Bioinspired Color Switchable Photonic Crystal Silicone Elastomer Kirigami
Bioinspired Color Switchable Photonic Crystal Silicone Elastomer Kirigami
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DOI：
10.1002/anie.202103045
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发表时间：
2021-05-11
影响因子：
16.6
通讯作者：
Li, Mingzhu
中科院分区：
文献类型：
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作者：
Lai, Xintao;Peng, Jingsong;Li, Mingzhu
仿生动态结构色在动态显示、传感器、密码学和伪装方面具有巨大的应用潜力。然而，人工结构色装置能够承受数千次循环的情况相当罕见。雄性蜂鸟的头冠和喉部颜色鲜艳，表现出频繁的颜色切换，这是通过皮肤或关节的运动调节羽毛方向而引起的。受这种独特的结构颜色调制的启发，我们展示了一种灵活的、机械触发的颜色可切换片材，该片材基于通过激光切割制成的光子晶体（PhC）涂层的聚二甲基硅氧烷（PDMS）剪纸（PhC-PDMS kirigami）。有限元建模 (FEM) 模拟表明，PDMS kirigami 的厚度和激光切割引起的切口处的倒角均主导面内拉伸产生的面外变形。仿生 PhC-PDMS 剪纸显示出精确可编程的结构颜色，并且在回收超过 10 000 次后仍保持良好的颜色。这种仿生 PhC-PDMS 剪纸即使在明亮的阳光下也表现出出色的可视性、高可读性、强大的功能、技术灵活性和机械耐用性，很容易用于体育行业或医疗应用的彩色机械监视器、可穿戴迷彩和安全系统等应用。
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.