Xiaoxia Yan

Iodine doped anatase TiO2 photocatalyst with ultra-long visible light response: correlation between geometric/electronic structures and mechanisms

We report that surface iodine doped TiO2 with coexisting atomic configurations of iodine dopant, I–O–I and I–O–Ti structures, exhibits an extended absorption edge up to 800 nm. Furthermore, photocatalytic activity investigations confirm the efficient generation of important oxidative species ˙OH radicals in photocatalysis oxidation processes beyond 600 nm. It is theoretically found that iodine atoms prefer to be doped within the surface due to the strong I–O repulsion. I-doping in the surface led to little change in its intrinsic bandgap, but the distribution and occupation of localized states of iodine strongly depend on the surface iodine configurations. The latter is responsible for the wider range visible light response exhibited in anatase TiO2 with the coexistence of I–O–I and I–O–Ti structures. The coexistence of I–O–I and I–O–Ti structures can distinctly change the surface structure due to the release of local strain energies.

Nitrogen-doped titania nanosheets towards visible light response.

Nitrogen-doped titania nanosheets with visible light response were synthesized by exfoliating a layered titanate with homogeneous nitrogen doping.

Lattice Distortion Oriented Angular Self-Assembly of Monolayer Titania Sheets

Self-assembly of exfoliated monolayer titania sheets is investigated by detailed transmission electron microscopy and the force field calculations. It is demonstrated for the first time that slight but significant lattice distortions result in modified angular self-assembly of exfoliated monolayer Ti(0.87)O(2) sheets. These findings significantly broaden current knowledge of the self-assembly of exfoliated nanoscale layered sheets, which may render the potential manipulation of self-assembly of nanosheets.

Antiphotocorrosive photocatalysts containing CdS nanoparticles and exfoliated TiO2 nanosheets

Australian Research Council [DP0666345, DP0773490]; China Ministry of Science and Technology (MOST) International Sci & Tech Cooperation and Exchange [2008DFA51230]; National Key Basic Science Research Program [2007CB936603]