Figure 4

Colour of DPP07, 13, 14, 15 and 17 (from left to right).
(a) DPP dyes are dissolved in THF solution (0.025 mM) and (b) DPP dyes are adsorbed on 3 μm thick TiO2 film.
Colour of DPP07, 13, 14, 15 and 17 (from left to right).
(a) DPP dyes are dissolved in THF solution (0.025 mM) and (b) DPP dyes are adsorbed on 3 μm thick TiO2 film.