Photocatalytic Self‐Doped SnO 2− x Nanocrystals Drive Visible‐Light‐Responsive Color Switching
| Autor: | Dan Han, Wenshou Wang, Ji Feng, Yadong Yin, Baolai Jiang |
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| Rok vydání: | 2017 |
| Předmět: |
Fabrication
Materials science 010405 organic chemistry Doping Nanotechnology General Medicine 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Catalysis 0104 chemical sciences Organic molecules Wavelength selective switching Nanocrystal Photocatalysis Photomask 0210 nano-technology Visible spectrum |
| Zdroj: | Angewandte Chemie International Edition. 56:7792-7796 |
| ISSN: | 1521-3773 1433-7851 |
| DOI: | 10.1002/anie.201702563 |
| Popis: | Visible light-responsive reversible color switching systems are attractive to many applications since visible light has superior penetration and causes far less damages to organic molecules than UV. Here we report that self-doping of Sn2+ in SnO2-x nanocrystals red shifts their absorption to visible region and simultaneously produces oxygen vacancies, which can effectively scavenge photogenerated holes and thus enable color switching of redox dyes using visible light. Wavelength selective switching can also be achieved by coupling the photocatalytic activity of the SnO2-x NCs with the color switching kinetics of different redox dyes. The fast light response enables the further fabrication of a solid film that can be repeatedly written freehand using a visible laser pen or projection printing through a photomask. This discovery represents a big step forward towards practical applications, especially in areas with concerns on the safety and photodamage issues of UV light. |
| Databáze: | OpenAIRE |
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