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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