Self-assembly of icosahedral cluster and its photonic properties
발표자
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초록
내용
Icosahedral colloidal clusters are a new class of spherical colloidal crystals. However, the optical characterization of the icosahedral cluster has not been achieved. Here, we produce icosahedral clusters by slowly shrinking particle-laden water droplets in water-saturated oil and characterize their optical properties. We controlled the drying time of aqueous droplets using a water-saturated hexadecane medium for preparation of the icosahedral cluster. In particular, we present real-time clustering using dual dye labeling under fluorescent confocal microscopy. The icosahedral clusters exhibit relatively strong structural colors compared to conventional onion-like supraballs. Simulations prove that the crystalline array inside the icosahedral cluster strengthens the collective specular diffraction. Moreover, the carbon-coated clusters further improve the saturation of structural colors.