Surface Characteristics of Zirconia-Coated TiO2 and its Phase Transformation

Angkhana Jaroenworaluck; Weeraw Sunsaneeyametha; Ron Stevens

doi:10.4028/www.scientific.net/KEM.334-335.1101

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HomeKey Engineering MaterialsKey Engineering Materials Vols. 334-335Surface Characteristics of Zirconia-Coated TiO2...

Surface Characteristics of Zirconia-Coated TiO₂ and its Phase Transformation

Abstract:

Recently, zirconia has been considered as a suitable material for surface coating nanosized TiO2 for use as an electrode in a solar cell application. In this study, the TiO2 (P-25) coated ZrO2 was synthesized from P-25 TiO2 and coated with zirconium n-propoxide in the range of 2.5-50 wt.%. The surface of the TiO2 coated with ZrO2 were examined by X-ray diffraction (XRD) analysis, high resolution transmission electron microscope (HRTEM), which showed zirconia could coat onto the P-25 TiO2 surface. Any excess of zirconia has been deposited as separated particles. Peaks for tetragonal zirconia were observed from the XRD patterns in zirconia-coated P-25 containing more than 20 wt. % of zirconia after calcinations at 500 °C, 800 °C and 1300 °C. In addition, peaks of anatase could be observed from XRD patterns of the samples after calcination at 1300°C. The results show that coating zirconia onto the TiO2 grain surfaces may act to retard the phase transformation from anatase to rutile.