cspbbr for detection of omethoate 3 Perovskite quantum dot-molecularly imprinted fluorescent sensor and its preparation method

A technology of fluorescent sensor and omethoate, which is applied in the field of analytical chemistry to achieve the effects of high yield, high efficiency and high sensitivity

Active Publication Date: 2021-01-26
SOUTH CHINA NORMAL UNIVERSITY
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Problems solved by technology

Although CsPbBr 3 Perovskite quantum dots have high photoluminescence (PL) quantum yields (QYs), CsPbBr 3 Stability of perovskite quantum dots in water and oxygen remains a major challenge

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  • cspbbr for detection of omethoate <sub>3</sub> Perovskite quantum dot-molecularly imprinted fluorescent sensor and its preparation method
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  • cspbbr for detection of omethoate <sub>3</sub> Perovskite quantum dot-molecularly imprinted fluorescent sensor and its preparation method

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preparation example Construction

[0057] Such as figure 1 Shown, the invention provides a kind of CsPbBr for detecting omethoate 3 A method for preparing a perovskite quantum dot-molecularly imprinted fluorescent sensor, comprising the following steps:

[0058] S1: Preparation of APTES-capped CsPbBr 3 Perovskite Quantum Dots

[0059] Add 3-aminopropyltriethoxysilane (APTES) to cesium carbonate (Cs 2 CO 3 ), Octadecene (ODE), PbBr 2 , oleic acid (0A) and oleylamine (OAm) mixture, at a temperature of 20 ° C, a humidity of 40%, under air conditions, stirred for 3 hours, hydrolyzed, purified, and prepared APTES-capped CsPbBr 3 Perovskite quantum dots;

[0060] S2: Preparation of CsPbBr 3 Perovskite Quantum Dots-Molecularly Imprinted Polymers

[0061] Template molecule omethoate (OMT), octadecene, APTES-capped CsPbBr obtained in step S1 3 The perovskite quantum dots and the remaining 3-aminopropyltriethoxysilane (APTES) from the reaction in step S1 were mixed and stirred for 30 minutes, then a crosslinking...

Embodiment 1

[0068] (1) Preparation of APTES-capped CsPbBr 3 Perovskite Quantum Dots

[0069] 1) Join 0.32g cesium carbonate, 1ml oleic acid (90%, OA), 12ml octadecene (90%, ODE) in the 50ml three-neck round bottom flask, vacuum degas 10 minutes on Schlenk line, in Heating to 120°C under vacuum conditions for 1 hour, then heating to 150°C under the condition of feeding nitrogen gas, and constant temperature for 2 hours until the solution is clear to obtain a cesium oleate solution;

[0070] 2) Mix 10ml octadecene (90%, ODE) and 0.376mmol PbBr 2 Load it into a 50ml three-necked round-bottomed flask, degas it under vacuum for 10 minutes, and dry it under vacuum for 1 hour at a temperature of 120°C. , 100 μl oleylamine (80%-90%, OAm) and 1ml 3-aminopropyltriethoxysilane (APTES) were slowly added to the flask, and the solution was clarified and heated to 160°C;

[0071] 3) Preheat the cesium oleate solution prepared in step 1) to 100°C, quickly inject 1ml of the preheated cesium oleate soluti...

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Abstract

The invention relates to a preparation method of a CsPbBr3 perovskite quantum dot-molecular imprinting fluorescence sensor for detecting omethoate. The method comprises the following steps: S1: preparation of APTES-terminated CsPbBr3 perovskite quantum dots; S2: preparation of a CsPbBr3 perovskite quantum dots-molecular imprinting polymer; and S3: elution of template molecule omethoate. The present invention also provides the CsPbBr3 perovskite quantum dot-molecular imprinting fluorescence sensor for detecting omethoate, which is prepared according to the above preparation method. The preparation method provided by the invention has mild reaction conditions, fast reaction speed and high yield; and the CsPbBr3 perovskite quantum dot-molecular imprinting fluorescence sensor provided by the invention has characteristics of high sensitivity and specific recognition for omethoate, a linear detection range is 50-400 ng / mL, a linear correlation coefficient is 0.997, the detection limit is 18.8 ng / mL, and the detection precision is 1.7% (RSD).

Description

technical field [0001] The invention belongs to the field of analytical chemistry, in particular to a CsPbBr for detecting omethoate 3 Perovskite quantum dot-molecularly imprinted fluorescent sensor and its preparation method. Background technique [0002] Omethoate detection is a hotspot in the research and development of food safety at home and abroad. At present, gas chromatography, liquid chromatography, immunoassay, gas chromatography-mass spectrometry (GC-MS) and liquid chromatography-mass spectrometry (LC-MS) are mainly used. method. Chromatography-mass spectrometry has high detection sensitivity but is expensive. Chromatography has a high detection limit and cannot meet the actual needs of trace pesticide residues and export trade detection, so enrichment is usually required before analysis. The pretreatment methods currently used mainly include solid-phase extraction, liquid-liquid extraction, matrix-dispersed solid-phase extraction, solid-phase microextraction, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/28C08G77/26G01N21/64C08L83/08
CPCC08G77/26C08J9/28C08J2383/08G01N21/6428
Inventor 梁勇郭慢丽
Owner SOUTH CHINA NORMAL UNIVERSITY
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