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Nitrogen carbide quantum dot fluorescence ink

A quantum dot and nitrogen carbide technology, applied in the field of nitrogen carbide quantum dot fluorescent ink, can solve the problems of incomplete information protection and anti-counterfeiting, invisible, etc., and achieve the effects of easy operation, good effect and strong fluorescence characteristics.

Active Publication Date: 2015-08-26
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the published patents related to nanomaterials used as fluorescent inks, carbon nanomaterials (201310036988.2, 201410479599.1), nitrogen-doped carbon nanomaterials (201310036988.2), up-conversion fluorescent nanomaterials (201410718694.2), transition metal nanomaterials (201210168204.7), etc. Their nano-fluorescence emission spectrum mainly falls in the visible region, so when these materials are used as fluorescent inks to transmit information and anti-counterfeiting, the information is invisible under ordinary light, and can only be read in a specific ultraviolet environment. information, so as to achieve the effect of information encryption and anti-counterfeiting. However, due to its easy-to-obtain materials and excitation light sources, the protection and anti-counterfeiting of information is not perfect enough.

Method used

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  • Nitrogen carbide quantum dot fluorescence ink
  • Nitrogen carbide quantum dot fluorescence ink
  • Nitrogen carbide quantum dot fluorescence ink

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The specific steps of a preparation method of nitrogen carbide quantum dots are as follows:

[0019] 1) 6 g of melamine was heated at 500 °C for 2 hours under nitrogen protection to obtain a yellow powder C 3 N 4 ;

[0020] 2) put C 3 N 4 The powder was refluxed in concentrated nitric acid for 6 hours, centrifuged and washed with distilled water;

[0021] 3) 120 ℃ hydrothermal reaction for 6 hours;

[0022] 4) Centrifuge and wash with distilled water;

[0023] 5) The obtained white precipitate was sonicated in distilled water for 3 hours;

[0024] 6) Suction filtration with a 0.22 micron water phase filter membrane, and the filtrate is an aqueous solution of carbonized nitrogen quantum dots.

[0025] The carbonized nitrogen quantum dot aqueous solution is used as fluorescent ink for product anti-counterfeiting, important document protection and information encryption.

Embodiment 2

[0027] The specific steps of a preparation method of nitrogen carbide quantum dots are as follows:

[0028] 1) 15 g of melamine was heated at 600 °C for 4 hours under nitrogen protection to obtain a yellow powder C 3 N 4 ;

[0029] 2) put C 3 N 4 The powder was refluxed in concentrated nitric acid for 30 hours, centrifuged and washed with distilled water;

[0030] 3) Hydrothermal reaction at 200°C for 24 hours;

[0031] 4) Centrifuge and wash with distilled water;

[0032] 5) The obtained white precipitate was sonicated in distilled water for 16 hours;

[0033] 6) Suction filtration with a 0.22 micron water phase filter membrane, and the filtrate is an aqueous solution of carbonized nitrogen quantum dots.

[0034] The carbonized nitrogen quantum dot aqueous solution is used as fluorescent ink for product anti-counterfeiting, important document protection and information encryption.

Embodiment 3

[0036] The specific steps of a preparation method of nitrogen carbide quantum dots are as follows:

[0037] 1) 10 g of melamine was heated at 600 °C for 2 hours under nitrogen protection to obtain a yellow powder C 3 N 4 ;

[0038] 2) put C 3 N 4 The powder was refluxed in concentrated nitric acid for 24 hours, centrifuged and washed with distilled water;

[0039] 3) Hydrothermal reaction at 200°C for 12 hours;

[0040] 4) Centrifuge and wash with distilled water;

[0041] 5) The obtained white precipitate was sonicated in distilled water for 4 hours;

[0042] 6) Suction filtration with a 0.22 micron water phase filter membrane, and the filtrate is an aqueous solution of carbonized nitrogen quantum dots.

[0043] The carbonized nitrogen quantum dot aqueous solution is used as fluorescent ink for product anti-counterfeiting, important document protection and information encryption.

[0044] The specific steps of the fluorescent information encryption and decryption meth...

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Abstract

The invention discloses nitrogen carbide quantum dot fluorescence ink. By virtue of a hydrothermal synthesis method, a colorless and transparent nitrogen solution with strong fluorescence characteristics is prepared, and nitrogen carbide quantum dots of the water solution are uniform in shape and controllable in size; a maximal fluorescence-emission peak can be detected at 368 nanometers by virtue of excitation of a 250-nanometer wavelength, and most emission peaks are projected to invisible regions; when the nitrogen carbide quantum dot fluorescence ink is applied to encrypted storage protection of fluorescence information, the encrypted information cannot be read by virtue of ultraviolet color development, and fluorescence signals can be converted into readable information by virtue of a specific instrument. Compared with a traditional method, the method has the advantages that read equipment is relatively specific, and the information encryption is relatively strong.

Description

technical field [0001] The invention belongs to the field of nano fluorescent materials, in particular to a nitrogen carbide quantum dot fluorescent ink. Background technique [0002] In recent years, nano-fluorescent materials have been widely used as fluorescent inks in product anti-counterfeiting, important document protection, and information encryption. Among the published patents related to nanomaterials used as fluorescent inks, carbon nanomaterials (201310036988.2, 201410479599.1), nitrogen-doped carbon nanomaterials (201310036988.2), up-conversion fluorescent nanomaterials (201410718694.2), transition metal nanomaterials (201210168204.7), etc. Their nano-fluorescence emission spectrum mainly falls in the visible region, so when these materials are used as fluorescent inks to transmit information and anti-counterfeiting, the information is invisible under ordinary light, and can only be read in a specific ultraviolet environment. Information, so as to achieve the ef...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D11/50
CPCC09D11/50
Inventor 郭良洽宋志平
Owner FUZHOU UNIV
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