Zhang Xuan, Yang Yanzhao, Xue Pan, Valenzuela Cristian, Chen Yuanhao, Yang Xiao, Wang Ling, Feng Wei
School of Materials Science and Engineering, Tianjin University, Tianjin, 300350, P. R. China.
Tianjin Key Laboratory of Composite and Functional Materials, Tianjin, 300350, P. R. China.
Angew Chem Int Ed Engl. 2022 Oct 17;61(42):e202211030. doi: 10.1002/anie.202211030. Epub 2022 Sep 15.
Developing bioinspired camouflage materials that can adaptively change color in the visible and infrared (IR) regions is an intriguing but challenging task. Herein, we report an emerging strategy for fabricating dynamic visible and IR camouflage materials by the controlled in situ growth of novel photopolymerizable blue phase liquid crystals with cubic nanoarchitectures onto highly aligned MXene nanostructured thin films. The resulting MXene-integrated 3D soft photonic crystals exhibit vivid structural colors and reversible switching between a bright colored state and a dark black state under a low DC electric field. As an illustration, proof-of-concept pixelated devices that allow for pixel-controllable electrochromism are demonstrated. Furthermore, a free-standing electrochromic flexible film of such 3D soft photonic crystals is fabricated, where visible electrochromism and thermal camouflage are enabled by leveraging the superior electrothermal conversion and low mid-IR emissivity of MXene nanomaterials.
开发能够在可见光和红外（IR）区域自适应变色的仿生伪装材料是一项有趣但具有挑战性的任务。在此，我们报告了一种新兴策略，通过将具有立方纳米结构的新型可光聚合蓝相液晶原位可控生长到高度取向的MXene纳米结构薄膜上，来制备动态可见光和红外伪装材料。所得的集成MXene的3D软光子晶体呈现出鲜艳的结构颜色，并在低直流电场下在明亮彩色状态和暗黑色状态之间实现可逆切换。作为例证，展示了允许像素可控电致变色的概念验证像素化器件。此外，制备了这种3D软光子晶体的独立式电致变色柔性薄膜，通过利用MXene纳米材料优异的电热转换和低中红外发射率实现了可见光电致变色和热伪装。
