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Detection method for omethoate on basis of CsPbBr3 perovskite quantum dot-molecular imprinting fluorescence sensor

A fluorescent sensor, molecular imprinting technology, applied in the field of analytical chemistry to achieve high selectivity

Active Publication Date: 2018-11-13
SOUTH CHINA NORMAL UNIVERSITY
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Problems solved by technology

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

Method used

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  • Detection method for omethoate on basis of CsPbBr3 perovskite quantum dot-molecular imprinting fluorescence sensor
  • Detection method for omethoate on basis of CsPbBr3 perovskite quantum dot-molecular imprinting fluorescence sensor
  • Detection method for omethoate on basis of CsPbBr3 perovskite quantum dot-molecular imprinting fluorescence sensor

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Embodiment 1

[0062] A CsPbBr-based 3 The detection method of the omethoate of perovskite quantum dot-molecularly imprinted fluorescent sensor comprises the following steps:

[0063] S1: CsPbBr 3 Preparation of Perovskite Quantum Dots-Molecularly Imprinted Fluorescence Sensor

[0064] (1) Preparation of APTES-capped CsPbBr 3 Perovskite Quantum Dots

[0065] 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. for 1 hour under vacuum, then heating to 150° C. under the condition of feeding nitrogen gas, and keeping the temperature for 2 hours until the solution is clear to obtain a cesium oleate solution;

[0066] 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%, O...

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Abstract

The invention provides a detection method for omethoate on the basis of a CsPbBr3 perovskite quantum dot-molecular imprinting fluorescence sensor. The detection method comprises the following steps: S1: preparing the CsPbBr3 perovskite quantum dot-molecular imprinting fluorescence sensor; S2, drawing a standard work curve of fluorescence quenching intensity-omethoate concentration, and working outa working equation; S3, measuring the content of omethoate in a sample. The detection method provided by the invention achieves high selectivity and high sensitivity detection to the omethoate by using an APTES (aminopropyltriethoxysilane) blocked CsPbBr3 quantum dot as a signal element, and then wrapping with the CsPbBr3 perovskite quantum dot-molecular imprinting fluorescence sensor with a sensitive omethoate recognition function on a molecularly imprinted polymer layer. The detection method provided by the invention has a linear detection range of 50-400 ng / mL, a linearly dependent coefficient of 0.997, a limit of detection of 18.8ng / mL and relative standard deviation of 1.7 percent (RSD).

Description

technical field [0001] The invention belongs to the field of analytical chemistry, in particular to a CsPbBr-based 3 Perovskite quantum dot-molecularly imprinted fluorescent sensor for the detection of omethoate. 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 is highly sensitive but 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, supercritical fluid extracti...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64
CPCG01N21/643G01N2021/6432
Inventor 梁勇郭慢丽
Owner SOUTH CHINA NORMAL UNIVERSITY
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