National Engineering Research Center for Colloidal Materials, School of Chemistry and Chemical Engineering, Shandong University, Ji'Nan, 250100, P.R. China.
Department of Chemistry and UCR Center for Catalysis, University of California, Riverside, CA, 92521, USA.
Angew Chem Int Ed Engl. 2017 Jun 26;56(27):7792-7796. doi: 10.1002/anie.201702563. Epub 2017 Jun 5.
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 SnO nanocrystals with Sn 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 SnO 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.
可见光是一种吸引人的应用，因为可见光具有更好的穿透性，对有机分子的损伤也远小于紫外线。在此，我们报告了 SnO 纳米晶体的自掺杂，它将吸收红移到可见光区域，并同时产生氧空位，这可以有效地清除光生空穴，从而使氧化还原染料的颜色切换能够使用可见光进行。通过将 SnO NCs 的光催化活性与不同氧化还原染料的颜色切换动力学相结合，也可以实现波长选择性切换。快速的光响应使我们能够进一步制造出一种固体薄膜，该薄膜可以使用可见激光笔或通过光掩模进行投影打印来反复写入。这一发现朝着实际应用迈出了一大步，特别是在涉及到安全问题和紫外线光损伤的领域。
