Key Laboratory of Green Printing, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100191, China.
School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China.
Angew Chem Int Ed Engl. 2021 Jun 21;60(26):14307-14312. doi: 10.1002/anie.202103045. Epub 2021 May 11.
Bioinspired dynamic structural color has great potential for use in dynamic displays, sensors, cryptography, and camouflage. However, it is quite rare for artificial structural color devices to withstand thousands of cycles. Male hummingbird's crowns and gorgets are brightly colored, demonstrating frequent color switching that is induced by regulating the orientation of the feathers through movement of skin or joints. Inspired by this unique structural color modulation, we demonstrate a flexible, mechanically triggered color switchable sheet based on a photonic crystal (PhC)-coated polydimethylsiloxane (PDMS) kirigami (PhC-PDMS kirigami) made by laser cutting. Finite element modeling (FEM) simulation reveals that the thickness of PDMS kirigami and the chamfer at the incision induced by laser cutting both dominate the out-of-plane deformation through in-plane stretching. The bioinspired PhC-PDMS kirigami shows precisely programmable structural color and keeps the color very well after recycling over 10 000 times. This bioinspired PhC-PDMS kirigami also shows excellent viewability even in bright sunlight, high readability, robust functionality, technical flexibility, and mechanical durability, which are readily exploitable for applications, such as chromic mechanical monitors for the sports industry or for medical applications, wearable camouflage, and security systems.
受生物启发的动态结构色在动态显示、传感器、加密和伪装等领域具有很大的应用潜力。然而，人工结构色器件能够承受数千次循环的情况却相当罕见。雄性蜂鸟的冠和项圈颜色鲜艳，通过移动皮肤或关节来调节羽毛的方向，从而实现频繁的颜色切换。受这种独特的结构色调制启发，我们展示了一种基于光子晶体（PhC）涂层聚二甲基硅氧烷（PDMS）折纸（PhC-PDMS 折纸）的灵活、机械触发的可变色开关，该折纸是通过激光切割制成的。有限元建模（FEM）模拟表明，PDMS 折纸的厚度和激光切割引起的倒角都通过面内拉伸主导了面外变形。受生物启发的 PhC-PDMS 折纸可以精确地实现可编程结构色，并且在经过 10000 多次循环后仍能保持良好的颜色。这种受生物启发的 PhC-PDMS 折纸即使在阳光直射下也具有出色的可视性、高可读性、稳健的功能、技术灵活性和机械耐久性，非常适用于运动行业的变色机械监测器或医疗应用、可穿戴伪装和安全系统等应用。
