Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 54, Issue 4, Pages 1321-1326Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201410408
Keywords
doping; nanocrystals; oxygen vacancies; photocatalysis; titania
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Funding
- U.S. Department of Energy [DE-FG02-09ER16096]
- U.S. National Science Foundation under Major Research Instrumentation Program [DMR-0958796]
- Office of Science, Office of Basic Energy Sciences of the U.S. Department of Energy [DE-AC02-05CH11231]
- National Basic Research Program of China [2013CB834605]
- National Natural Science Foundation of China [U1232102]
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Colloidal barium-doped TiO2 nanocrystals have been developed that enable the highly reversible light-responsive color switching of redox dyes with excellent cycling performance and high switching rates. Oxygen vacancies resulting from the Ba doping serve as effective sacrificial electron donors (SEDs) to scavenge the holes photogenerated in TiO2 nanocrystals under UV irradiation and subsequently promote the reduction of methylene blue to its colorless leuco form. Effective color switching can therefore be realized without relying on external SEDs, thus greatly increasing the number of switching cycles. Badoping can also accelerate the recoloration under visible-light irradiation by shifting the absorption edge of TiO2 nanocrystals to a shorter wavelength. Such a system can be further casted into a solid film to produce a rewritable paper on which letters and patters can be repeatedly printed using UV light and then erased by heating; this process can be repeated for many cycles and does not require additional inks.
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