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Silver sulfide quantum dot and preparation method and application thereof

A technology of quantum dots and silver sulfide, which is applied in the field of silver sulfide quantum dots and their preparation, and can solve the problems such as the near-infrared second region fluorescent characteristic materials that have not yet been found.

Active Publication Date: 2017-05-31
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

No method has been found in the prior art to prepare materials with near-infrared second-range fluorescence characteristics without gas protection

Method used

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  • Silver sulfide quantum dot and preparation method and application thereof
  • Silver sulfide quantum dot and preparation method and application thereof
  • Silver sulfide quantum dot and preparation method and application thereof

Examples

Experimental program
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Embodiment 1

[0030] Embodiment 1 The method for preparing silver sulfide quantum dots

[0031] (1) 5mmol AgNO 3 Dissolve in 20ml of deionized water to form a colorless and transparent solution, and then add concentrated ammonia water drop by drop under vigorous stirring until the formed brown precipitate completely disappears.

[0032] (2) Transfer the solution to a reaction kettle, add 3ml of dodecanethiol as an oil phase, and place it in an oven at 200° C. for 2 hours.

[0033] (3) Collect the precipitate and discard the supernatant, add 10ml of distilled water, and place in an ultrasonicator to disperse the precipitate evenly. Add 2ml of thioglycolic acid and continue sonication for 1h.

[0034] (4) After the product is filtered through a filter with a pore size of 220nm, it is dialyzed overnight in a dialysis bag with a molecular weight cut-off of MWCO of 500Da (the dialysate is water), and freeze-dried to obtain a silver sulfide quantum with fluorescence characteristics in the secon...

Embodiment 2

[0035] Embodiment 2 The method for preparing silver sulfide quantum dots

[0036] (1) 5mmol AgNO 3 Dissolve in 20ml of deionized water to form a colorless and transparent solution, and then add concentrated ammonia water drop by drop under vigorous stirring until the formed brown precipitate completely disappears.

[0037] (2) Transfer the solution to a reaction kettle, add 3ml of dodecanethiol as an oil phase, and place it in an oven at 200° C. for 3 hours.

[0038] (3) Collect the precipitate and discard the supernatant, add 10ml of distilled water, and place in an ultrasonicator to disperse the precipitate evenly. Add 2ml of thioglycolic acid and continue sonication for 1h.

[0039] (4) After the product is filtered through a filter with a pore size of 220nm, it is dialyzed overnight in a dialysis bag with a molecular weight cut-off of MWCO of 500Da (the dialysate is water), and freeze-dried to obtain a silver sulfide quantum with fluorescence characteristics in the secon...

Embodiment 3

[0040] Embodiment 3 The method for preparing silver sulfide quantum dots

[0041] (1) 5mmol AgNO 3 Dissolve in 20ml of deionized water to form a colorless and transparent solution, and then add concentrated ammonia water drop by drop under vigorous stirring until the formed brown precipitate completely disappears.

[0042] (2) Transfer the solution to a reaction kettle, add 3ml of dodecanethiol as an oil phase, and place it in an oven at 200° C. for 4 hours.

[0043] (3) Collect the precipitate and discard the supernatant, add 10ml of distilled water, and place in an ultrasonicator to disperse the precipitate evenly. Add 2ml of thioglycolic acid and continue sonication for 1h.

[0044] (4) After the product is filtered through a filter with a pore size of 220nm, it is dialyzed overnight in a dialysis bag with a molecular weight cut-off of MWCO of 500Da (the dialysate is water), and freeze-dried to obtain a silver sulfide quantum with fluorescence characteristics in the secon...

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Abstract

The invention provides a novel silver sulfide quantum dot and a preparation method thereof. The preparation method comprises the following steps: preparing an oil soluble silver sulfide quantum dot from an Ag inorganic salt and dodecyl mercaptan in an alkaline condition of ammonia water by virtue of a hydrothermal synthesis method; then performing surface functional group modification on the silver sulfide quantum dot by using mercaptoacetic acid to obtain the water soluble silver sulfide quantum dot; and filtering, dialyzing and freezing and drying the water soluble silver sulfide quantum dot to obtain silver sulfide quantum dot powder. The invention also provides an application of the silver sulfide quantum dot in the field of fluorescence labeling, biochemical analysis, anti-counterfeit technology and the like. The method is simple and can realize a reaction without gas protection. The used raw materials are cheap and easily available, and the prepared material with the near infrared fluorescent characteristic is a non-toxic, low-cost and ideal light-emitting material.

Description

technical field [0001] The invention relates to the technical field of functional nanomaterials, in particular to a silver sulfide quantum dot and its preparation method and application. Background technique [0002] The second near-infrared region refers to a region with a wavelength range of 1000-1400nm. The fluorescence in this band is beyond the recognition range of human eyes, so it has important applications in anti-counterfeiting, information encryption and other fields. In addition, the spectrum in this band has the characteristics of weak biological tissue scattering and low autofluorescence, so it has deeper tissue penetration ability and has great potential in the field of biological fluorescent labeling. Most of the currently synthesized materials with fluorescence characteristics in the second near-infrared region are based on heavy metal toxic atoms such as Pb and Cb as raw materials, which are potentially dangerous. The near-infrared fluorescent materials ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/58B82Y20/00B82Y40/00
CPCB82Y20/00B82Y40/00C09K11/582C01G5/00
Inventor 周明吴谦
Owner TSINGHUA UNIV
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