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Nanoscale. 2013 Oct 7;5(19):9391-6. doi: 10.1039/c3nr02273k. Epub 2013 Aug 19.

The pure shape effect with a removing facet effect of single-crystalline anatase TiO₂ (101) for photocatalytic application.

Author information

  • 1College of Chemistry and Molecular Science, Wuhan University, China. irlab@whu.edu.cn.

Abstract

3D TiO₂ nanobipyramids (TiO₂-NPs) and 1D TiO₂ nanobelts (TiO₂-NBs) were synthesized from potassium titanate K₂Ti₆O₁₃ and characterized by X-ray diffraction (XRD) patterns, field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED) patterns and fast Fourier transform (FFT). The as-synthesized 3D TiO₂ nanobipyramids and 1D TiO₂ nanobelts all show high {101} facet exposed percentages and were used to investigate the shape effect of TiO₂ with the same facet exposure. 3D TiO₂ nanobipyramids (101) showed higher photocatalytic activity than 1D TiO₂ nanobelts (101). The reasons were discussed using ROS (reactive oxygen species) production, time-resolved photoluminescence spectra, XPS (X-ray photoelectron spectroscopy) spectra and ATR-IR (attenuated total reflectance infrared spectroscopy) spectra. The postulated mechanism suggests that 3D TiO₂ nanobipyramids have more step edges which results in more -OH/H₂O molecule adsorption and longer life times of photoinduced carriers than 1D TiO₂ nanobelts.

PMID:
23959467
[PubMed]
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