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Synthesis and layer-by-layer self-assembly of titania nanosheets controllably doped with binary transition metal ions

Here, we describe the synthesis of novel titania nanosheets controllably doped with binary transition metal ions and their layer-by-layer self-assembly. The tailored Mn and Fe doping in exfoliated Ti 0.6 Mn x /2 Fe (0.8- x )/2 O 2 ( x = 0.0–0.4) nanosheets is achieved by systematically changing the molar ratio of Mn/Fe in K 0.8 Ti 1.2 Mn x Fe 0.8- x O 4 using a codoping strategy. The protonated layered crystals exhibit a delaminated behavior in the tetrabutylammonium hydroxide solution and are exfoliated into colloidal single sheets, which are characterized by a large lateral size and a thickness in molecular dimension. The resulted nanosheets are able to be layer-by-layer deposited with oppositely charged polymers into a composite organic/inorganic system.