CN110766119B - Physical unclonable structural color anti-counterfeit label with multiple anti-counterfeit modes - Google Patents
Physical unclonable structural color anti-counterfeit label with multiple anti-counterfeit modes Download PDFInfo
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/06009—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code with optically detectable marking
- G06K19/06018—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code with optically detectable marking one-dimensional coding
- G06K19/06028—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code with optically detectable marking one-dimensional coding using bar codes
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/02—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the selection of materials, e.g. to avoid wear during transport through the machine
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Abstract
The invention discloses a physical unclonable structural color anti-counterfeit label with multiple anti-counterfeit modes. The transparent black background substrate consists of a patterned surface layer with a disordered optical structure, a transparent white middle layer and a black background bottom layer. The white color caused by incoherent scattering of light of the disordered optical structure surface layer is matched with the white intermediate layer, and the disordered optical structure surface layer is hidden; in the anti-counterfeiting label, the white middle layer becomes transparent, the black bottom layer uniformly absorbs light, the color saturation of the structural color surface layer is improved, and the structural color surface layer pattern is displayed. This achieves a first, invisible security mode that is visible to the naked eye. After the structural color surface layer meets water, the reflection spectrum of the structural color surface layer is red shifted, so that a second spectrum anti-counterfeiting mode is realized. The random arrangement of the monodisperse microspheres in the disordered optical structure has the property of physical unclonable, and can be identified by means of artificial intelligence, so that a third physical unclonable anti-counterfeiting mode is realized.
Description
Technical Field
The invention relates to an anti-counterfeiting label based on structural colors, in particular to a physical unclonable structural color anti-counterfeiting label with multiple anti-counterfeiting modes, and belongs to the technical fields of anti-counterfeiting materials and structural color materials.
Background
Counterfeit is a global problem, and not only causes huge economic loss, but also brings huge harm to individuals, enterprises and even the whole society. Although a number of advanced security technologies have been developed, such as fluorescence, thermochromic, plasmonic optics, watermarking, laser holographic patterns, etc., economic losses due to counterfeiting are still rapidly growing worldwide. Therefore, there is a need to develop a more advanced, efficient, portable anti-counterfeiting technology to counter the growing situation. An ideal anti-counterfeiting strategy should be inexpensive, environmentally friendly, mass-producible, non-destructive identification, simple and convenient, and most importantly, the tag itself should not be physically cloned.
The structural color is caused by the light action of a submicron-scale special physical structure, and has the congenital advantages of permanent color fastness, green environmental protection and disorder which can be identified by naked eyes by means of equipment compared with fluorescent molecules, quantum dots or plasma optical materials. Accordingly, a number of anti-counterfeiting techniques based on the structure color iridescence effect and the smart tunable properties of colors upon external stimuli have been developed by scientists (y. Heo, h.kang, j.s. Lee, y.k. Oh, s.h. Kim, small 2016, 12, 3819; s.l. Wu, b.q. Liu, x.su, s.f. Zhang, j.Phys. Chem. Lett.2017, 8, 2835; k.zhong, j.li, l.liu, s. Van Cleuvenbergen, k.song, k.clays, adv. Mate.2018, 30, e1707246; r.y. Xuan, j.p. Ge, j. Mate.chem.2012, 22, 367; h.hu, q. -w. Chen, j. Tang, x.y. Hu, x.h. Zhou, j. 2012, j. Mater, 22, 11048). However, long-range ordered periodic structures that cause iridescence still present the possibility of physical cloning by counterfeiters.
In contrast, a disordered optical structure that causes a non-iridescent structural color is produced due to the random arrangement of monodisperse submicron particles therein (y.f. Zhang, b.q. Dong, a. Chen, x.h. Liu, l. Shi, j. Zi, adv. Mat 2015, 27, 4719; j.m. Zhou, p. Han, m.j. Liu, h.y. Zhou, y.x. Zhang, j.k. Jiang, p. Liu, y.wei, y.l. Song, x.yao, angel. Chem. Int. Ed. 2017, 56, 10462; d.ge, e.lee, l. Yang, y. Cho, m.li, d.s. Gianola, s. Yang, adv. 2015, 27, 2489; y.x. Zhang, p. Han, h.y. Zhou, y.y. Zan, y.y. Song, y.y.y. Song, y.y.y.y.y.21, y.y.y.y.green, y.y.y.25, y.y.y.y.y.green; Y, takeoka, S, yoshioka, A, takano, S, arai, K, nuvannonaj, H, nishihara, M, teshima, Y, ohtsuka, T, seki, angew, chem, int, ed. 2013, 52, 7261.) has physical unclonable properties. However, its weak unobtrusive color of the non-iridescent structure has led to a constant neglect of its application in the field of security.
Disclosure of Invention
The invention aims to provide a physical unclonable structural color anti-counterfeit label with multiple anti-counterfeit modes.
The structural color anti-counterfeiting label consists of a disordered optical structure patterning surface layer, a middle white layer which becomes transparent when meeting water and a black bottom layer.
Wherein the unordered optical structure patterning surface layer is formed by randomly arranging monodisperse colloid particles; the middle white layer which becomes transparent when meeting water is formed by dispersing nano particles into a hydrophilic polymer framework; the black background bottom layer is one of plastics, ceramics, metals, cloth, glass, wood, paper, etc.
The monodisperse colloidal particles are selected from one of styrene colloidal microspheres, polymethyl methacrylate colloidal microspheres, polystyrene-polymethyl methacrylate-polyacrylic acid colloidal microspheres, silicon dioxide colloidal microspheres, titanium dioxide colloidal microspheres, ferric sulfide colloidal microspheres, elemental sulfur colloidal microspheres, gold colloidal microspheres and silver colloidal microspheres, and the size of the monodisperse colloidal particles is 120 nm-1000 nm.
The nano particles are selected from one or a mixture of more of silicon dioxide nano particles, calcium fluoride nano particles, titanium dioxide nano particles, zinc oxide nano particles, indium oxide nano particles, tin oxide nano particles and indium tin oxide nano particles, and the particle size is 5-100 nm.
The hydrophilic polymer is one of acrylic acid modified polyurethane, polyacrylic resin, polyvinyl alcohol resin, polyamide and polyhydroxyethyl methacrylate, and the mass ratio of the hydrophilic polymer to the nano particles is 0.1:1-2:1.
The spectrum range corresponding to the structural color is 390-800 nm, and the whole visible light region is covered.
The anti-counterfeiting label has the advantages that after the anti-counterfeiting label meets water, the unordered optical structure patterning surface layer appears, and the reflection spectrum of the anti-counterfeiting label is red shifted by 10-50 nm.
The invention has the beneficial effects that the multiple anti-counterfeiting mode of the non-iridescent structural color anti-counterfeiting label is realized by utilizing the special water-changed transparent intermediate layer through the multi-coating design. Firstly, hiding the patterns of the structural color surface layer by utilizing the hue matching of the structural color optical surface layer and the white intermediate layer; after the middle layer becomes transparent when meeting water, the exposed black background bottom layer improves the saturation of the structural color, and the structural color surface layer patterns are displayed. This is the first macroscopic invisible anti-counterfeiting pattern. After meeting water, the reflection spectrum of the structural color layer is subjected to unique red shift, which is a second anti-counterfeiting mode identified by spectrum. The random arrangement of monodisperse colloidal particles in a disordered optical structure has the physical unclonable property, which is the third ternary security mode. The anti-counterfeiting label has the safety attribute of easy identification and unclonable property, and has important application prospect in a plurality of safety fields.
Drawings
Fig. 1. The embodiment 1 of the invention shows the anti-counterfeit label with butterfly pattern hidden in the white middle coating and exposed to water.
Fig. 2 shows the reflection spectrum of the unordered optical structure coating of the anti-counterfeit label in embodiment 1 of the invention before and after water contact.
Fig. 3 is an SEM photograph of a disordered optical structural coating of an security tag in example 1 of the present invention.
Detailed Description
Example 1
First, 20 nm of SiO 2 Nanoparticles and SiO occupancy 2 The mass ratio of the nano particles is 0.8:1, acrylic modified polyurethane ultrasonically dispersing water to form SiO 2 A dispersion with a mass fraction of nanoparticles of 10%. Second, the dispersion was spin-coated onto a black cardboard to form an intermediate white coating having water-transparency properties. Thirdly, spraying the emulsion containing the monodisperse polystyrene-polymethyl methacrylate-polyacrylic acid colloid microspheres with the mass fraction of 205-nm to the middle white to obtain the non-iridescent structural color anti-counterfeiting label with the disordered optical structure of the butterfly pattern. When dried, the white of the disordered optical structure coating is close to that of the intermediate coating, and the butterfly pattern is hidden, as shown in fig. 1; upon becoming water, the green butterfly pattern appears (fig. 1). This achieves a first heavy invisible security mode. The reflection spectrum of the coating with the disordered optical structure is shifted from 490 to nm to 510 to nm before and after encountering water, and is red shifted by 20 to nm as shown in fig. 2, thereby realizing a second multispectral anti-counterfeiting mode. The monodisperse colloidal particles in the disordered optical structured coating are arranged in a random manner (fig. 3) to achieve a third ternary security pattern with physical unclonability.
Example 2
Firstly, 5 nm calcium fluoride nano-particles are mixed with polyacrylic resin accounting for 0.1:1 of the mass ratio of the calcium fluoride nano-particles and are ultrasonically dispersed in water, so that a dispersion liquid with the mass fraction of the calcium fluoride nano-particles of 10% is formed. Secondly, dip-coating the dispersion liquid on black PVC plastic paper to form an intermediate white coating with water-soluble transparent property. Thirdly, spraying the emulsion containing the monodisperse silica gel microspheres with the mass fraction of 120 nm to the middle white to obtain the non-iridescent structural color anti-counterfeiting label with the disordered optical structure of the two-dimensional code pattern. When the two-dimensional code is dried, the white of the unordered optical structure coating is close to the white of the middle coating, and the two-dimensional code pattern is hidden; after the color is changed when meeting water, the purple two-dimensional code pattern appears. This achieves a first heavy invisible security mode. The reflection spectrum of the coating with the disordered optical structure is shifted from 380 nm to 390 nm and shifted by 10 nm in red before and after water contact, so that the second spectrum anti-counterfeiting mode is realized. The monodisperse colloidal particles in the disordered optical structure coating are arranged in a random manner, so that the third anti-counterfeiting mode with physical unclonability is realized.
Example 3
First, the mass ratio of the titanium dioxide nano-particles to the titanium dioxide nano-particles of 100 nm is 2:1, ultrasonically dispersing water in the polyvinyl alcohol resin to form a dispersion liquid with the mass fraction of titanium dioxide nano particles being 10%. Secondly, dip-coating the dispersion on a black metal sheet to form an intermediate white coating layer with water-transparent property. Thirdly, spraying the emulsion containing the monodisperse polystyrene colloid microspheres with the mass fraction of 1000 nm to the middle white to obtain the non-iridescent structural color anti-counterfeiting label with the disordered optical structure of the bar code pattern. When the coating is dried, the white color of the unordered optical structure coating is close to that of the intermediate coating, and the bar code pattern is hidden; after the color is changed when meeting water, the red bar code pattern appears. This achieves a first heavy invisible security mode. The reflection spectrum of the coating with the disordered optical structure is shifted from 750 nm to 800 nm and shifted by 50 nm in red before and after water contact, so that the second spectrum anti-counterfeiting mode is realized. The monodisperse colloidal particles in the disordered optical structure coating are arranged in a random manner, so that the third anti-counterfeiting mode with physical unclonability is realized.
Example 4
First, 30 nm zinc oxide nanoparticles and a polyamide resin accounting for 1:1 of the mass ratio of the zinc oxide nanoparticles are mixed and ultrasonically dispersed with water to form a dispersion liquid with the mass fraction of the titanium dioxide nanoparticles of 10%. Secondly, dip-coating the dispersion on a black metal sheet to form an intermediate white coating layer with water-transparent property. Thirdly, spraying the emulsion containing the monodisperse polystyrene colloid microspheres with the mass fraction of 1000 nm to the middle white to obtain the non-iridescent structural color anti-counterfeiting label with the disordered optical structure of the bar code pattern. When the coating is dried, the white color of the unordered optical structure coating is close to that of the intermediate coating, and the bar code pattern is hidden; after the color is changed when meeting water, the red bar code pattern appears. This achieves a first heavy invisible security mode. The reflection spectrum of the coating with the disordered optical structure is shifted from 750 nm to 800 nm and shifted by 50 nm in red before and after water contact, so that the second spectrum anti-counterfeiting mode is realized. The monodisperse colloidal particles in the disordered optical structure coating are arranged in a random manner, so that the third anti-counterfeiting mode with physical unclonability is realized.
Example 5
First, the mass ratio of the indium oxide nanoparticles of 30 nm to the indium oxide nanoparticles is 0.5:1 and ultrasonically dispersing water to form dispersion liquid with indium oxide nanometer particle mass fraction of 10%. Second, dip-coating the above dispersion onto a black ceramic substrate to form an intermediate white coating having water-transparency-imparting properties. Thirdly, spraying the emulsion containing the monodisperse polymethyl methacrylate microspheres with the mass fraction of 250 nm to the middle white to obtain the non-iridescent structural color anti-counterfeiting label with the disordered optical structure of the bar code pattern. When the coating is dried, the white color of the unordered optical structure coating is close to that of the intermediate coating, and the bar code pattern is hidden; after the color is changed when meeting water, the red bar code pattern appears. This achieves a first heavy invisible security mode. The reflection spectrum of the coating with the disordered optical structure is shifted from 720 nm to 750 nm and shifted by 30 nm in red before and after water contact, so that the second spectrum anti-counterfeiting mode is realized. The monodisperse colloidal particles in the disordered optical structure coating are arranged in a random manner, so that the third anti-counterfeiting mode with physical unclonability is realized.
Example 6
First, the mass ratio of the indium oxide nanoparticles of 30 nm to the indium oxide nanoparticles is 0.5:1 and ultrasonically dispersing water to form dispersion liquid with indium oxide nanometer particle mass fraction of 10%. Second, dip-coating the above dispersion onto a black ceramic substrate to form an intermediate white coating having water-transparency-imparting properties. Thirdly, spraying the emulsion containing the monodisperse polymethyl methacrylate microspheres with the mass fraction of 250 nm to the middle white to obtain the non-iridescent structural color anti-counterfeiting label with the disordered optical structure of the bar code pattern. When the coating is dried, the white color of the unordered optical structure coating is close to that of the intermediate coating, and the bar code pattern is hidden; after the color is changed when meeting water, the red bar code pattern appears. This achieves a first heavy invisible security mode. The reflection spectrum of the coating with the disordered optical structure is shifted from 720 nm to 750 nm and shifted by 30 nm in red before and after water contact, so that the second spectrum anti-counterfeiting mode is realized. The monodisperse colloidal particles in the disordered optical structure coating are arranged in a random manner, so that the third anti-counterfeiting mode with physical unclonability is realized.
Example 7
First, the mass ratio of the tin oxide nanoparticles of 30 nm to the tin oxide nanoparticles is 0.5:1 and ultrasonically dispersing water to form a dispersion liquid with the mass fraction of the tin oxide nano particles of 10%. Second, dip-coating the above dispersion onto a black wood substrate to form an intermediate white coating having water-transparency-imparting properties. Thirdly, the emulsion containing the monodisperse titanium dioxide colloid microsphere with the mass fraction of 180 nm is printed to the middle white color by inkjet, and the non-iridescent structural color anti-counterfeiting label with the disordered optical structure of the digital pattern is obtained. When the coating is dried, the white color of the disordered optical structure coating is close to that of the intermediate coating, and the digital pattern is hidden; upon water change, the cyan barcode pattern appears. This achieves a first heavy invisible security mode. The reflection spectrum of the coating with the disordered optical structure is shifted from 480 nm to 490 nm and shifted by 10 nm in red before and after water contact, thereby realizing a second spectrum anti-counterfeiting mode. The monodisperse colloidal particles in the disordered optical structure coating are arranged in a random manner, so that the third anti-counterfeiting mode with physical unclonability is realized.
Example 8
First, the mass ratio of the indium tin oxide nanoparticles to the indium tin oxide nanoparticles of 30 nm is 0.5:1 and ultrasonically dispersing water to form dispersion liquid with indium tin oxide particle mass fraction of 10%. Second, dip-coating the above dispersion onto a black glass substrate to form an intermediate white coating having water-transparency-imparting properties. Thirdly, spraying the emulsion containing the monodisperse ferric sulfide colloid microspheres with the particle size of 250 nm and the mass fraction of 10% to the middle white to obtain the non-iridescent structural color anti-counterfeiting label with the disordered optical structure of the letter pattern. When the coating is dried, the white color of the disordered optical structure coating is close to that of the intermediate coating, and the letter patterns are hidden; after the color is changed when meeting water, the red letter code pattern appears. This achieves a first heavy invisible security mode. The reflection spectrum of the coating with the disordered optical structure is shifted from 720 nm to 750 nm and shifted by 30 nm in red before and after water contact, so that the second spectrum anti-counterfeiting mode is realized. The monodisperse colloidal particles in the disordered optical structure coating are arranged in a random manner, so that the third anti-counterfeiting mode with physical unclonability is realized.
Example 9
First, the mass ratio of the indium tin oxide nanoparticles to the indium tin oxide nanoparticles of 30 nm is 0.5:1 and ultrasonically dispersing water to form a dispersion liquid with the mass fraction of indium tin oxide particles of 10%. Second, dip-coating the above dispersion onto a black glass substrate to form an intermediate white coating having water-transparency-imparting properties. Thirdly, spraying the emulsion containing the monodisperse gold colloid microspheres with the particle size of 250 nm and the mass fraction of 5% to the middle white to obtain the non-iridescent structural color anti-counterfeiting label with the disordered optical structure of the letter pattern. When the coating is dried, the white color of the disordered optical structure coating is close to that of the intermediate coating, and the letter patterns are hidden; after the color is changed when meeting water, the red letter code pattern appears. This achieves a first heavy invisible security mode. The reflection spectrum of the coating with the disordered optical structure is shifted from 720 nm to 750 nm and shifted by 30 nm in red before and after water contact, so that the second spectrum anti-counterfeiting mode is realized. The monodisperse colloidal particles in the disordered optical structure coating are arranged in a random manner, so that the third anti-counterfeiting mode with physical unclonability is realized.
Example 10
First, the mass ratio of the indium tin oxide nanoparticles to the indium tin oxide nanoparticles of 30 nm is 0.5:1 (mass ratio of 1:1) and ultrasonically dispersing water to form a dispersion liquid with the mass fraction of indium tin oxide particles of 10%. Second, dip-coating the above dispersion onto a black leather substrate to form an intermediate white coating having water-transparency properties. Thirdly, spraying the emulsion containing the monodisperse silver colloid microspheres with the particle size of 250 nm and the mass fraction of 5% to the middle white to obtain the non-iridescent structural color anti-counterfeiting label with the disordered optical structure of the letter pattern. When the coating is dried, the white color of the disordered optical structure coating is close to that of the intermediate coating, and the letter patterns are hidden; after the color is changed when meeting water, the red letter code pattern appears. This achieves a first heavy invisible security mode. The reflection spectrum of the coating with the disordered optical structure is shifted from 720 nm to 750 nm and shifted by 30 nm in red before and after water contact, so that the second spectrum anti-counterfeiting mode is realized. The monodisperse colloidal particles in the disordered optical structure coating are arranged in a random manner, so that the third anti-counterfeiting mode with physical unclonability is realized.
Example 12
First, the mass ratio of the indium tin oxide nanoparticles to the indium tin oxide nanoparticles of 30 nm is 0.5:1, a mixture of the poly (phtalamine) and the poly (hydroxyethyl methacrylate) and the poly (acrylic acid) resin (the mass ratio is 1:1:1) is mixed and dispersed in water by ultrasonic to form a dispersion liquid with the mass fraction of the indium tin oxide particles of 10 percent. Second, dip-coating the above dispersion onto a black leather substrate to form an intermediate white coating having water-transparency properties. Thirdly, spraying the emulsion containing the monodisperse silver colloid microspheres with the particle size of 250 nm and the mass fraction of 5% to the middle white to obtain the non-iridescent structural color anti-counterfeiting label with the disordered optical structure of the letter pattern. When the coating is dried, the white color of the disordered optical structure coating is close to that of the intermediate coating, and the letter patterns are hidden; after the color is changed when meeting water, the red letter code pattern appears. This achieves a first heavy invisible security mode. The reflection spectrum of the coating with the disordered optical structure is shifted from 720 nm to 750 nm and shifted by 30 nm in red before and after water contact, so that the second spectrum anti-counterfeiting mode is realized. The monodisperse colloidal particles in the disordered optical structure coating are arranged in a random manner, so that the third anti-counterfeiting mode with physical unclonability is realized.
Example 11
First, 30 nm indium oxide, 20 nm silica nanoparticles, 10 nm zinc oxide nanoparticles (mass ratio of 1:1:1) were mixed with a mixture of polyacrylamide and polyhydroxyethyl methacrylate (mass ratio of 1:1) at a mass ratio of 0.5:1 of nanoparticles, and water was ultrasonically dispersed to form a dispersion liquid having a mass fraction of nanoparticles of 10%. Second, dip-coating the above dispersion onto black wood to form an intermediate white coating having water-transparency properties. Thirdly, spraying the emulsion containing the monodisperse silver colloid microspheres with the particle size of 250 nm and the mass fraction of 5% to the middle white to obtain the non-iridescent structural color anti-counterfeiting label with the disordered optical structure of the letter pattern. When the coating is dried, the white color of the disordered optical structure coating is close to that of the intermediate coating, and the letter patterns are hidden; after the color is changed when meeting water, the red letter code pattern appears. This achieves a first heavy invisible security mode. The reflection spectrum of the coating with the disordered optical structure is shifted from 720 nm to 750 nm and shifted by 30 nm in red before and after water contact, so that the second spectrum anti-counterfeiting mode is realized. The monodisperse colloidal particles in the disordered optical structure coating are arranged in a random manner, so that the third anti-counterfeiting mode with physical unclonability is realized.
Example 11
First, 30 nm indium oxide, 20 nm silica nanoparticles, and 0.5 mass ratio of the silica nanoparticles: 1 (mass ratio of 1:1) and ultrasonically dispersing water to form a dispersion with 10% mass fraction of nano particles. Secondly, dip-coating the dispersion on black cloth to form an intermediate white coating layer with water-transparent property. Thirdly, spraying the emulsion containing the monodisperse silver colloid microspheres with the particle size of 250 nm and the mass fraction of 5% to the middle white to obtain the non-iridescent structural color anti-counterfeiting label with the disordered optical structure of the letter pattern. When the coating is dried, the white color of the disordered optical structure coating is close to that of the intermediate coating, and the letter patterns are hidden; after the color is changed when meeting water, the red letter code pattern appears. This achieves a first heavy invisible security mode. The reflection spectrum of the coating with the disordered optical structure is shifted from 720 nm to 750 nm and shifted by 30 nm in red before and after water contact, so that the second spectrum anti-counterfeiting mode is realized. The monodisperse colloidal particles in the disordered optical structure coating are arranged in a random manner, so that the third anti-counterfeiting mode with physical unclonability is realized.
Claims (5)
1. A physical unclonable structural color security tag with multiple security modes, characterized in that: patterning the surface layer by a disordered optical structure a middle white layer and a black background bottom layer which are transparent when meeting water;
wherein the unordered optical structure patterning surface layer is formed by randomly arranging monodisperse colloid particles; the middle white layer which becomes transparent when meeting water is formed by dispersing nano particles into a hydrophilic polymer framework; the black background bottom layer is one of plastics, ceramics, metal, cloth, glass, wood and paper.
2. The security tag of claim 1, wherein the monodisperse colloidal particles are selected from one of styrene colloidal microspheres, polymethyl methacrylate colloidal microspheres, polystyrene-polymethyl methacrylate-polyacrylic acid colloidal microspheres, silica colloidal microspheres, titania colloidal microspheres, iron sulfide colloidal microspheres, elemental sulfur colloidal microspheres, gold colloidal microspheres, and silver colloidal microspheres, and have a size of 120 nm-1000 nm.
3. The security tag of claim 1 wherein: the nano particles are selected from one or a mixture of more of silicon dioxide nano particles, calcium fluoride nano particles, titanium dioxide nano particles, zinc oxide nano particles, indium oxide nano particles, tin oxide nano particles and indium tin oxide nano particles, and the particle size is 5-100 nm.
4. The security tag of claim 1 wherein: the hydrophilic polymer is one of acrylic acid modified polyurethane, polyacrylic resin, polyvinyl alcohol resin, polyamide and polyhydroxyethyl methacrylate, and the mass ratio of the hydrophilic polymer to the nano particles is 0.1:1-2:1.
5. The security tag of claim 1 wherein: the spectrum range corresponding to the structural color is 390-800 nm, and the whole visible light region is covered.
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| CN113990844A (en) * | 2021-10-25 | 2022-01-28 | 西安交通大学 | Preparation method of anti-counterfeit label based on multilayer quasi-amorphous photon heterostructure |
| CN114409376B (en) * | 2022-01-24 | 2023-03-21 | 陕西科技大学 | Preparation method of high-saturation amorphous photonic crystal structure colored glaze |
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