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Auxetic Photonic Patterns with Ultrasensitive Mechanochromism
Advanced Science ( IF 14.3 ) Pub Date : 2023-11-09 , DOI: 10.1002/advs.202304022 Hwan-Young Lee 1 , Minbon Gu 2 , Jeonghee Hwang 2, 3 , Hyerim Hwang 4 , Young-Seok Kim 5 , Su Yeon Lee 2, 3 , Shin-Hyun Kim 1
Advanced Science ( IF 14.3 ) Pub Date : 2023-11-09 , DOI: 10.1002/advs.202304022 Hwan-Young Lee 1 , Minbon Gu 2 , Jeonghee Hwang 2, 3 , Hyerim Hwang 4 , Young-Seok Kim 5 , Su Yeon Lee 2, 3 , Shin-Hyun Kim 1
Affiliation
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Photonic crystals with mechanochromic properties are currently under intensive study to provide intuitive colorimetric detection of strains for various applications. However, the sensitivity of color change to strain is intrinsically limited, as the degree of deformation determines the wavelength shift. To overcome this limitation, auxetic photonic patterns that exhibit ultra-sensitive mechanochromism are designed. These patterns have a regular arrangement of cuts that expand to accommodate the strain, while the skeletal framework undergoes torsional deformation. Elastic photonic crystals composed of a non-close-packed array of colloidal particles are embedded in the cut area of the auxetic patterns. As the cut area amplifies the strains, the elastic photonic crystals show significant color change even for small total strains. The degree of local-strain amplification, or sensitivity of color change, is controllable by adjusting the width of cuts in the auxetic framework. In this work, a maximum sensitivity of up to 60 nm/% is achieved, which is 20 times higher than bulk films. It is believed that the auxetic photonic patterns with ultra-sensitive mechanochromism will provide new opportunities for the pragmatic use of mechanochromic materials in various fields, including structural health monitoring.
中文翻译：
具有超灵敏机械变色的拉胀光子图案
具有机械致变色特性的光子晶体目前正在深入研究中，以便为各种应用提供直观的应变比色检测。然而，颜色变化对应变的敏感性本质上是有限的，因为变形程度决定了波长偏移。为了克服这一限制，设计了具有超灵敏机械变色性的拉胀光子图案。这些图案具有规则的切口排列，可以扩展以适应应变，同时骨骼框架会发生扭转变形。由非密堆积胶体颗粒阵列组成的弹性光子晶体嵌入拉胀图案的切割区域。随着切割区域放大应变，即使总应变很小，弹性光子晶体也会表现出显着的颜色变化。局部应变放大的程度或颜色变化的敏感性可以通过调整拉胀框架中的切口宽度来控制。在这项工作中，实现了高达 60 nm/% 的最大灵敏度，比体膜高 20 倍。相信具有超灵敏力致变色现象的拉胀光子图案将为力致变色材料在包括结构健康监测在内的各个领域的实用化应用提供新的机遇。
更新日期：2023-11-09
中文翻译：
具有超灵敏机械变色的拉胀光子图案
具有机械致变色特性的光子晶体目前正在深入研究中，以便为各种应用提供直观的应变比色检测。然而，颜色变化对应变的敏感性本质上是有限的，因为变形程度决定了波长偏移。为了克服这一限制，设计了具有超灵敏机械变色性的拉胀光子图案。这些图案具有规则的切口排列，可以扩展以适应应变，同时骨骼框架会发生扭转变形。由非密堆积胶体颗粒阵列组成的弹性光子晶体嵌入拉胀图案的切割区域。随着切割区域放大应变，即使总应变很小，弹性光子晶体也会表现出显着的颜色变化。局部应变放大的程度或颜色变化的敏感性可以通过调整拉胀框架中的切口宽度来控制。在这项工作中，实现了高达 60 nm/% 的最大灵敏度，比体膜高 20 倍。相信具有超灵敏力致变色现象的拉胀光子图案将为力致变色材料在包括结构健康监测在内的各个领域的实用化应用提供新的机遇。
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