915461.fig.001a
(a)
915461.fig.001b
(b)
915461.fig.001c
(c)
915461.fig.001d
(d)
Figure 1: SEM images of the various TiO2 nanoparticle films (6 μm thick): (a) T20, (b) T37, (c) D20, and (d) RSP.