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Fluorescent probe molecules for pH detection, fluorescent thin film sensors, preparation methods and applications thereof

A thin-film sensor and fluorescent probe technology, applied in fluorescence/phosphorescence, material analysis through optical means, instruments, etc., can solve problems such as loss, digestion or quenching, and prone to errors

Inactive Publication Date: 2020-07-07
CHONGQING THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the fact that the pH indicator in the film sensor will be lost, digested or quenched under the influence of external environmental factors, the indicated absorbance or fluorescence sensing signal intensity deviates from the standard curve, which is prone to errors

Method used

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  • Fluorescent probe molecules for pH detection, fluorescent thin film sensors, preparation methods and applications thereof
  • Fluorescent probe molecules for pH detection, fluorescent thin film sensors, preparation methods and applications thereof
  • Fluorescent probe molecules for pH detection, fluorescent thin film sensors, preparation methods and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1 synthetic pH fluorescent probe A

[0025] To synthesize pH fluorescent probe A, follow the steps below:

[0026] 1) Use a 50-milliliter single-mouth bottle as a reaction bottle, inject 1.59 grams of 6-hydroxyquinaldine, 1.63 grams of anisaldehyde and 6 milliliters of acetic anhydride, and heat the resulting mixture to reflux for 1 hour under stirring.

[0027] 2) The solvent in the reaction mixture was evaporated, and the heating was stopped when about 2 milliliters of residue remained in the reaction bottle, and 5 milliliters of 40% sodium hydroxide solution was added thereto to obtain a mixed lye.

[0028] 3) The resulting mixed lye was stirred at 90 degrees Celsius for 10 minutes and then poured into 50 ml of tap water to obtain a dilute lye.

[0029] 4) Add 10% dilute hydrochloric acid dropwise to the obtained dilute alkali solution to adjust the pH value to between 7 and 8 to obtain a neutral dilute solution. The neutral dilute solution was extracted...

Embodiment 2

[0032] Example 2 Preparation of a fluorescent thin film sensor based on the novel pH probe molecule A

[0033] Follow the steps below: put 5.0 mg of pH fluorescent probe A in 250 ml of 10% Nafion solution and mix evenly to form a casting solution. Spin-coat the casting solution onto a glass substrate and place it in a solvent evaporation chamber. Heating to 100-120° C. for 0.5-12 hours, and after removing the solvent, a fluorescent thin film sensor based on the novel pH probe molecule A is formed. The 10% Nafion solution is prepared by the method reported by Wang Shouxu et al. The solvent used is DMF. The reference is: Preparation of special Nafion solution and its application research in PEMFC, Wang Shouxu et al., "Journal of Electronic Science and Technology University" 2006, volume 35 , No. 5, pp. 826-828.

[0034] The detector used to measure the luminescent signal of the carrier on-line can be a fiber optic spectrometer. Weihai Optical Instrument (Shanghai) Co., Ltd. pr...

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Abstract

The invention discloses a fluorescent probe molecule for pH (potential of hydrogen) detection, which is 2-(4-methoxystyrene) quinoline-6-phenol. The invention further discloses a preparation method ofthe fluorescent probe molecule. The invention further discloses a fluorescent thin-film sensor of the fluorescent probe molecule for pH detection and a preparation method of the fluorescent thin-filmsensor. A glass matrix of the sensor is coated with the fluorescent probe molecule. The preparation method comprises the steps of putting the fluorescent probe molecule in a Nafion solution for uniform mixing to form a film casting liquid, spin-coating the film casting liquid onto the glass matrix, putting the glass matrix in a solvent evaporation chamber, heating to 100-120 DEG C under a high vacuum condition, holding the temperature for 0.5-12h, removing a solvent and obtaining the fluorescent thin-film sensor. The invention further discloses the application of the fluorescent probe molecule and the fluorescent thin-film sensor in detecting the pH value of a solution. A ratio-type fluorescent probe has two fluorescent emission peaks, and can be calibrated by two signal peaks of the fluorescent probe, and the detection accuracy is improved.

Description

technical field [0001] The invention belongs to the technical field of pH value detection, and in particular relates to a fluorescent probe molecule for pH detection, a fluorescent film sensor, a preparation method and an application thereof. Background technique [0002] It is an important environmental protection measure to monitor the pH value of discharged wastewater to prevent the discharge of wastewater exceeding the standard. The treatment of acid-base wastewater usually adopts a neutralization scheme to ensure that the pH value of the discharged wastewater is between 6 and 9. However, the large-scale neutralization process is an uncertain process with nonlinear changes. At the same time, the amount and type of sewage discharged by enterprises often change greatly, and the acid-base content changes frequently. The pH value of the wastewater that needs to be neutralized usually changes. Therefore, online real-time monitoring of the pH of discharged wastewater has beco...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/64
CPCG01N21/6428
Inventor 谢永生张新玲
Owner CHONGQING THREE GORGES UNIV
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