Anatase TiO₂ Nanoparticles on Rutile TiO₂ Nanorods:  A Heterogeneous Nanostructure via Layer-by-Layer Assembly

Abstract

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

TiO2Nanorods Preparation from Titanyl Sulphate Produced by Dissolution of Ilmenite

“…Rutile TiO 2 type on a peak of 27.49º has higher intensity than anatase TiO 2 type at 25.28º. This is a specific character of nanorods TiO 2 morphology, like the analysis result reported by Liu et al [15].…”

NO Catalytic Oxidation Behaviors over CoOx/TiO2 Catalysts Synthesized by Sol–Gel Method

“…The surface of these particles was not clear, and crystal cobalt oxides could not be investigated. The lattice spacing of anatase101 crystal plane was 0.3375 nm, which is slightly less than that of the reported data of anatase TiO 2 [29]. It is indicated that the cobalt oxides might be doped in the TiO 2 lattice and well dispersed in TiO 2 crystal, which reduced the crystallinity of TiO 2 .…”

Probing the charge recombination in rGO decorated mixed phase (anatase-rutile) TiO2 multi-leg nanotubes

“…11 On the other hand, it has also been shown that mixed phase (anatase-rutile) is more effective in improving PEC performance compared to single phase of TiO 2 having either anatase or rutile component. [14][15][16] This has been attributed to the ability of mixed phase junction (anatase/rutile) in suppressing charge carrier recombination rates by prolonging life time of electron-hole pair due to charge transfer from one phase to the other, thus increases the charge separation rate. 16,17 However, there is no general conclusion obtained in the direction of charge transfer from one phase to the other.…”