Sulfur quantum dot with ultrahigh fluorescence quantum yield as well as preparation method and application of sulfur quantum dot

A technology of fluorescence quantum yield and sulfur quantum, applied in fluorescence/phosphorescence, chemical instruments and methods, measuring devices, etc., can solve the problem of low fluorescence quantum yield, achieve wide application value, large Stokes shift, excellent water solubility Effect

Active Publication Date: 2021-12-31
CHINA WEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present there are reports about the synthesis of good fluorescent properties, good water solubility, good dispersion, and good stability of sulfur quantum dots with fluorescent properties, but the fluorescence quantum yield is not high (the fluorescence quantum yield is mostly lower than 50%), how to prepare Ultra-high fluorescence quantum yield (ultra-high fluorescence quantum yield refers to the absolute quantum yield of 80% and above) related reports on sulfur quantum dots are still few

Method used

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  • Sulfur quantum dot with ultrahigh fluorescence quantum yield as well as preparation method and application of sulfur quantum dot
  • Sulfur quantum dot with ultrahigh fluorescence quantum yield as well as preparation method and application of sulfur quantum dot
  • Sulfur quantum dot with ultrahigh fluorescence quantum yield as well as preparation method and application of sulfur quantum dot

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] In this example, blue sulfur quantum dots (PTA-SQDs) with ultra-high absolute quantum yield were synthesized by a one-pot method, and the optimal conditions for preparing PTA-SQDs were explored. The specific process is as follows: Add sulfur powder, sodium hydroxide, terephthalic acid and ultrapure water into a round bottom flask. In order to explore the optimal conditions for the synthesis of PTA-SQDs, the blank control experiment, the reaction temperature (respectively 50 ℃, 60 ℃, 70 ℃, 80 ℃, 90 ℃), the molar ratio of sulfur powder and terephthalic acid ( Fix the amount of sulfur powder substance, change the amount of terephthalic acid substance and several aspects of reaction time to discuss.This example sets three groups of blank control experiments without adding sodium hydroxide, terephthalic acid, sulfur powder respectively, and all the other conditions remain No change. From figure 1 It can be seen from the figure that fluorescence emission can only be produced...

Embodiment 2

[0047] In this example, according to the optimal preparation conditions obtained in Example 1 (the reaction temperature is 80°C, the reaction time is 10 hours, and the molar ratio of sulfur powder to terephthalic acid is 20:3), only the sulfur powder is specifically adjusted as a simple substance Sulfur; the rest of the steps and parameters were unchanged.

experiment example

[0049] In this example, the sulfur quantum dot PTA-SQDs prepared under the optimal conditions in Example 1 were tested for characterization, optical properties, fluorescence sensing tartrazine, selectivity and actual sample analysis. It should be noted that the process of tartrazine detection in this example: add PBS buffer (0.1M, pH=6.00), PTA-SQDs solution, ultrapure water and a series of concentrations of tartrazine in a centrifuge tube. These mixed solutions were reacted at room temperature for 1 minute, and the fluorescence intensity at an emission wavelength of 428 nm was recorded at an excitation wavelength of 310 nm. The detection process of the actual sample tartrazine in this example: the determination method of tartrazine in the beverage sample is similar to the determination method of tartrazine in the buffer solution. Orange juice and soft drinks are available for direct purchase. Before opening the vial, shake the sample well to ensure even distribution. Accura...

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Abstract

The invention discloses a sulfur quantum dot with ultrahigh fluorescence quantum yield as well as a preparation method and application thereof, and belongs to the technical field of fluorescent nanomaterials. Blue sulfur quantum dots with ultrahigh absolute quantum yield (greater than 80%) are synthesized by adopting a one-pot method, and the method has the advantages of rapidness, simplicity and low cost. Compared with a conventional preparation method in which polyethylene glycol is used as a passivator, the quantum dots synthesized by terephthalic acid are more uniform in particle size and do not have the characteristic of emission-dependent excitation. In addition, the prepared sulfur quantum dot with the ultrahigh fluorescence quantum yield has the characteristics of large Stokes displacement, excellent water solubility, long-term stability and low toxicity, and has a potential application prospect in the aspects of chemical and biological sensing.

Description

technical field [0001] The invention relates to the technical field of fluorescent nanomaterials, in particular to a sulfur quantum dot with an ultrahigh fluorescent quantum yield and its preparation method and application. Background technique [0002] Food safety issues have always attracted people's attention, and the use of food additives has caused a series of food safety problems. Tartrazine is also called tartrazine (TZ), and its chemical name is 1-(4-sulfonic acid phenyl)-4-(4-sulfonic acid phenylazo)-5-pyrazolone-3-carboxylic acid tris Sodium salt, is a water-soluble synthetic dye with azo functional groups and aromatic structure. Widely used in beverages, jellies, canned food, sugar-coated food, etc., but it is clearly prohibited to be used in meat and processed products, fish and processed products, brewing fruit wine, etc. Studies have shown that long-term or one-time consumption of excessive amounts of TZ may cause diarrhea, allergies, migraines, blurred visio...

Claims

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Application Information

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IPC IPC(8): C09K11/56G01N21/64
CPCC09K11/56G01N21/6428
Inventor 杨秀培彭晓惠王亚张艺梅晓林张宝文
Owner CHINA WEST NORMAL UNIVERSITY
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