effect of inverse opal structure, thus coupling the physical and chemical enhancement for the light absorption. The photocatalytic efficiency was evaluated by the
photodegradation of AO7, and it is proved that the cooperation of slow light effect
and Ti
3+ doping is an effective way to improve visible light-driven photocatalytic
performance of TiO 2 photocatalyst (Scheme 9.3).
To achieve the coupling between the slow photon effect and plasmon resonance
absorption, three-dimensional ordered assembly of TiO 2 hollow nanospheres deposited with Au nanoparticles (Au/TiO 2 –3DHNSs) was designed (Fig. 9.14) [19]. A
Fig. 9.12 SEM images of WO 3 inverse opals: (a) WO 3 -200, (b) WO 3 -260, and (c) WO 3 -360. (d)
Photograph of the inverse opal WO 3 photoanodes under white light illumination, WO 3 -200, WO 3 -
260, and WO 3 -360, from left to right. (e–g) SEM images of cross-sectional view of each inverse
opal. The thickness is estimated to be about 2.5 μm (17 layers) for WO 3 -200 (e), 2.6 μm (14 layers)
for WO 3 -260 (f), and 2.7 μm (11 layers) for WO 3 -360 (g) (Reprinted with the permission from ref.
[17]. Copyright 2011 American Chemical Society)
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9 Hollow or Yolk–Shell-Type Photocatalyst