observed in all the FT sheets (Fig. 3b–d) and were identical to
those of Degussa P25 powder in Fig. 3a. In addition, a broad scattering
peak at 2 = 19◦ of rubber matrix was also discernible in the
patterns of all the FT sheet samples. The intensity of this broad
peak increases with increasing concentration of rubber latex, i.e.,
the 5 wt% sheet (Fig. 3b) exhibits the lowest intensity compared
with the 10 wt% and 15 wt%, respectively. The XRD of pristine rubber
sheet has been shown in our previous work elsewhere which
shows only a large broad peak near 2 = 19◦ [26] due to the fact
that the rubber matrix is composed of low atomic number (low Z)
elements. The matrix of 5 wt% sheet has the highest content of TiO2
particles than those of the other sheets, therefore, the highest average
Z-value of matrix resulting in the lowest X-ray scattering and
the lowest intensity peak at 2 = 19◦ as shown in Fig. 3b.