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A kind of cadmium telluride quantum dot-silk protein and hydrotalcite composite luminescent film and preparation method thereof

A technology of cadmium telluride quantum dots and silk protein, which is applied in the field of cadmium telluride quantum dots-silk protein and hydrotalcite composite luminescent film and its preparation, can solve the problems that there is no luminescent film, and achieve the improvement of fluorescence intensity and stability , the preparation method is simple, the effect of precise control of film thickness

Active Publication Date: 2021-03-26
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] There is no research report on the co-assembly of silk protein and quantum dots on hydrotalcite to form a luminescent film in this field

Method used

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  • A kind of cadmium telluride quantum dot-silk protein and hydrotalcite composite luminescent film and preparation method thereof
  • A kind of cadmium telluride quantum dot-silk protein and hydrotalcite composite luminescent film and preparation method thereof
  • A kind of cadmium telluride quantum dot-silk protein and hydrotalcite composite luminescent film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Cadmium telluride quantum dots-silk protein and hydrotalcite composite luminescent film, the steps are as follows:

[0033] 1. Preparation of magnesium aluminum nitrate hydrotalcite by ion exchange method

[0034] 1) 0.09mol of solid powder Mg(NO 3 ) 2 ·6H 2 O and 0.045mol of solid powder Al(NO 3 ) 3 9H 2 O and 0.54mol solid urea were dissolved in 300ml to remove CO 2 In deionized water, stirred and transferred to a polytetrafluoroethylene reactor, crystallized at 120°C for 12 hours, then taken out, centrifugally washed with deionized water until neutral, and fully dried at 60°C to obtain magnesium aluminum carbonate hydrotalcite.

[0035] 2) Take the above-mentioned carbonate hydrotalcite 0.625g and solid NaNO 3 127g dissolved in 500ml to remove CO 2Add 0.25ml of concentrated nitric acid after uniform dispersion in deionized water, under the protection of nitrogen atmosphere, mechanically stir at room temperature for 24 hours, centrifugally wash with deionized...

Embodiment 2

[0050] Cadmium telluride quantum dots-silk protein and hydrotalcite composite luminescent film, the steps are as follows:

[0051] 1. Same as embodiment 1

[0052] 2. Same as embodiment 1

[0053] 3. Same as embodiment 1

[0054] 4. Transformation of β-sheet silk protein structure

[0055] Take the C solution of silk protein prepared in Example 1, add 70% volume concentration of ethanol solvent for treatment, the volume ratio of C solution of silk protein and ethanol solvent is 3:7, and the silk protein solution of random curl can be transformed into Form the secondary structure of β sheet, denoted as solution D;

[0056] 5. Preparation of cadmium telluride quantum dots-silk protein and hydrotalcite composite luminescent film

[0057] 1) Soak the quartz plate in concentrated sulfuric acid and hydrogen peroxide with a volume ratio of 7:3 for 30 minutes, then alternately wash twice with ethanol and ultrapure water, and then alternately soak and pre-assemble with PDDA and PSS...

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Abstract

The invention discloses a composite luminescent film prepared by assembling both silk protein and cadmium telluride quantum dots onto hydrotalcite, and a preparation method of the composite luminescent film, belonging to the field of biological / inorganic composite luminescent materials. According to the method, a cadmium telluride quantum dot solution and a prepared silk protein water solution are mixed at first, and then the mixed solution and hydrotalcite nano sheets peeled in an organic solvent are assembled alternately by using a layer-by-layer assembly method, so as to prepare orderly-structured composite luminescent films with different layer numbers. The cadmium telluride quantum dots and silk protein biological molecules are successfully fixed and arranged in order by using modification of carboxyl groups of the quantum dots and interaction of hydrogen bonds formed between amino groups of the silk protein as well as the rigid structure of a hydrotalcite board and a two-dimensional confinement effect, the luminescent stability of the cadmium telluride quantum dots is improved, and fluorescence quenching of the cadmium telluride quantum dots caused by molecule aggregation is lowered.

Description

technical field [0001] The invention belongs to the technical field of preparation of biological / inorganic composite materials, and in particular provides a cadmium telluride quantum dot-silk protein and hydrotalcite composite luminescent film and a preparation method thereof. Background technique [0002] Silk protein is the main body of silk, accounting for about 70% to 80% of the mass of silk. It is a natural biological macromolecule without physiological activity. It is connected by hydrogenation bonds, and its molecular weight is generally considered to be about 3.7*10 5 . . The secondary structure of silk protein can be changed. Among various methods to change the conformation of silk protein, treatment with alcohol is the most direct, simple and effective method, which has been deeply studied and widely used. Compared with other natural polymers, silk protein has obvious advantages. Studies have shown that it has good biocompatibility, non-toxic, non-polluting, non...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/88
CPCC09K11/883
Inventor 陆军李玲
Owner BEIJING UNIV OF CHEM TECH
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