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Metal organic framework ZIF-8 photonic crystal and preparation method and application thereof

A metal-organic framework, ZIF-8 technology, applied in crystal growth, chemical instruments and methods, optics, etc., can solve problems such as single structure and limited functionalization of photonic crystals

Active Publication Date: 2022-01-28
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003]At present, spherical colloidal particles are usually used to assemble photonic crystals, and they can only be assembled into face centered cubic (FCC), hexagonal close packing (hcp), and random close packing (rcp) three crystal structures, single structure
Besides, most of the currently used colloidal particle materials are limited to polymethylmethacrylate, polystyrene, and silica, which largely limits the functionalization of photonic crystals.

Method used

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  • Metal organic framework ZIF-8 photonic crystal and preparation method and application thereof
  • Metal organic framework ZIF-8 photonic crystal and preparation method and application thereof
  • Metal organic framework ZIF-8 photonic crystal and preparation method and application thereof

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Embodiment 1

[0038] This embodiment is the preparation of ZIF-8 photonic crystal, and the specific preparation steps are as follows:

[0039] 1. Dissolving zinc acetate in water to obtain a concentration of 0.32 moles per liter of zinc acetate aqueous solution.

[0040] 2. Dissolve 2-methylimidazole and cetyltrimethylammonium bromide in water to obtain a mixed aqueous solution of the two, wherein the concentration of 2-methylimidazole is 2.72 moles per liter, cetyltrimethylammonium The concentration of ammonium bromide was 1.10 mmol per liter.

[0041] 3. Under stirring, mix 5ml of zinc acetate aqueous solution with 5ml of 2-methylimidazole and cetyltrimethylammonium bromide, and let it react at normal temperature and pressure for 2 hours, and the solution becomes cloudy.

[0042] 4. After the reaction time is over, pour the above suspension into a centrifuge tube, pour out the supernatant after centrifugation, and add water to disperse the precipitate. This process was repeated three ti...

Embodiment 2

[0049] This embodiment is the preparation of ZIF-8 photonic crystal

[0050] The difference between this embodiment and embodiment 1 is that the concentration of cetyltrimethylammonium bromide in step 2 is replaced by 0.80 mmol per liter from 1.10 mmol per liter, and other conditions remain unchanged.

[0051] The average particle diameter of the ZIF-8 colloidal particles in the ZIF-8 photonic crystal obtained in this embodiment is 450 nm. ZIF-8 colloidal particles are cubic, and the assembled photonic crystals are simple cubic crystals.

[0052] Figure 7 Be the SEM figure of the present embodiment ZIF-8 photonic crystal, Figure 8 For the physical figure of the present embodiment ZIF-8 photonic crystal, Figure 9 It is the reflection spectrum diagram of the ZIF-8 photonic crystal of the present embodiment. from Figure 7-9 It can be seen that the secondary diffraction peak of the ZIF-8 photonic crystal in this embodiment is 500 nm, which makes the ZIF-8 photonic crystal...

Embodiment 3

[0054] This embodiment is the preparation of ZIF-8 photonic crystal

[0055] The difference between this embodiment and embodiment 1 is that the reaction time of step 2 is extended to 4 hours.

[0056] The average particle diameter of the ZIF-8 colloidal particles in the ZIF-8 photonic crystal obtained in this embodiment is 260 nm. ZIF-8 colloidal particles are cubic, and the assembled photonic crystals are simple cubic crystals.

[0057] Figure 10 Be the SEM figure of the present embodiment ZIF-8 photonic crystal, Figure 11 For the physical figure of the present embodiment ZIF-8 photonic crystal, Figure 12 It is the reflection spectrum diagram of the ZIF-8 photonic crystal of the present embodiment. from Figure 10-12 It can be seen that the first-order diffraction peak of the ZIF-8 photonic crystal in this embodiment is 630 nm, which makes the ZIF-8 photonic crystal red.

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Abstract

The invention relates to the technical field of photonic crystals, in particular to a metal organic framework ZIF-8 photonic crystal and a preparation method and application thereof. The invention discloses a preparation method of a metal organic framework ZIF-8 photonic crystal, which comprises the following steps: by taking zinc acetate and dimethylimidazole as precursors, controlling crystal face growth in the metal organic framework ZIF-8 process by using a surfactant to obtain cubic ZIF-8 colloidal particles, and assembling for the first time to obtain the photonic crystal with a simple cubic crystal form. The photonic crystal has bright and lasting structural color, the structural color can be derived from first-order diffraction or second-order diffraction of the photonic crystal, and the photonic crystal better maintains the crystal structure, the specific surface area and the pore channel structure of ZIF-8.

Description

technical field [0001] The invention relates to the technical field of photonic crystals, in particular to a metal-organic framework ZIF-8 photonic crystal and a preparation method and application thereof. Background technique [0002] Colloidal particles with uniform size can be crystallized under certain conditions to obtain colloidal crystals. Such colloidal crystals have special optical properties, so they are called photonic crystals. As a dielectric material, photonic crystals have a periodically changing refractive index and a unique photonic band gap, which can inhibit certain wavelengths of light from passing through photonic crystals. When the wavelength is in the visible range, the existence of the photonic band gap makes photonic crystals have bright structural colors. Thanks to this, photonic crystals have a wide range of potential applications in sensors, displays, bio-encoding, anti-counterfeiting, and separation and optical devices. Therefore, photonic crys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B7/14C30B28/04C30B29/54G02B1/00
CPCC30B7/14C30B28/04C30B29/54G02B1/005
Inventor 卜冬蕾萧雪萍陈尚贤黄少铭
Owner GUANGDONG UNIV OF TECH