Red water-soluble AgInS2 quantum dots and one-step synthesis method and application thereof

A water-soluble, quantum dot technology, applied in chemical instruments and methods, gallium/indium/thallium compounds, inorganic chemistry, etc., can solve problems such as mass production and promotion, and achieve strong controllability of results, huge application prospects, The effect of simple process conditions

Active Publication Date: 2019-11-05
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because of the Cd and Te raw materials used in it, it ca

Method used

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  • Red water-soluble AgInS2 quantum dots and one-step synthesis method and application thereof
  • Red water-soluble AgInS2 quantum dots and one-step synthesis method and application thereof
  • Red water-soluble AgInS2 quantum dots and one-step synthesis method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] At a temperature of 200°C, a ratio of Ag, In, and S elements of 1:1:2, and a reaction time of 6 hours, red water-soluble AgInS was synthesized. 2 The quantum dot method is as follows:

[0034] 1) Weigh 116.9 mg of silver acetate, dissolve 381.9 mg of indium nitrate tetrahydrate in 50 ml of deionized water, and stir evenly to obtain a clear and transparent Ag and In precursor solution; then weigh 480 mg of sodium sulfide. water, poured into the above solution, the solution immediately reacted and turned into brown-black, and the magnetic stirring was even.

[0035] 2) Move the reacted solution to a reaction kettle, put the reaction kettle into a blast drying oven, set the reaction temperature to 200°C, and the reaction time to 6 hours to obtain a red solution in a natural state, and use fluorescence spectroscopy for sampling Fluorescence test was carried out with a photometer, and the sample was centrifuged and dried to obtain a powder for ultraviolet-visible absorption...

Embodiment 2

[0039] At a temperature of 200°C, a ratio of Ag, In, and S elements of 1:1:2, and a reaction time of 12 hours, red water-soluble AgInS was synthesized. 2 The quantum dot method is as follows:

[0040] The synthesis method of Example 2 is the same as that of Example 1, the difference is that the reaction time is increased to 12 hours, and the water-soluble AgInS which is red in natural state is obtained. 2 quantum dots. After the reaction is completed, samples are taken for fluorescence testing, centrifuged and dried to obtain a powder for XRD and UV-visible absorption testing.

[0041] figure 2 AgInS prepared for Example 2 2 The UV-Vis diffuse reflectance spectrum of , the inset in the figure is the band gap diagram. It can be seen from the figure that the sample shows obvious reflection in the visible light range of 600-780nm, and shows a steep rise at the visible light absorption edge. This shows that the visible light absorption band is transformed by the band gap, not...

Embodiment 3

[0047] At a temperature of 200°C, a ratio of Ag, In, and S elements of 1:1:2, and a reaction time of 24 hours, red water-soluble AgInS was synthesized. 2 The quantum dot method is as follows:

[0048] The synthesis method of Example 3 is the same as that of Example 1, and the reaction time is increased to 24 hours to obtain a red solution in a natural state. Samples are taken for fluorescence testing, samples are centrifuged and dried, and powders are obtained for UV-visible absorption testing.

[0049] image 3 AgInS prepared for Example 3 2 The UV-Vis diffuse reflectance spectrum of , the inset is the bandgap diagram. It can be seen from the figure that the sample shows obvious reflection in the visible light range of 600-780nm, and shows a steep rise shape at the visible light absorption edge. This shows that the visible light absorption band is transformed by the band gap, not by the impurity energy level. According to the Kubelka-Munk formula, the intersection of the i...

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Abstract

The invention relates to a one-step synthesis method of red AgInS2 water-soluble quantum dots, and the method comprises the following steps: s1, dissolving Ag<+> salt and In<3+> salt in water, and uniformly stirring to dissolve the two salts to obtain a solution A; s2, adding sulfurized salt into the solution A and dissolving the sulfurized salt to obtain a solution B; s3, putting the solution B into a reaction kettle and reacting for 1 to 48 hours at the temperature of 100 to 200 DEG C to obtain the red AgInS2 water-soluble quantum dots. Compared with the prior art, the one-step synthesis method adopts a reaction kettle for one-step synthesis, has simple process conditions, safe operation process and strong controllability of results, and can be applied to industrialized synthesis of a large number of the red water-soluble AgInS2 quantum dots; the quantum dots with different fluorescence properties can be synthesized by controlling the molar ratio of silver, indium and sulfur, reaction time and reaction temperature parameters, and the size and forbidden band width of the quantum dots can be flexibly controlled.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a red water-soluble indium silver sulfide quantum dot and a one-step synthesis method and application thereof. Background technique [0002] At present, the research on quantum dots is increasing day by day, and its synthesis methods are different. Regardless of whether it is binary quantum dots or ternary quantum dots, organic phase synthesis methods, aqueous phase synthesis methods, etc. are generally used. In addition, some innovative experiments will use oil phase wrapping, metal doping, etc. to improve the quantum yield and obtain more ideal quantum dots. Since binary quantum dots contain carcinogenic heavy metals such as Cd, Pb, and Hg, the synthetic production poses a great safety threat to operators, and the production cost also increases a lot, which limits its application prospects. [0003] AgInS 2 It is a new type of ternary quantum dots of ⅠA-ⅢA-VIA group, w...

Claims

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Application Information

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IPC IPC(8): C01G15/00C09K11/62B82Y20/00B82Y40/00G01N21/64H01L33/50
CPCC01G15/006C09K11/621B82Y20/00B82Y40/00H01L33/502G01N21/6428G01N2021/6439C01P2002/72C01P2002/84
Inventor 袁斌霞蔡晓东刘晓波王道累李敏刘建峰吴懋亮朱群志
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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