Electrospun Photochromic Hybrid Membranes for Flexible Rewritable Media
Jing Wei, Xiuling Jiao, Ting Wang, and Dairong Chen
Keywords: photochromic; rewritable; electrospinning; tungsten oxide; hybrid membranes
ABSTRACT: Ink-free rewritable media has attracted great attention as a potential alternative to current paper prints, owingto its benefits to reducing paper production and consumption for environmental protection. It is desirable to developrewritable media based on cheap, robust and fast-response photochromic systems. Herein, we report the design and fabricationof flexible and photo-rewritable PVP/a-WO3 hybrid membranes through electrospinning, on which images withhigh resolution can be photo-printed and heat-erased for over 40 cycles. The well conjugated organic-inorganic hybridstructure endows a fast "electron-proton double injection" from PVP to a-WO3 in the coloration process and greatly improvesthe photochromic responses. The coloration times can be as short as tens of seconds and the erasure times can beas long as 10 days in ambient conditions. As-formed photochromic membranes are low-cost, environmental benign andeasy for large-scale production, indicate their great potential as flexible rewritable media for practical usage.