辅助
光子学
材料科学
变形(气象学)
灵敏度(控制系统)
光子晶体
拉伤
结构着色
纳米技术
光电子学
复合材料
电子工程
医学
内科学
工程类
作者
H. Lee,Miṅ Gu,Jeonghee Hwang,H.L. Hwang,Young‐Seok Kim,Su Yeon Lee,Shin‐Hyun Kim
标识
DOI:10.1002/advs.202304022
摘要
Abstract 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.
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