Multistage safety code based on responsive CdS photonic crystal organohydrogel

Chen, Zihao; Jia, Hong; Liu, Zihan; Chen, Yiping; Wei, Jie

doi:10.1016/j.cej.2023.148185

Cited by 8 publications

(2 citation statements)

References 58 publications

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“…As research into photonic crystals progresses, PCs are being prepared by researchers using nanoparticles with high refractive index. 19 Typically, conventional photonic crystals are composed of materials with low refractive index, resulting in significant variations in hue and chroma of the structural color when observed from different angles. High-refractive-index materials not only ensure color saturation of the structure but also effectively reduce the angle dependence of photonic crystals.…”

Section: ■ Introductionmentioning

confidence: 99%

“…PCs are predominantly mostly made of polystyrene (PS), poly(methyl methacrylate) (PMMA), silicon dioxide (SiO 2 ), etc. As research into photonic crystals progresses, PCs are being prepared by researchers using nanoparticles with high refractive index . Typically, conventional photonic crystals are composed of materials with low refractive index, resulting in significant variations in hue and chroma of the structural color when observed from different angles.…”

Section: Introductionmentioning

confidence: 99%

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Dual-Mode Multicolor Display Based on Structural and Fluorescent Color CdS Photonic Crystal Hydrogel

Liu,

Chen,

Yang

et al. 2024

Langmuir

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In this study, we prepared a multicolor structural− fluorescent CdS−PEGDA photonic crystal hydrogel (SFC-CPH) with a dual display mode, which has two different optical states: structural color mode and fluorescent color mode. SFC-CPH displays structural color mode under visible light and fluorescent color mode under ultraviolet light. Initially, monodisperse CdS colloidal particles were synthesized via a hydrothermal method, leading to the self-assembly of a photonic crystal template. The high refractive index of CdS contributes to the photonic crystals' low-angle dependence and vivid structural colors. Then, a variety of fluorescent molecules were doped into poly(ethylene glycol) diacrylate (PEGDA) hydrogel and combined with photonic crystals with distinct structural colors to prepare three distinct colors of SFC-CPH. We also investigated the optical characteristics and surface properties of these photonic crystal hydrogels. Based on these dual-mode display characteristics, we designed several dual-mode display patterns and a method for information encoding. The unique property of this photonic crystal hydrogel material suggests its substantial potential for applications in information storage, security, and encoding, offering innovative avenues in the realm of information display.

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Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dual-Mode Multicolor Display Based on Structural and Fluorescent Color CdS Photonic Crystal Hydrogel

Liu,

Chen,

Yang

et al. 2024

Langmuir

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Ultra‐Bright Stimuli‐Responsive Photonic Crystals for High‐Performance Anticounterfeiting Coatings

Tian,

Zhu,

Guo

et al. 2024

Advanced Optical Materials

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Photonic crystals (PCs) with unique light manipulation capability have attracted widespread attentions. However, weak photonic bandgaps, poor structural color saturation, and tedious preparation process restrict their further development and practical application. Herein, an ultra‐bright stimuli‐responsive PC film with excellent optical performance is prepared by assembly of cadmium sulfide@polyacrylic acid (CdS@PAA) core–shell nanoparticles into PCs through molecule‐mediated shearing‐induced assembly technique (MSAT), this fabrication process is fast and facile, the solid periodic micro/nano‐structures can be formed within 10 s, and a wide selection range of structural color can be obtained. The high refractive index of CdS guarantees high brightness of the PC films. The prerequisite of using MSAT for preparation of large‐sized ultra‐bright PC film is that the CdS@PAA nanoparticles possess appropriate thickness of PAA shell. Compared with conventional PCs, the ultra‐bright PC films present strong photonic bandgaps and high structural color saturation, the relative reflectance is up to 130% compared with a standard aluminum mirror, which is more than four times reflectivity of PS@PAA microspheres. In addition, the PC paint is prepared by mashing the ultra‐bright PC film and blending it with transparent polydimethylsiloxane (PDMS) matrix, the PC coating prepared by alkali treated ultra‐bright PC pigments can achieve good water response ability and anticounterfeiting effect.

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Two viologen-based complexes as persistent luminescent materials and their applications in inkless print and anticounterfeiting

Yang,

Xiao,

Yang

et al. 2024

Chemical Engineering Journal

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Multistage safety code based on responsive CdS photonic crystal organohydrogel

Cited by 8 publications

References 58 publications

Dual-Mode Multicolor Display Based on Structural and Fluorescent Color CdS Photonic Crystal Hydrogel

Dual-Mode Multicolor Display Based on Structural and Fluorescent Color CdS Photonic Crystal Hydrogel

Ultra‐Bright Stimuli‐Responsive Photonic Crystals for High‐Performance Anticounterfeiting Coatings

Two viologen-based complexes as persistent luminescent materials and their applications in inkless print and anticounterfeiting

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