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Preparation method and application of cadmium sulfide quantum dots

A technology of quantum dots and cadmium sulfide, applied in the field of preparation of cadmium sulfide quantum dots, can solve the problems of low detection sensitivity, high reaction temperature, and harsh reaction conditions

Active Publication Date: 2021-08-31
HUBEI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the existing aqueous phase synthesis of quantum dots is generally synthesized by hydrothermal synthesis, the reaction temperature is high and the reaction conditions are harsh, the production cost is high, and the prepared cadmium sulfide quantum dots can only be used for The detection of a metal ion, and the detection sensitivity is also low

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  • Preparation method and application of cadmium sulfide quantum dots
  • Preparation method and application of cadmium sulfide quantum dots
  • Preparation method and application of cadmium sulfide quantum dots

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preparation example Construction

[0040] The present invention also provides a preparation method for the above-mentioned cadmium sulfide quantum dots, specifically comprising the following steps:

[0041] Preparation containing CdCl 2 and a Cd / thiourea precursor solution of thiourea;

[0042] Mixing the Cd / thiourea precursor solution with a stabilizer and adjusting the pH to alkaline;

[0043] Add Na to the mixed solution adjusted to alkaline 2 S, mixed, that is.

[0044] Among them, CdCl in Cd / thiourea precursor liquid 2 The mass ratio to thiourea is (1.5~2.8):1, preferably (1.8~2.5):1, wherein, when controlling the CdCl in the Cd / thiourea precursor liquid 2 When the mass ratio of cadmium sulfide to thiourea is 2:1, the detection effect of the prepared cadmium sulfide quantum dots is the best. It should be noted that during the synthesis process, the dosage of thiourea needs to be strictly controlled. If there is too much or too little thiourea, the fluorescence intensity of the prepared quantum dots wi...

Embodiment 1

[0049] a. Mix 0.04g CdCl in 14ml ultrapure water 2 2.5H 2 O and 0.015g thiourea to form a Cd / thiourea precursor solution, add 38μL thioglycolic acid (TGA) to 20mL water, then mix the two, and use 1mol L -1 Adjust the pH of the mixed solution to 10.5 with NaOH, then add 0.005g, 0.01g, 0.02g, 0.03g, 0.04g, 0.06g, 0.08g, 0.1g Na 2 S·9H 2 0, stirred for 30min to obtain the synthesized CdS quantum dots.

[0050] b. Mix 0.04g CdCl in 14ml ultrapure water 2 2.5H 2 O and thiourea to form a Cd / thiourea precursor solution, add 38 μL thioglycolic acid (TGA) to 20 mL of water, then mix the two, and use 1mol L -1 Adjust the pH of the mixed solution to 10.5 with NaOH, then add 0.02g Na 2 S·9H 2 O, stirred for 30min to obtain the synthesized CdS quantum dots, wherein the amount of thiourea was 0.005g, 0.01g, 0.015g, 0.022g respectively.

[0051] Characterize the CdS quantum dots synthesized in the two synthesis methods a and b in Example 1, and study its characteristics. Microscopy...

Embodiment 2

[0060] Example 2 Exploration of Factors Affecting Fluorescence Intensity of CdS QDs

[0061] (1) Effect of amino acid peptides on the fluorescence intensity of CdS QDs

[0062] Add 100 μL glycine (Gly), tyrosine (Tyr), aspartic acid (Asp), cystine (Cys-Cys), tryptophan (Try), L-cysteine ​​to 50 μL CdS QDs solution Acid (Cys) (10 -5 mol mL -1 ) and 20 μL glutathione (GSH) (4×10 -5 mol mL -1 ) standard solution, dilute to 5.0 mL with double distilled water. Let stand at room temperature for 5 min, and record the fluorescence intensity (λex=365 nm) of the obtained solution with a fluorescence photometer. Test results such as Figure 7 As shown, the fluorescence intensity of CdSQDs was significantly enhanced by glutathione, and the fluorescence intensity of CdS QDs could be increased by 1.4 times in the presence of glutathione (GSH).

[0063] To further explore the effect of different concentrations of GSH on the fluorescence intensity of CdS QDs: 5, 10, 15, 20, 25, 62.5, 1...

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Abstract

The invention relates to a preparation method and application of cadmium sulfide quantum dots for detecting Cu<2+>, Hg<2+> and Mg<2+>. The cadmium sulfide quantum dot is prepared from CdCl2.5H2O, thiourea and Na2S.9H2O by adopting a specific method at normal temperature, has good selectivity and sensitivity and is successfully applied to detection of Cu<2+>, Hg<2+> and Mg<2+> in water and drinks respectively, and the detection limits of Cu<2+>, Hg<2+> and Mg<2+> are 0.22 ng*mL<-1>, 5.8 ng*mL<-1> and 1.6 ng*mL<-1> respectively. The efficient fluorescence sensor provided by the invention can be used for detecting Cu<2+>, Hg<2+> and Mg<2+> in water and drinks, and has great popularization and application values.

Description

technical field [0001] The invention relates to the field of preparation and application of quantum dots, in particular to a quantum dot that can be used to detect Cu at the same time 2+ , Hg 2 + and Mg 2+ Preparation method and application of cadmium sulfide quantum dots. Background technique [0002] Copper, mercury and magnesium are widely used in metallurgy, chemical industry, building materials and other fields, but they will inevitably cause heavy metal hazards. Among them, mercury is the most harmful. As one of the most serious heavy metal pollutants, once absorbed through the skin or respiratory tract, mercury will pose a threat to the central nervous system, digestive system and kidneys of the human body. Although copper is one of the indispensable metal elements in the human body, too much copper in the blood can lead to diseases such as leukemia, lymphoma, liver ascites, and liver cirrhosis. Magnesium ion is one of the most abundant divalent cations in cells ...

Claims

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Application Information

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IPC IPC(8): C01G11/02B82Y40/00B82Y20/00C09K11/56G01N21/64
CPCC01G11/02B82Y40/00B82Y20/00C09K11/565G01N21/643G01N21/6428C01P2002/84C01P2006/60C01P2002/82C01P2004/04C01P2002/85C01P2006/40G01N2021/6432
Inventor 吴一微何开礼
Owner HUBEI NORMAL UNIV
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