Fig. 7a shows an HRTEM image of sample C2. The single crystalline
TiO2 particles with size of about 15 nm in the composite matrix
are observed. The lattice fringes space measured from the
image is about 0.35 nm, corresponding to the lattice constant of
the (1 0 1) planes of anatase. From the HRTEM image of sample
C3 in Fig. 7b, clear lattice fringes of TiO2 are observed and the spacing
of the crystallographic planes is also around 0.35 nm, corresponding
to the (101) planes of anatase crystals. The TiO2
particles in sample C4 are also single crystalline intimately attached
on the surface as shown in Fig. 7c.