Method for controllably synthesizing near-infrared silver telluride quantum dots

A technology of quantum dots and silver telluride, applied in the fields of chemistry and nanomaterial preparation, can solve the problems of morphology, precise control of crystallinity, difficulty in achieving the size of quantum dots, and increase of synthesis cost, and achieves stable and controllable synthesis process. Uniform size and reduced usage

Active Publication Date: 2021-06-15
NANKAI UNIV
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Problems solved by technology

As an expensive organic reagent, phosphine greatly increases the cost of synthesis
[0005]Although the synthesis of silver telluride quantum dots has been developed to a certain extent, it is difficult to precisely control the size, shape and crystallinity of quantum dots, and there are still Problems such as poor particle size distribution, poor crystallinity and low PLQY

Method used

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  • Method for controllably synthesizing near-infrared silver telluride quantum dots
  • Method for controllably synthesizing near-infrared silver telluride quantum dots
  • Method for controllably synthesizing near-infrared silver telluride quantum dots

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Embodiment 1

[0040] Embodiment 1: Preparation of silver telluride quantum dots

[0041] (1) Preparation of tellurium precursor: Weigh 81.6 mg of tellurium powder into a 50 mL three-necked flask, add 6 mL of tri-n-octylphosphine, stir and heat at 270 ° C in air for 10 min to obtain a yellow-green clear solution, cool to room temperature for later use .

[0042] (2) Synthesis and purification of silver telluride quantum dots: Add 4.5mL of 1-octadecene into a 50mL three-necked flask, pass argon gas at 100°C for 10min, add 75.2mg of silver acetate and 0.585mL of n-octyl mercaptan, and The temperature was raised to 110°C, and 0.225mL of tri-n-octylphosphine was added, and then the temperature of the mixture was raised to 160°C, and 0.0702mL of tellurium precursor was quickly injected to rapidly drop the temperature to 150°C. The solution was cooled to room temperature, 35 mL of acetone was added, centrifuged at 10,000 rpm for 10 min, the resulting precipitate was dispersed in tetrachloroethyle...

Embodiment 2

[0043] Embodiment 2: Preparation of silver telluride quantum dots

[0044] (1) Preparation of tellurium precursor: Weigh 81.6 mg of tellurium powder into a 50 mL three-necked flask, add 6 mL of tri-n-octylphosphine, stir and heat at 270 ° C in air for 10 min to obtain a yellow-green clear solution, cool to room temperature for later use .

[0045] (2) Synthesis and purification of silver telluride quantum dots: Add 4.5mL of 1-octadecene into a 50mL three-necked flask, pass argon gas at 100°C for 10min, add 75.2mg of silver acetate and 0.585mL of n-octyl mercaptan, and The temperature was raised to 110°C, 118 mg of triphenylphosphine was added, and then the mixture was heated to 160°C, and 0.0702 mL of tellurium precursor was quickly injected to rapidly drop the temperature to 150°C, and reacted at this temperature for 40 minutes, and the solution was cooled to At room temperature, add 35 mL of acetone, centrifuge at 10,000 rpm for 10 min, disperse the obtained precipitate in ...

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Abstract

The invention discloses a silver precursor, a tellurium precursor and a preparation method for controllably synthesizing silver telluride quantum dots. The method comprises the following steps: mixing one or more silver mercaptide with organic phosphine to prepare an activity-adjustable silver precursor, and thermally injecting the tellurium precursor synthesized in air, thereby obtaining the silver telluride quantum dot. The method is easy to operate, good in repeatability and low in cost. The emission wavelength of the silver telluride quantum dot is adjustable in a range of 1150nm-2000nm by regulating and controlling the types and the proportion of thiol and phosphine, the proportion of a silver source to a tellurium precursor and the reaction time, the half-peak width of the emission wavelength is narrow, and the fluorescence quantum yield can reach more than 10%. The method can be used in the field of biomedical imaging, can also be used for preparing other nano materials containing silver or chalcogenide elements, and is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to a method for preparing silver telluride quantum dots with high brightness and narrow half-peak width and a method for synthesizing the silver telluride precursor, which belongs to the technical field of chemical and nanometer material preparation. Background technique [0002] Living tissue has strong light absorption and light scattering in the visible light region and near-infrared I region (NIR-I, 750nm-900nm), while in the near-infrared II region (NIR-II, 1000nm-1700nm), the excitation light and emission light The light scattering is weak, and it has a better penetration depth in the living body. In the application of living imaging, it helps to obtain images with better signal-to-background ratio. Silver telluride quantum dots are a kind of quantum dots that do not contain toxic heavy metals. The narrow bulk bandgap width (0.67eV) makes the fluorescence emission wavelength theoretically cover the entire NIR-Ⅱ region. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/04C09K11/58
CPCC01B19/007C09K11/582C01P2004/52C01P2004/01
Inventor 庞代文张铭宇刘安安
Owner NANKAI UNIV
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