3D‐Printed Hydrogel‐Based Flexible Electrochromic Device for Wearable Displays

• DOI: 10.1002/advs.202404679
• Publication Date: 2024-08-09T13:43:06Z
• Authors: Xiaoyu Luo; Rongtai Wan; Zhaoxian Zhang; Manting Song; Lixia Yan; Jingkun Xu; Hanjun Yang; Baoyang Lu
• Keywords: Wearable Technology; 3d printed; Camouflage; Flexible Electronics; Viologen

Flexible electrochromic devices (FECDs) are widely explored for diverse applications including wearable electronics, camouflage, and smart windows. However, the manufacturing process of patterned FECDs remains complex, costly, non-customizable. To address this challenge, a strategy is proposed to prepare integrated via multi-material direct writing 3D printing. By designing novel viologen/polyvinyl alcohol (PVA) hydrogel inks systematically evaluating printability various inks, seamless interface integration can be achieved, enabling streamlined with continuous production capabilities. The resultant 3D-printed exhibit excellent mechanical properties, high optical contrast (up 54% at 360 nm), nice cycling stability (less than 5% electroactivity reduction after 10 000 s), 19% optimal decrease 5000 cycles bending). potential these hydrogel-based further demonstrated in