Gas-responsiveness mesoporous colloid photonic crystal false-proof mark and preparation method thereof

Abstract

The invention discloses a gas-responsiveness mesoporous colloid photonic-crystal false-proof mark and a preparation method thereof. The gas-responsiveness mesoporous colloid photonic-crystal false-proof mark comprises a false-proof mark substrate and at least two false-proof patterns, wherein the two false-proof patterns are attached onto the surface of the false-proof mark substrate and are a first false-proof pattern and a second false-proof pattern; the first false-proof pattern and the second false-proof pattern have the same color when in normal states; the first false-proof pattern comprises a first colloid photonic crystal; the second false-proof pattern comprises a second colloid photonic crystal; the gas responsiveness of the first colloid photonic crystal is different from that of the second colloid photonic crystal. Through the adoption of the structure, the gas-responsiveness mesoporous colloid photonic-crystal false-proof mark has the advantages that the preparation cost is low; the detection mean is convenient; false-proof means are diversified; the imitation is difficult.

Description

technical field [0001] The invention relates to the field of photonic crystals, in particular to a gas-responsive mesoporous colloidal photonic crystal anti-counterfeit mark and a preparation method thereof. Background technique [0002] Photonic crystals are a kind of material with photonic bandgap characteristics in which the dielectric constant is periodically distributed in space. Light of a specific wavelength cannot pass through the photonic crystal and be reflected back. A material with the ability to modulate photons. Since S. John and E. Yablonovitch independently proposed the concept of photonic crystals in 1987, the research on photonic crystals has received extensive attention and development, especially in the fields of optical devices and optical sensors. Photonic crystals are considered to have great potential application value . [0003] Responsive photonic crystals are a class of photonic crystal materials whose own photonic band gap can respond to externa...

AI Technical Summary

Problems solved by technology

The above-mentioned responsive photonic crystals are used for anti-counterfeiting, and have the advantages of bright colors, obvious changes, short response time and high technical threshold, but there are also high production costs, single anti-counterfeiting means, and the possibility of being imitated by responsive dyes

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