915461.fig.003a
(a)
915461.fig.003b
(b)
915461.fig.003c
(c)
915461.fig.003d
(d)
Figure 3: The total transmittance ( ) and the direct transmittance ( ) spectra of the various TiO2 nanoparticle films (6 μm thick): (a) T20, (b) T37, (c) D20, and (d) RSP.