Mr. Seamin Park Profile

Seamin Park

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Proceedings Article | 13 March 2024 Poster + Paper

Mechanochromic photonic sensor using highly refractive colloidal particles

Seamin Park, Sanghoon Lee, Young-Seok Kim

Proceedings Volume 12896, 128960E (2024) https://doi.org/10.1117/12.3002804

KEYWORDS: Particles, Color, Sensors, Iron, Photodetectors, Oxides, Silica, Refractive index, Polymers, Photonic crystals

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Structural colors have the advantage of high reflectance for specific wavelengths, and are generally implemented with SiO₂, PE, PS and PMMA. However, existing crystalline structural color films require particle alignment and precise particle uniformity control, making them difficult to manufacture and highly dependent on the viewing angle. Non-close packed structural color films are relatively free of these problems. In this study, based on high refractive index core-shell particles, we propose a mechanochromic strain sensor that can distinguish the direction, position, and degree of deformation. A film was fabricated using silica coated iron oxide core-shell particles having a high refractive index and black color. It has been demonstrated that this film sensor can display a 2D color profile in response to localized weight or strain.

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