Morphological Characterization of Shape-Controlled TiO2 Anatase through XRPD Analysis
-
Mauro Coduri
,
Michela Maisano
Abstract
Preferential growth of anatase crystallites along different directions is known to deeply affect their photocatalytic properties, especially with respect to the exposure of the reactive {001} facets. Its extent can be easily quantified through simple geometric calculations, on the basis of crystal sizes extracted for specific directions by means of X-Ray Diffraction data analysis. Nevertheless, the actual results depend on the method employed for such a quantification. Here we report on a comparative morphological investigation, performed by employing the Scherrer equation and the line profile from Rietveld refinements, on shape-controlled anatase photocatalysts produced by employing HF as capping agent. Compared to the Rietveld-based method, the use of the Scherrer equation produces a systematic underestimation of crystallite dimensions, especially concerning the [100] direction, which in turn causes the percentage of exposed {001} crystal facets to be underestimated. Neglecting instrumental-related effects may further reduce the estimate.
Acknowledgement
Financial support from the Cariplo Foundation through the 2013-0615 grant to the project “Novel Photocatalytic Materials Based on Heterojunctions for Solar Energy Conversion” is gratefully acknowledged.
©2016 Walter de Gruyter Berlin/Boston
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- Frontmatter
- Editorial
- The First European Conference on Physical and Theoretical Chemistry
- Inverse Calibration Free fs-LIBS of Copper-Based Alloys
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