Auxetic Photonic Patterns with Ultrasensitive Mechanochromism
- 주제(키워드) auxetic patterns , mechanochromism , photonic bandgap , photonic crystals , structure colors
- 관리정보기술 faculty
- 등재 SCIE, SCOPUS
- OA유형 Gold Open Access
- 발행기관 John Wiley and Sons Inc
- 발행년도 2024
- URI http://www.dcollection.net/handler/ewha/000000213835
- 본문언어 영어
- Published As https://doi.org/10.1002/advs.202304022
- PubMed 37942590
초록/요약
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. © 2023 The Authors. Advanced Science published by Wiley-VCH GmbH.
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