A preparation method of water-soluble cds-ag2s quantum dots with fluorescence 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, simple and easy methods, and mild reaction conditions

Inactive Publication Date: 2016-04-13
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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  • A preparation method of water-soluble cds-ag2s quantum dots with fluorescence energy transfer
  • A preparation method of water-soluble cds-ag2s quantum dots with fluorescence energy transfer
  • A preparation method of water-soluble cds-ag2s quantum dots with fluorescence energy transfer

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Embodiment 1

[0028] This embodiment provides the above-mentioned water-soluble CdS-Ag with fluorescence energy transfer 2 A method for preparing S core-shell quantum dots. Described method specifically comprises 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 the CdS quantum dot solution;

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

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

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

Embodiment 2

[0041] Use a pipette to accurately pipette 20 mL of deionized water into a round bottom flask, add 2000 μL of freshly prepared 0.5 M polyacrylic acid solution with a pipette gun while stirring, and add 600 μL of 0.4MCd(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.

[0042] Take 10mL of freshly prepared CdS quantum dot solution, then add 500μL of 0.5M 3-mercaptopropionic acid solution with a pipette gun under stirring, then add 1500μL of 0.5M polyacrylic acid solution with a pipette gun, and react in a water bath at 70°C 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 1 mL of prepared mercaptopropionic acid-modified CdS quantum dots ...

Embodiment 3

[0045] Use a pipette to accurately pipette 20 mL of deionized water into a round-bottomed flask, add 2000 μL of freshly prepared 0.5 M PAA solution with a pipette gun while stirring, and add 600 μL of 0.4MCd(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 3h. Finally, the prepared CdS quantum dot solution was stored in a refrigerator at 4 °C under dark conditions.

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

[0047] Take 1 mL of prepared 3-mercaptopropionic acid-modified CdS quantum dots in a four-way c...

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Abstract

The invention provides a method for preparing water-soluble CdS-Ag2S quantum dots with fluorescence energy transfer. The water-soluble CdS-Ag2S quantum dots with fluorescence energy transfer are of core-shell type, the inner core is CdS, the outer shell is Ag2S, and the emission wavelength is 760nm. The method described in the invention prepares CdS-Ag2S quantum dots with ultraviolet absorption and near-infrared emission through a one-pot reaction in water phase, and has the advantages of simple preparation process and mild reaction conditions. Compared with CdS quantum dots, the CdS-Ag2S quantum dots prepared by us have a large stocks shift due to the phenomenon of fluorescence energy transfer, which can realize ultraviolet absorption and infrared emission, so that they can be used in photothermal conversion devices, solar cells, biological therapy, etc. It has a good application prospect.

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