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A kind of preparation method of layered stack photoluminescence zif-l film structure

A technology of ZIF-L and photoluminescence, which is applied in the field of materials, can solve complex problems and achieve the effects of low equipment requirements, low cost, good repeatability and stability

Active Publication Date: 2022-01-04
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Regarding the preparation of ZIF-L, the zinc source generally used is zinc nitrate, and the preparation of good-quality ZIF-L films is usually complicated. Although there have been many studies on the performance of ZIF-L materials, more are The most important thing is the research on ZIF-L in adsorption, catalysis, etc., and there is no research on the photoluminescence phenomenon of layered closely stacked ZIF-L thin films.

Method used

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  • A kind of preparation method of layered stack photoluminescence zif-l film structure
  • A kind of preparation method of layered stack photoluminescence zif-l film structure
  • A kind of preparation method of layered stack photoluminescence zif-l film structure

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Embodiment 1

[0031] (1) Preparation of ZIF-L sol (the molar ratio of reactants is 1:1 and the ratio of 2-methylimidazole to solvent is 0.025mol:5ml): Weigh 5.4878g of zinc acetate dihydrate and 2.0525g of 2-methylimidazole respectively Imidazole is placed in a small glass bottle equipped with a magnet, then 5ml of methanol is added to the glass bottle, and the glass bottle is placed on a magnetic stirrer to mix and stir for 30 minutes to obtain ZIF- L-sol.

[0032] (2) Cleaning of thin film substrate: In order to avoid the weak luminescence of the substrate from affecting the photoluminescence performance of the ZIF-L film, the substrate used in the present invention is sapphire. The specific cleaning step is to use deionized water and alcohol solution to sonicate the sapphire for 20 minutes.

[0033] (3) Spin-coating coating on the substrate: place the sapphire substrate on the platform of the spin coating apparatus, and evenly coat the ZIF-L sol on the substrate with a dropper, and set ...

Embodiment 2

[0037] (1) Preparation of ZIF-L sol (the molar ratio of reactants is 1:2 and the ratio of 2-methylimidazole to solvent is 0.050mol:30ml): Weigh 5.4878g of zinc acetate dihydrate and 4.1050g of 2-methylimidazole respectively Kimidazole is placed in a small glass bottle equipped with a magnet, then 15ml of methanol is added to the glass bottle, and the glass bottle is placed on a magnetic stirrer to mix and stir for 60 minutes to obtain a concentration of 1.67mol / L. ZIF-L sol.

[0038] (2) Cleaning of thin film substrate: In order to avoid the weak luminescence of the substrate from affecting the photoluminescence performance of the ZIF-L film, the substrate used in the present invention is a standard grade glass slide. The specific cleaning step is to sonicate the glass slide for 40 minutes with deionized water and alcohol solution in sequence.

[0039] (3) Spin-coating coating on the substrate: place the glass slide substrate on the platform of the spin coating apparatus, use...

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Abstract

The invention discloses a method for preparing a layered stacked photoluminescent ZIF-L film structure, comprising the following steps: mixing and dissolving zinc acetate dihydrate and 2-methylimidazole in a solvent to prepare a ZIF-L sol; film substrate Spin-coat the ZIF‑L sol on the substrate to form a film; heat-treat the obtained wet film on a heating plate at 60‑80 °C for 1‑3 hours, then slowly raise the temperature of the heating plate to 135‑200 °C and keep it warm until photoinduced glow phenomenon. The ZIF-L film prepared by the present invention has a two-dimensional layered closely stacked structure and has photoluminescence properties; the film thickness and crystallinity can be adjusted by changing the concentration of the sol and the type of substrate, thereby regulating the photoluminescence of ZIF-L. Luminescence performance; annealing at different temperatures can adjust the photoluminescence color of ZIF‑L thin film from blue to orange red; low equipment requirements, low cost, good film quality and luminescence performance.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a method for preparing a layered stacked photoluminescence ZIF-L film structure. Background technique [0002] Zeolitic imidazole frameworks (ZIFs) are a branch of metal-organic frameworks (MOFs), which are composed of tetrahedral metal ion nodes and imidazole ligands. ZIF-L is a two-dimensional structure composed of metal ions Zn 2+ Composed of 2-methylimidazole (Hmim), there are leaf-like, rod-like and sheet-like hierarchical morphology, etc. 2 It has high adsorption and selectivity. At the same time, ZIF-L has been used as an adsorbent to remove harmful substances such as dyes, aromatics, arsenic and heavy metals. It can also be used in catalysts, drug delivery, sensors and gas storage. [0003] Regarding the preparation of ZIF-L, the zinc source generally used is zinc nitrate, and the preparation of good-quality ZIF-L films is usually complicated. Although the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08G83/00C09K11/06C08L87/00
CPCC08J5/18C08G83/008C09K11/06C09K2211/188C08J2387/00
Inventor 田守勤刘秋芬杨鑫伟赵修建
Owner WUHAN UNIV OF TECH
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