Abstract
Unlike color dyes, structural colors only slightly fade during long-term usage. Here, structural colors were controllably achieved by constructing CoFeB photonic crystal layers on the surface of a nanoporous aluminum oxide (AAO) substrate by magnetron sputtering deposition. The resulting material showed a wide visible spectral response and achieved structural color control with a high resolution, high color purity, and saturation. The angle-dependent color changes of CoFeB@AAO films were further investigated by changing the incident light angle. The simulation results of the model are consistent with the experiments, which is significant in practical applications. This strategy may have great potential applications for solid structure color coatings, anti-counterfeiting and security, information storage, and electromagnetic sensors.
Highlights
Published: 16 September 2021In contrast to coloration using dyes, structural colors are usually produced by geometric structures
The resulting photonic crystal nanostructures were manipulated by adjusting the thickness of the CoFeB layers and the pore diameter of the a nanoporous aluminum oxide (AAO) template
Co40 Fe40 B20 thin films with a thickness of 16.3 nm were deposited on AAO templates with pore diameters of 30, 50, 70, and 90 nm (AAO interpore distance: 110 nm; pore depth: 300 nm) as sample series 1-1
Summary
In contrast to coloration using dyes, structural colors are usually produced by geometric structures. One of the most efficient methods for structural colors is to fabricate periodic arrayed artificial photonic crystals on a substrate, which can be a functional polymer such as a hydrogel, polyelectrolyte, or elastomers [12,13]. Preparation of these complicated structures is very difficult, and an external field is often required to improve the desired saturation of colors [14]. The resulting photonic crystal nanostructures were manipulated by adjusting the thickness of the CoFeB layers and the pore diameter of the AAO template. The related physical mechanism was further studied by theoretical simulations based on the structure of the self-assembled photonic crystals, which matched the experimental results very well
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