| Abstract
| - We report here the use of a layer-by-layer assembly technique to prepare novel TiO2 heterogeneous nanostructuresin which anatase nanoparticles are assembled on rutile nanorods. The preparation includes assembling anatase nanoparticlemultilayers on rutile nanorods via electrostatic deposition using poly(sodium 4-styrene sulfonate) as a bridging oradhesion layer, followed by burning off the polymeric material via calcination. The composition of the heterogeneousnanostructures (i.e., the anatase-to-rutile ratio) can be tuned conveniently by controlling the experimental conditionsof the layer-by-layer assembly. It was found that, with the optimum preparation conditions, the heterogeneousnanostructures showed better photocatalytic activity for decomposing gaseous acetaldehyde than either the originalanatase nanoparticles or the rutile nanorods. This is discussed on the basis of the synergistic effect of the existenceof both rutile and anatase in the heterogeneous nanostructure.
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