Doughnut-like nanocomposite colloidal crystal particles with enhanced structural colors were
fabricated from monodisperse silica microspheres using droplet templates on polytetrafluoroethylene
(PTFE) superhydrophobic surfaces. The structural colors of the doughnut-like particles were greatly enhanced
by incorporating carbon black nanoparticles (CB-NPs) into the voids of silica colloidal crystals in
the drying self-assembly (DSA) process. The presence of CB-NPs in the structure did not lead to a shift of
the reflection band, but enhanced the diffraction color by increased reflectance and suppressed transmission.
The lack of physical contact and adhesion to the PTFE superhydrophobic surface allowed the easy detachment of the
final assemblies from the substrate, which in turn made possible the large-scale production of the doughnut-like nanocomposite
colloidal crystal particles.
Keywords: Carbon black nanoparticles, colloidal crystals, doughnut-like particles, nanocomposites, silica microspheres,
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