Controlled Assembly of Icosahedral Colloidal Clusters for Structural Coloration

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Icosahedral colloidal clusters are a new class of spherical colloidal crystals. This cluster allows for potentially superior optical properties in comparison to conventional onion-like colloidal supraballs because of the quasi-crystal structure. However, the characterization of the cluster as an optical material has until now not been achieved. Here we successfully produce icosahedral clusters by assembling silica particles using bulk water-in-oil emulsion droplets and systematically characterize their optical properties. We exploit a water-saturated oil phase to control droplet drying, thereby preparing clusters at room temperature. In comparison to conventional onion-like supraballs with a similar size, the icosahedral clusters exhibit relatively strong structural colors with weak nonresonant scattering. Simulations prove that the crystalline array inside the icosahedral cluster strengthens the collective specular diffraction. To further improve color saturation, the silica particles constituting the cluster are coated with a thin-film carbon shell. The carbon shell acts as a broad-band absorber and reduces incoherent scattering with long optical paths, resulting in vibrant blue, green, and red colors comparable to inorganic chemical pigments. © 2020 American Chemical Society
Publisher
AMER CHEMICAL SOC
Issue Date
2020-11
Language
English
Article Type
Article
Citation

CHEMISTRY OF MATERIALS, v.32, no.22, pp.9704 - 9712

ISSN
0897-4756
DOI
10.1021/acs.chemmater.0c03391
URI
http://hdl.handle.net/10203/279460
Appears in Collection
CBE-Journal Papers(저널논문)
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