Preparation method and application of high-stability perovskite quantum dot fluorescence sensor

A fluorescent sensor and high-stability technology, applied in chemical instruments and methods, fluorescence/phosphorescence, and resistance to media-borne diseases, etc., can solve problems such as allergic reactions, resistance genes, and ecological environment damage, and achieve high fluorescence quantum The effects of yield, uniform particle size, and stable fluorescence properties

Active Publication Date: 2020-08-11
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

After tetracycline antibiotics enter the soil or water environment, they may cause bacteria and microorganisms in the soil or water to perish or produce resistance genes, leading to the destruction of the ecological environment; at the same time, after entering the human body through bioaccumulation, it will cause harm to the human body. Serious hazards, including yellowing teeth, allergic reactions, liver damage, and even gastrointestinal disturbances
These three documents all use new perovskite quantum dots to construct a fluorescent sensor system in the oil phase, but there is no report on the construction of a fluorescent tetracycline sensor system in the alcohol phase.

Method used

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  • Preparation method and application of high-stability perovskite quantum dot fluorescence sensor
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  • Preparation method and application of high-stability perovskite quantum dot fluorescence sensor

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Embodiment 1

[0037] This embodiment includes the following steps:

[0038]Step 1. Add 0.4mmol lead bromide and 0.4mmol cesium bromide to 10mL of N,N-dimethylformamide (DMF), stir until completely dissolved to obtain a precursor solution;

[0039] Step 2. Add 1.0mL oleic acid and 0.15mL APTES ligand to the precursor solution obtained in step 1, stir and mix evenly to obtain a mixed solution;

[0040] Step 3. Inject 1.0 mL of the mixed solution obtained in Step 2 into 10 mL of dichloromethane being stirred, and continue stirring for 30 minutes to obtain a mixed product;

[0041] Step 4, using n-hexane and dichloromethane alternately to wash and centrifuge the mixed product obtained in step 3 at a speed of 10,000 rpm, and the obtained precipitate is a perovskite quantum dot fluorescence sensor.

[0042] figure 2 is the fluorescence performance spectrum of APTES@IPQDs prepared in this example, from figure 2 It can be seen that the APTES@IPQDs prepared in this example has an obvious charac...

Embodiment 2

[0046] This embodiment includes the following steps:

[0047] Step 1. Add 0.4mmol lead bromide and 0.4mmol cesium bromide to 10mL of dimethyl sulfoxide (DMSO), stir until completely dissolved to obtain a precursor solution;

[0048] Step 2. Add 1.0mL oleic acid and 0.10mL APTES ligand to the precursor solution obtained in step 1, stir and mix evenly to obtain a mixed solution;

[0049] Step 3. Inject 1.0 mL of the mixed solution obtained in Step 2 into 10 mL of dichloromethane being stirred, and continue stirring for 30 minutes to obtain a mixed product;

[0050] Step 4: Wash and centrifuge the mixed product obtained in Step 3 alternately with n-hexane and methylene chloride at a speed of 12000 rpm, and the obtained precipitate is a perovskite quantum dot fluorescent sensor.

Embodiment 3

[0052] This embodiment includes the following steps:

[0053] Step 1. Add 0.4mmol lead bromide and 0.4mmol cesium bromide to 10mL of N,N-dimethylformamide (DMF), stir until completely dissolved to obtain a precursor solution;

[0054] Step 2. Add 1.0mL oleic acid and 0.20mL APTES ligand to the precursor solution obtained in step 1, stir and mix evenly to obtain a mixed solution;

[0055] Step 3. Inject 1.0 mL of the mixed solution obtained in Step 2 into 10 mL of dichloromethane being stirred, and continue stirring for 30 minutes to obtain a mixed product;

[0056] Step 4: Wash and centrifuge the mixed product obtained in Step 3 alternately with n-hexane and methylene chloride at a speed of 8000 rpm, and the obtained precipitate is a perovskite quantum dot fluorescent sensor.

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Abstract

The invention discloses a preparation method of high-stability perovskite quantum dots, which comprises the following step: preparing a perovskite quantum dot fluorescence sensor by taking lead bromide and cesium bromide as precursors and taking 3-aminopropyltriethoxysilane and oleic acid as ligands at room temperature. The invention also discloses an application of the perovskite quantum dot fluorescence sensor in alcohol-phase tetracycline detection. According to the invention, a supersaturated recrystallization method at room temperature is adopted, the perovskite quantum dot fluorescence sensor is obtained by coating the surface of perovskite quantum dots with a silicon layer with 3-aminopropyltriethoxysilane for modification, oxidation inactivation of the perovskite quantum dots is avoided, and the stability of the perovskite quantum dots is improved, so that the perovskite quantum dot fluorescence sensor is stably dispersed in a high-polarity solvent. Amino groups on the surfaceof the perovskite quantum dot fluorescence sensor and tetracycline molecules are subjected to specific recognition and combination, fluorescence detection of tetracycline in an alcohol phase is achieved, and the perovskite quantum dot fluorescence sensor has the advantages of being high in selectivity and sensitivity.

Description

technical field [0001] The invention belongs to the technical field of preparation of environmental functional materials, and in particular relates to a preparation method and application of a high-stability perovskite quantum dot fluorescence sensor. Background technique [0002] Tetracycline antibiotics are a class of broad-spectrum antibiotics discovered in the 1940s with a phenanthane nucleus, which are widely used in infections caused by Gram-positive and negative bacteria, intracellular mycoplasma, chlamydia, and rickettsia. Due to its high quality and low price, good stability, low concentration to promote crop growth, and high concentration to quickly sterilize and other characteristics, it has been used more and more frequently in agriculture and animal husbandry. After tetracycline antibiotics enter the soil or water environment, they may cause bacteria and microorganisms in the soil or water to perish or produce resistance genes, leading to the destruction of the ...

Claims

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Application Information

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IPC IPC(8): C09K11/66C09K11/02B82Y20/00B82Y30/00B82Y40/00G01N21/64
CPCC09K11/665C09K11/02B82Y20/00B82Y30/00B82Y40/00G01N21/6428G01N21/643G01N2021/6432Y02A50/30
Inventor 卫潇王通陈贝秦昉张珅
Owner CHANGAN UNIV
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