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A covalent organic framework-based metamaterial and its application in optical devices

A technology of covalent organic frameworks and metamaterials, applied in the field of optical metamaterials, can solve the problems of self-assembled metamaterials lacking nanopore structures, and achieve precise control and response, high mechanical strength and elastic deformation, and synthesis process easy effect

Active Publication Date: 2022-07-15
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of this, the present invention provides a metamaterial based on a covalent organic framework and its application in optical devices to solve the existing problem of lacking self-assembled metamaterials with nanopore structures

Method used

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  • A covalent organic framework-based metamaterial and its application in optical devices
  • A covalent organic framework-based metamaterial and its application in optical devices
  • A covalent organic framework-based metamaterial and its application in optical devices

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Effect test

Embodiment 1

[0025] A covalent organic framework metamaterial MM-1 was synthesized using tris(4-aminophenyl)amine and tris(4-aldehyde phenyl)amine as monomers. The specific process is as follows: under the assistance of ultrasound, 58.1 mg of tri( 4-Aminophenyl)amine and 65.9 mg of tris(4-aldophenyl)amine were dissolved in 40 mL of dioxane / mesitylene (2 / 3, v / v) to obtain a monomer solution. Add 364.3 μL of benzaldehyde and 326.4 μL of aniline to the monomer solution, dissolve 12 mg of scandium trifluoromethanesulfonate in 0.6 mL of dioxane / mesitylene (2 / 1, v / v), add the monomer solution A reaction solution was prepared in the medium, and the reaction was started at 25°C. After 3 days, the precipitate was collected by filtration and washed with dioxane / mesitylene (2 / 3, v / v) and n-hexane. The product was dried in a fume hood overnight and in a vacuum oven at 60 °C for 1 day to obtain metamaterial MM-1.

[0026] The metamaterial MM-1 has features such as figure 1 The sheet-like structures ...

Embodiment 2

[0028] Using the method of Example 1, 1,3,5-tris(4-aminophenyl)benzene and tris(4-aldehyde phenyl)amine are used as monomers to synthesize metamaterial MM-2, which has a sheet-like structure , composed of covalent organic framework nanosheets oriented arrangement, the average length of the nanosheets is 565nm, the thickness is 27nm, the arrangement spacing is 17nm, the Hermans orientation factor is 1, the existing lamellar structures are different in size, and the size of the lamellae is obtained by statistics. The structures have a length of 15-50 μm, a width of 10-50 μm, and an average thickness of 820 nm. The BET specific surface area of ​​metamaterial MM-2 is 1502m 2 / g, the crystallinity was 83%. The metamaterial still maintains the original sheet-like structure and nanosheet orientation arrangement after carbonization at 600 °C. Taking 0.4g of metamaterial MM-2 and cold pressing at 1MPa can be formed into a block material. The block material has a diameter of 13mm, a t...

Embodiment 3

[0030] Using the method of Example 1, tris(4-aminophenyl)amine and 1,3,5-tris(4-aldehyde phenyl)benzene are used as monomers to synthesize metamaterial MM-3, which has a sheet-like structure , composed of covalent organic framework nanosheets oriented arrangement, the average length of the nanosheets is 60nm, the thickness is 12nm, the arrangement spacing is 7nm, the Hermans orientation factor is 0.855, and the size of the flaky structure exists statistically, and its length is 1-20μm, The width is 1-15 μm, and the average thickness is 20 nm. The BET specific surface area of ​​metamaterial MM-4 is 930m 2 / g, the crystallinity was 71%. After carbonization at 1200 °C, the metamaterial still maintains the original sheet-like structure and the parallel arrangement of nanosheets. Taking 0.4g of metamaterial MM-3 and cold pressing at 30MPa, it can be formed into a block material. The block material has a diameter of 13mm, a thickness of 3mm, a compressive modulus of 410MPa, a comp...

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Abstract

The invention provides a metamaterial based on a covalent organic framework and its application in optical devices, the metamaterial is composed of a covalent organic framework; the metamaterial is a sheet-like structure or a hollow spherical structure, and consists of a plurality of nanosheets Orientation arrangement. The metamaterial based on the covalent organic framework provided by the present invention has nano-channels, which can adsorb chemical substances in liquid or gas medium, and change the optical response of the metamaterial to realize substance detection; through the selection of synthesis monomers and synthesis conditions, The size and arrangement of nanosheets can be flexibly adjusted, thereby adjusting the overall structure and optical response of metamaterials. The metamaterial can be applied in the field of optical devices, such as optical sensors, gratings, anti-counterfeiting signs, etc.

Description

technical field [0001] The invention relates to the field of optical metamaterials, in particular to a metamaterial based on a covalent organic framework and its application in optical devices. Background technique [0002] Optical metamaterials are materials composed of subwavelength-scale unit structures or superatoms with specific electromagnetic properties. Based on their geometry, size, surface permittivity, and assembly structure, they have the ability to control and respond to electromagnetic waves. Traditional metamaterials are metasurfaces fabricated by top-down methods, such as electron beam lithography or focused ion beam milling, which are expensive and inefficient. The bottom-up self-assembly strategy can produce complex superatoms or superstructures on a large scale, but the optical metamaterials prepared by existing self-assembly methods are mostly dense solid materials, such as nanoresonators formed by stacking silver nanoparticles, The perfect absorber of v...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G83/00G02B1/04B82Y30/00B82Y40/00
CPCC08G83/00G02B1/04B82Y30/00B82Y40/00
Inventor 刘平伟李炜王崧王文俊
Owner ZHEJIANG UNIV
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