Forensic-level security using non-imitable anticounterfeiting films: Humidity-sensitive 1D photonic crystals with UV-tunable color response and their encryption using small aldehydes

Hwang, Tae Gyu; Cho, Dong‐Woo; Hwang, Do‐Hoon; Jung, Yu Jin; Park, Ikbum; Kim, G.; Park, Jong Mok

doi:10.1016/j.cej.2023.145448

Cited by 7 publications

(2 citation statements)

References 46 publications

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“…Depending on material choices for the PCs synthesis (polystyrene (PS) or silica (SiO 2 ) particles) and the substrate (glass, metallic, or fabric), structural colors with iridescent effects can occur due to angular resolved Bragg diffraction from the lattice planes [6]. PCs can be applied in ink-jet printing [7,8], 3D printing [9,10], lithography [11,12] and sensors [13,14], among others [15,16], to produce structural colors. They can also be applied in textiles, an area of research that had demonstrated great interest in the last decade [6,[17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Iridescence Mimicking in Fabrics: A Ultraviolet/Visible Spectroscopy Study

Fernandes,

Pranovich,

Valyukh

et al. 2024

Biomimetics

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Poly(styrene-methyl methacrylate-acrylic acid) photonic crystals (PCs), with five different sizes (170, 190, 210, 230 and 250 nm), were applied onto three plain fabrics, namely polyamide, polyester and cotton. The PC-coated fabrics were analyzed using scanning electronic microscopy and two UV/Vis reflectance spectrophotometric techniques (integrating sphere and scatterometry) to evaluate the PCs’ self-assembly along with the obtained spectral and colors characteristics. Results showed that surface roughness of the fabrics had a major influence on the color produced by PCs. Polyamide-coated fabrics were the only samples having an iridescent effect, producing more vivid and brilliant colors than polyester and cotton samples. It was observed that as the angle of incident light increases, a hypsochromic shift in the reflection peak occurs along with the formation of new reflection peaks. Furthermore, color behavior simulations were performed with an illuminant A light source on polyamide samples. The illuminant A simulation showed greener and yellower structural colors than those illuminated with D50. The polyester and cotton samples were analyzed using scatterometry to check for iridescence, which was unseen upon ocular inspection and then proven to be present in these samples. This work allowed a better comprehension of how structural colors and their iridescence are affected by the textile substrate morphology and fiber type.

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Section: Introductionmentioning

confidence: 99%

Iridescence Mimicking in Fabrics: A Ultraviolet/Visible Spectroscopy Study

Fernandes,

Pranovich,

Valyukh

et al. 2024

Biomimetics

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show abstract

“…14–17 By further incorporating responsive materials, intelligent PCs with adjustable structural colors under external stimuli can be realized, which are expected to offer more variables in anti-counterfeiting. 18–23 Although much progress has been made in this area, the single-mode anti-counterfeiting strategy of PCs ( i.e. , structural color variation) typically confronts imitation risks when using alternatives with similar optical features.…”

Section: Introductionmentioning

confidence: 99%

Biomimetic intelligent photonic crystal composite films with tri-mode optical states for advanced anti-counterfeiting and information encryption

Yu,

Zhao,

Zhao

et al. 2023

J. Mater. Chem. C

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Humidity‐Induced Decolorization of 1D Photonic Multilayers for Anti‐Counterfeiting Applications

Kim,

Lee

et al. 2024

Adv Funct Materials

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Herein, a new concept is proposed for the humidity‐induced disappearance of the photonic stop band (PSB) in multilayer films of 1D photonic crystals (PCs). These films are fabricated via alternating spin‐coating of photo‐cross‐linkable high and low‐refractive‐index polymers onto a black polyethylene terephthalate (PET) substrate, followed by surface immobilization using UV light irradiation. The sensitivity to humidity is adjusted by varying the degree of quaternization (DQ) of the P(4VP‐co‐BPA) layers. The resulting films initially display vivid colors; however, as the humidity gradually increases, the PSB undergoes a red shift accompanied by a decrease in reflectivity, thus leading to the disappearance of the color. The reduction in reflectivity of the PSB can be attributed to the infiltration of water molecules (n = 1.33) into the quaternized high‐refractive‐index layers, thus resulting in a decrease in the refractive index and an increase in layer thickness. This leads to a diminished contrast between the refractive indices of the high‐ and low‐refractive‐index layers, ultimately causing the simultaneous disappearance of the PSB and the reflection color. Additionally, two patterned films are fabricated with high humidity responsiveness for application as anti‐counterfeiting labels. These findings advance photonic crystal research and offer innovative solutions for security and authentication.

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Forensic-level security using non-imitable anticounterfeiting films: Humidity-sensitive 1D photonic crystals with UV-tunable color response and their encryption using small aldehydes

Cited by 7 publications

References 46 publications

Iridescence Mimicking in Fabrics: A Ultraviolet/Visible Spectroscopy Study

Iridescence Mimicking in Fabrics: A Ultraviolet/Visible Spectroscopy Study

Biomimetic intelligent photonic crystal composite films with tri-mode optical states for advanced anti-counterfeiting and information encryption

Humidity‐Induced Decolorization of 1D Photonic Multilayers for Anti‐Counterfeiting Applications

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