Abstract

Titanium dioxide (TiO₂) has been widely used in advanced oxidative processes as a photocatalyst. However, due to the large band gap (3.0 ~ 3.2 eV), TiO₂ can only absorb UV light and shows limited photoresponse range. To improve this drawback, doping Ag is one of the promising methods to modify TiO₂ because its nanostructure shows strong localized surface plasmon resonance (LSPR) in the visible light range and extends the absorption spectrum of pure TiO₂ [1]. By changing the size and morphology of Ag nanoparticle, the plasmon resonance properties of Ag can be controlled. Moreover, compared with the well-discussed Ag nanosphere, Ag nanoprism has a longer plasmon resonance wavelength and could be a better co-catalyst. In this study, two plasmonic Ag nanostructures/P25 (commercial TiO₂) hybrid systems were synthesized and compared.

© 2016 Japan Society of Applied Physics, Optical Society of America