Optical anti-counterfeiting mark formed on titanium dioxide mono-crystal surface by silver nanoparticles and manufacturing method thereof
A technology of silver nanoparticles and titanium dioxide is applied in the field of anti-counterfeiting, which can solve the problems of easy duplication of printing anti-counterfeiting production technology, easy loss of anti-counterfeiting function, difficulty in making anti-counterfeiting marks, etc., and achieves the effect of wavelength selectivity and high resolution.
Inactive Publication Date: 2017-01-18
FUDAN UNIV
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Problems solved by technology
[0014] Printing anti-counterfeiting production technology is easy to be copied, so it is easy to lose the anti-counterfeiting function, and it is difficult to make anti-counterfeiting marks on some items that are not easy to print
Method used
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[0035] The present invention will be further described below through specific examples (Fudan school emblem pattern).
[0036] 1. First, design and make photolithography plates of different sizes of Fudan school emblem patterns, which can be customized by relevant commercial companies.
[0037] 2. First, mix alcohol and silver nitrate solution (1 mol / L) according to the volume ratio of 1:0.8-1.2 (preferably the volume ratio is 1:1); use a pipette to draw 15-30 uL (preferably 20 uL) Drop the mixed solution on a clear and clean titanium dioxide single wafer (crystal orientation: 110); then use a hand-held ultraviolet lamp to irradiate the sample with monochromatic light with a wavelength of 365 nm, and grow on the surface of the titanium dioxide single wafer after about 3-5 minutes Formation of silver nanoparticles.
[0038]3. Then put the titanium dioxide single wafer with silver nanoparticles into a watch glass, and introduce a mixed solution of alcohol and water (volume rati...
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Abstract
The invention belongs to the technical field of anti-counterfeiting and particularly relates to an optical anti-counterfeiting mark formed on a titanium dioxide mono-crystal surface by silver nanoparticles and a manufacturing method thereof. According to the optical anti-counterfeiting mark, a silver nitrate solution is dropped onto the surface of a titanium dioxide mono-crystal sheet at first; then the surface is irradiated by an ultraviolet lamp for a plurality of minutes and the silver nanoparticles grow on the surface of the titanium dioxide mono-crystal; then, a micron-grade photoetching plate sleeves the surface of a sample; meanwhile, the silver nanoparticles are irradiated by monochromatic light; thermal electrons are transferred to have a chemical reaction and a plasma resonance peak position of the silver nanoparticles on the surface of the sample is changed, so that a pattern with a wavelength selecting property is formed. The pattern can be used as a micro-nano-grade anti-counterfeiting mark. The method provided by the invention is simple and feasible and has a very short period; the obtained anti-counterfeiting mark has the wavelength selecting property and high resolution ratio, which are not included in a common paper anti-counterfeiting mark.
Description
technical field [0001] The invention belongs to the technical field of anti-counterfeiting, and in particular relates to an anti-counterfeiting mark and a manufacturing method thereof. [0002] technical background [0003] The existing anti-counterfeiting technologies in the world are mainly divided into the following categories: [0004] (1) Paper anti-counterfeiting technology [0005] In traditional banknotes, each country has its own paper formula, adding certain substances or elements into the paper, making it a special paper for printing banknotes that is difficult to imitate. Generally speaking, the important raw material of currency special paper is the assimilation of cotton fiber and high-quality wood pulp, without adding any whitening agent, which is an important difference between banknote paper and other ordinary paper. However, if banknotes are inadvertently rinsed with a solution containing whitening agents during the circulation process, fluorescent reflect...
Claims
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IPC IPC(8): G09F3/02B22F9/24B82Y30/00
CPCB22F9/24B82Y30/00G09F3/0291
Inventor 白玉杰刘文哲陈昂张译文王杰夏雨羽王博石磊刘晓晗资剑
Owner FUDAN UNIV