Fig. (3)
SEM images of
a
) undoped TiO
2
denoted as TiZr_0, Zr
4+
doped TiO2 sample denoted as
b
) TiZr_1,
c
) TiZr_2,
d
) TiZr_3,
e
) TiZr_4,
f
) TiZr_5,
g
) TiZr_6.