915461.fig.002a
(a)
915461.fig.002b
(b)
915461.fig.002c
(c)
915461.fig.002d
(d)
Figure 2: AFM images of the various TiO2 nanoparticle films (6 μm thick): (a) T20, (b) T37, (c) D20, and (d) RSP.