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Ultraviolet light has many uses, including water disinfection, pest control, and detection of counterfeit money. A new study by Andrés Santander-Syro at the University of Paris-Sud in France, Patrick Le Fèvre at Synchrotron SOLEIL, and their colleagues now adds another possibility.
The authors report that strong doses of UV light can create patches of nearly-two-dimensional conducting states at the surface of the anatase crystal form of titanium dioxide—a naturally occurring transparent insulator that has a wide range of applications, from paint to sunscreen to dye-sensitized solar cells. The findings demonstrate that UV light can be used to tailor the electronic character of anatase surfaces. Read the synospis on the Physics website.
Tobias Rödel/CSNSM & SOLEIL