Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparation method of anti-counterfeit label based on multilayer quasi-amorphous photonic heterostructure

A heterogeneous structure and anti-counterfeiting label technology, which is applied to electrical components, electrical solid devices, circuits, etc., can solve the problems of low structural color brightness and contrast, and achieve fast response, convenient operation, and rapid response

Pending Publication Date: 2022-01-28
XI AN JIAOTONG UNIV
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to form a high refractive index difference between the hollow particles and the solvent, resulting in low structural color brightness and contrast caused by the solvent.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of anti-counterfeit label based on multilayer quasi-amorphous photonic heterostructure
  • Preparation method of anti-counterfeit label based on multilayer quasi-amorphous photonic heterostructure
  • Preparation method of anti-counterfeit label based on multilayer quasi-amorphous photonic heterostructure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1: A kind of preparation method of the anti-counterfeit label based on multi-layer quasi-amorphous photonic heterogeneous structure, specifically comprises the following steps:

[0033] Ⅰ. Preparation of colloidal particles:

[0034] (1) SiO 2 Preparation of Colloidal Particles. Mix 100ml of absolute ethanol, 7ml of deionized water and 4ml of ammonia water (25%), stir for 20 minutes, inject 8ml of tetraethyl orthosilicate (TEOS), and continue stirring for 5 hours. The waste solution was then removed by centrifugation and washed three times each with water and alcohol. Dry at 45°C and collect for later use.

[0035] (2) Fe 3 o 4 @SiO 2 Preparation of Colloidal Particles. First, monodisperse Fe was synthesized by a hydrothermal method 3 o 4 colloidal particles. The specific steps are as follows, under magnetic stirring, 1.35g FeCl 3 ·6H 2 O, 2.94g of sodium citrate and 0.9g of urea were dissolved in 80ml of deionized water, and after stirring for 30...

Embodiment 2

[0043] Embodiment 2: A kind of preparation method of the anti-counterfeiting label based on multi-layer quasi-amorphous photonic heterogeneous structure, specifically comprises the following steps:

[0044] Ⅰ. Preparation of colloidal particles:

[0045] Step is with embodiment 1, and difference is that the Fe of four kinds of grain sizes 3 o 4 @SiO 2 The amounts of TEOS used in the colloidal particles were 0.3ml, 0.4ml, 0.45ml, and 0.5ml, respectively.

[0046] Ⅱ. Mixing solution:

[0047] Step is with embodiment 1.

[0048] Ⅲ. Preparation of multi-layer quasi-amorphous photonic heterostructure by spraying method:

[0049] First place the hollowed-out 'XJTU' mask on the substrate, and spray Fe with different particle sizes on the two letters 'X' and 'U' respectively 3 o 4 @SiO 2 . Then remove the mask and spray the configured SiO 2 Solution to 'X U' is completely hidden. Finally, place the hollow 'XJTU' mask on the previously prepared coating, and spray Fe with dif...

Embodiment 3

[0052] Embodiment 3: A kind of preparation method of the anti-counterfeit label based on multi-layer quasi-amorphous photonic heterogeneous structure, specifically comprises the following steps:

[0053] Ⅰ. Preparation of colloidal particles:

[0054] Step is the same as embodiment 1, and difference is that the SiO of two kinds of grain sizes 2 The amounts of TEOS used for the colloidal particles were 7ml and 8ml, respectively.

[0055] Ⅱ. Mixing solution:

[0056] Step is with embodiment 1.

[0057]Ⅲ. Preparation of multi-layer quasi-amorphous photonic heterostructure by spraying method:

[0058] First place the hollowed-out 'butterfly' mask on the substrate, and spray the configured Fe 3 o 4 @SiO 2 solution. Then replace the 'butterfly' with a 'petal' mask and spray the configured SiO 2 Solution until the 'butterfly' is completely hidden. Finally, place the hollowed-out 'apple' mask on top of the previously prepared coating, and spray SiO with another particle size ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Particle sizeaaaaaaaaaa
Particle sizeaaaaaaaaaa
Thicknessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation method of an anti-counterfeit label based on a multilayer quasi-amorphous photonic heterostructure. The multi-layer structure is formed by alternately spraying an ethanol solution of SiO2 and Fe3O4@SiO2 colloid particles onto a substrate through a rapid spraying method. Meanwhile, in order to obtain encrypted information of ultraviolet light response, a small number of quantum dots are doped in the spraying process. When a solvent such as ethanol permeates into the coating, the SiO2 layer becomes transparent due to the fact that the refractive index of the solvent is similar to that of SiO2, and structural color information loaded by the layer can be fully displayed due to the high refractive index difference between Fe3O4 and the solvent in the Fe3O4@SiO2 layer. After the solvent is volatilized, the SiO2 layer is opaque due to strong scattering of incident light, and information of the Fe3O4@SiO2 layer is hidden again. In addition, fluorescence information carried by the quantum dots in the Fe3O4@SiO2 layer can be further displayed in a fluorescence environment while a solvent is applied. Through the novel and flexible information encryption / decryption mode and the simple and rapid manufacturing process, the method has wide application prospects in the fields of anti-counterfeiting and multi-information encryption.

Description

technical field [0001] The invention belongs to the technical field of information encryption / anti-counterfeiting materials, and in particular relates to a method for preparing an anti-counterfeiting label based on a multi-layer quasi-amorphous photonic heterogeneous structure. Background technique [0002] Currently, with the emergence of many high-resolution scanning, detection, copying and counterfeiting technologies, counterfeiting of goods has become a global problem, bringing serious threats and negative impacts to individuals, businesses and society. The development of more novel and reliable information encryption and anti-counterfeiting technology has become an urgent problem to be solved. Over the past few decades, various anti-counterfeiting strategies have been proposed, including fingerprints, watermarks, holographic patterns, fluorescent labels, plasma labels, and structural color patterns. Among them, responsive photonic materials with visible structural colo...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H01L23/544
CPCH01L23/544H01L2223/54413H01L2223/5444
Inventor 卢学刚温小翔魏超萍刘宇婷秦宏基张锦霞
Owner XI AN JIAOTONG UNIV