Another actively pursued research area is to extend the
excitation spectrum of TiO2 to include visible light. The general
strategy is doping metal impurities, dye sensitizers, narrow
band-gap semiconductors, or anions into nano-TiO2 to
form hybrid nanoparticles or nanocomposites (Fujishima
et al., 2008; Ni et al., 2007). Metals and anions create impurity
energy levels or narrow the band gap; upon visible light
excitation, dye sensitizers and narrow band-gap semiconductors
inject electrons into TiO2 to initiate the catalytic
reactions.
Another actively pursued research area is to extend theexcitation spectrum of TiO2 to include visible light. The generalstrategy is doping metal impurities, dye sensitizers, narrowband-gap semiconductors, or anions into nano-TiO2 toform hybrid nanoparticles or nanocomposites (Fujishimaet al., 2008; Ni et al., 2007). Metals and anions create impurityenergy levels or narrow the band gap; upon visible lightexcitation, dye sensitizers and narrow band-gap semiconductorsinject electrons into TiO2 to initiate the catalyticreactions.
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