Using HF in TiO2 synthesis (left) changes the crystals’ morphologies and facets relative to an HF-free method (right), as seen in these TEM images, and may unexpectedly alter the crystals’ catalytic properties.
Credit: ACS Catal
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http://cen.acs.org/articles/91/i21/Fluorides-Unexpected-Role-Photocatalysis.html