Photocatalytic Self‐Doped SnO2−x Nanocrystals Drive Visible‐Light‐Responsive Color Switching. (5th June 2017)

• Record Type: Journal Article
• Authors: Han, Dan; Jiang, Baolai; Feng, Ji; Yin, Yadong; Wang, Wenshou
• Is Part Of: Angewandte Chemie. Volume 129:Number 27(2017)
• Page Start: 7900
• Page End: 7904
• Publication Date: 2017-06-05
• Subjects: Farbwechsel -- Mehrfach beschreibbare Medien -- Nanokristalldotierung -- Sichtbares Licht -- Zinnoxid; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.201702563
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: Visible‐light‐responsive reversible color‐switching systems are attractive to many applications because visible light has superior penetration and causes far less damage to organic molecules than UV. Herein, we report that self‐doping of SnO2− x nanocrystals with Sn 2+ red‐shifts their absorption to the visible region and simultaneously produces oxygen vacancies, which can effectively scavenge photogenerated holes and thus enable the 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 on using a visible laser pen or projection printing through a photomask. This discovery represents a big step forward towards practical applications, especially in areas in which safety issues and photodamage by UV light are of concern.