Synthesis and Characterization of Nanosized Anatase TiO2 Cuboids

Abstract

Abstract: Anatase TiO₂ nanocrystals with cuboidal morphology were successfully prepared in the absence of any templates or shape-protectors by changing Ti(OH)₄ precipitate(hydrogel) into its corresponding ethanol-gels(viz., by extensive washing with absolute ethanol), followed by supercritical drying in ethanol medium and then calcination in air(named as AS preparation). The cuboidal crystals were subject to calcination at different temperatures and were characterized by N₂ physisorption, XRD, Raman spectroscopy, and TEM/HRTEM. The change of the calcination temperature in the range from 270 to 650 ℃ showed little effect on the surface area, pore volume and crystal/particle sizes of the sample. A further increase of the calcination temperature up to 800 ℃ resulted in a significant sintering of the TiO₂ nanocrystals but the sample crystal phase remained in the anatase structure. These results suggest that the as-prepared anatase TiO₂ cuboids are highly resistant to the well-known thermal effect on the phase transformation(anatase-to-rutile) of titania. However, the calcination of the sample at 1 000 ℃ resulted in a complete anatase-to-rutile phase transformation, which was companied by severe sintering growth of the TiO₂ crystals as well as a drastic change in the sample texture.

Key words: Anatase TiO₂, Cuboidal nanocrystals, Shape-controlled synthesis, Alcogel, Supercritical drying

CLC Number:

O643

TrendMD:

WANG Hai, WU Yu, XU Bo-Qing. Synthesis and Characterization of Nanosized Anatase TiO₂ Cuboids[J]. Chem. J. Chinese Universities, 2005, 26(4): 607.

References

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Synthesis and Characterization of Nanosized Anatase TiO₂ Cuboids

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