Method for preparing water-soluble CdS-Ag2S quantum dot with fluorescent energy transfer

A technology of fluorescent energy transfer and quantum dots, which is applied in the field of quantum dots, can solve problems such as the preparation method of S quantum dots that have not yet been seen, and achieve the effects of mild temperature requirements, good application prospects, and mild reaction conditions

Inactive Publication Date: 2014-12-24
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] So far, there is no CdS-Ag that has the optical properties of ultraviolet absorption and near infrared emission due to the phenomenon of fluorescence energy transfer 2 Related reports on S quantum dots and their preparation methods

Method used

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  • Method for preparing water-soluble CdS-Ag2S quantum dot with fluorescent energy transfer
  • Method for preparing water-soluble CdS-Ag2S quantum dot with fluorescent energy transfer
  • Method for preparing water-soluble CdS-Ag2S quantum dot with fluorescent energy transfer

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Embodiment 1

[0028] This embodiment provides the above-mentioned water-soluble CdS-Ag with fluorescence energy transfer 2 Preparation method of S core-shell quantum dots. The method specifically includes the following steps:

[0029] (1) Preparation of CdS quantum dots

[0030] First mix the polyacrylic acid solution and the cadmium nitrate solution, and control the pH of the mixed solution to 9.80, then add thiourea and react at 70°C for 3 hours to obtain a CdS quantum dot solution;

[0031] In the step (1), the molar ratio of the polyacrylic acid, cadmium nitrate and thiourea is: n PAA :n Cd(NO3)2 =6~10, n Cd(NO3)2 :n Thiourea =1~3; the molar ratio in this embodiment is n PAA :n Cd(NO3)2 :n Thiourea =15:2.5:2;

[0032] (2) Preparation of CdS quantum dots modified with 3-mercaptopropionic acid

[0033] After adding the 3-mercaptopropionic acid solution to the CdS quantum dot solution obtained in step (1), add the polyacrylic acid solution to the mixed solution and react at 70°C for 1 to 3 hou...

Embodiment 2

[0041] Use a pipette to accurately pipette 20mL deionized water into the round bottom flask, add 2000μL of freshly prepared 0.5 M polyacrylic acid solution with a pipette while stirring, and add 600μL 0.4M Cd(NO 3 ) 2 Solution, and adjust the pH of the mixed solution to 9.80 with 1M sodium hydroxide solution. Then add 0.0189 g of thiourea, and react in a 70°C water bath for 3 hours. Finally, the prepared CdS quantum dot solution was stored in a refrigerator at 4°C under dark conditions.

[0042] Take 10 mL of the freshly prepared CdS quantum dot solution, then add 500 μL of 0.5M 3-mercaptopropionic acid solution with a pipette while stirring, and then add 1500 μL of 0.5M polyacrylic acid solution with a pipette to the 70℃ water bath Reaction for 1h. Finally, the prepared 3-mercaptopropionic acid-modified CdS quantum dot solution was stored in a refrigerator at 4°C under dark conditions.

[0043] Take 1mL of the prepared mercaptopropionic acid modified CdS quantum dots into a four...

Embodiment 3

[0045] Use a pipette to accurately pipette 20mL of deionized water into a round bottom flask, add 2000μL of freshly prepared 0.5 M PAA solution with a pipette while stirring, and add 600μL of 0.4M Cd(NO 3 ) 2 Solution, and adjust the pH of the mixed solution to 9.80 with 1M sodium hydroxide solution, then add 0.0189g of thiourea, and react in a 70°C water bath for 3 hours. Finally, the prepared CdS quantum dot solution was stored in a refrigerator at 4°C under dark conditions.

[0046] Take 10 mL of the freshly prepared CdS quantum dot solution, then add 500 μL of 0.5M 3-mercaptopropionic acid solution with a pipette while stirring, then add 1500 μL of 0.5M PAA solution with a pipette, and react in a 70℃ water bath 2h. Finally, the prepared 3-mercaptopropionic acid-modified CdS quantum dot solution was stored in a refrigerator at 4°C under dark conditions.

[0047] Take 1mL of the prepared 3-mercaptopropionic acid modified CdS quantum dots into a four-way cuvette, add 0μL, 50μL, 1...

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Abstract

The invention provides a method for preparing a water-soluble CdS-Ag2S quantum dot with fluorescent energy transfer. The water-soluble CdS-Ag2S quantum dot with the fluorescent energy transfer is in a core-shell shape, an inner core is CdS, an outer shell layer is Ag2S, and the emission wavelength is 760 nanometers. The method provided by the invention can be used for preparing the CdS-Ag2S quantum dot with ultraviolet absorption and near-infrared emission by virtue of water phase one-pot reaction and has the advantages of simple preparation process, mild reaction condition and the like. Compared with a CdS quantum dot, the CdS-Ag2S quantum dot prepared by the method has larger stocks displacement due to the generation of a fluorescent energy transfer phenomenon and can realize the ultraviolet absorption and near-infrared emission, thereby achieving very good application prospect on the aspects of a photothermal conversion device, a solar battery, biological therapy and the like.

Description

technical field [0001] The invention relates to the field of quantum dots, in particular to a water-soluble CdS-Ag with fluorescence energy transfer 2 Preparation method of S quantum dots. Background technique [0002] As a new type of fluorescent nanomaterial, semiconductor quantum dots (QDs) have many unique and excellent optical properties, such as strong photobleaching resistance, good chemical stability, wide absorption spectrum, narrow emission spectrum, and adjustable emission wavelength. Avoid the disadvantages of organic fluorescent probes. According to the composition of the elements that make up quantum dots, quantum dots can be divided into II-VI group (such as CdS quantum dots), IV group (such as Si quantum dots), IV-VI group (PbSe and other quantum dots), III-V group (Quantum dots such as GaN) and Group IV-IV (quantum dots such as SiC), etc. Wherein II-VI group semiconductor quantum dots include ZnO, ZnSe, ZnS, ZnTe, CdS, CdTe and CdSe and the like. In addi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/58C09K11/02
Inventor 安学勤李振
Owner EAST CHINA UNIV OF SCI & TECH
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