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Self-separating method of aqueous-phase semiconductor nanocrystalline under room temperature

A semiconductor and nanocrystal technology, applied in the field of self-separation of high-quality aqueous semiconductor nanocrystals at room temperature, can solve the problems of unrecyclable supernatant, pollution, and large solvent consumption, and achieve good experimental repeatability and high fluorescence The effects of quantum efficiency and easy experimental operation

Inactive Publication Date: 2013-07-10
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the above separation process, a large amount of solvent will be consumed. In addition, the centrifugation process takes too long and consumes a large amount of energy. Moreover, the discarded supernatant cannot be recycled, causing a lot of waste and environmental pollution. This is the bottleneck encountered when applying nanocrystals to a large number of applications

Method used

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  • Self-separating method of aqueous-phase semiconductor nanocrystalline under room temperature
  • Self-separating method of aqueous-phase semiconductor nanocrystalline under room temperature
  • Self-separating method of aqueous-phase semiconductor nanocrystalline under room temperature

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Effect test

Embodiment 1

[0022] At room temperature, add 1×10 to 100ml open reaction system -4 mol of CdCl 2 , 2×10 -5 mol of Na 2 TeO 3 , 2×10 -4 mol mercaptoethylamine, 0.03g of NaBH 4 , 28mL of 80wt% N 2 h 4 ·H 2 O solution; CdCl 2 、Na 2 TeO 3 , mercaptoethylamine, NaBH 4 , N 2 h 4 ·H 2 The molar ratio of O is 1:0.2:2.0:8.0:5000. After 3 hours at room temperature in the dark, if figure 1 As shown in (a-c), CdTe nanocrystals with a fluorescent color of green (emission peak at 526nm) and an average particle size of 2.3nm were obtained at the bottom of the reactor. Figures (d–f) show that the self-isolated CdTe nanocrystals can be redispersed in aqueous solution, while the fluorescence is well maintained.

Embodiment 2

[0024] At room temperature, add 1×10 to 100ml open reaction system -4 mol of CdCl 2 , 2×10 -4 mol mercaptoethylamine, 2×10 -5 mol of Na 2 TeO 3 , 0.03g of NaBH 4 , 45mL of 80wt% N 2 h 4 ·H 2 O solution; CdCl 2 、Na 2 TeO 3 , mercaptoethylamine, NaBH 4 , N 2 h 4 ·H 2 The molar ratio of O is 1:0.2:2.0:8.0:8000. After 3 hours at room temperature in the dark, if figure 2 As shown in (a-c), CdTe nanocrystals with yellow fluorescent color (emission peak at 564 nm) were obtained at the bottom of the reactor. Figures (d–f) show that the self-isolated CdTe nanocrystals can be redispersed in aqueous solution, while the fluorescence is well maintained.

Embodiment 3

[0026] At room temperature, add 1×10 to 100ml open reaction system -4 mol of CdCl 2 , 2×10 -4 mol mercaptoethylamine, 2×10 -5 mol of Na 2 TeO 3 , 0.03g of NaBH 4 , 56mL of 80wt% N 2 h 4 ·H 2 O solution; CdCl 2 、Na 2 TeO 3 , mercaptoethylamine, NaBH 4 , N 2 h 4 ·H 2 The molar ratio of O is 1:0.2:2.0:8.0:10000. After 3 hours at room temperature in the dark, if image 3 As shown in (a-c), CdTe nanocrystals with an orange fluorescence color (emission peak at 588 nm) were obtained at the bottom of the reactor. Figures (d–f) show that the self-isolated CdTe nanocrystals can be redispersed in aqueous solution, while the fluorescence is well maintained.

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Abstract

The invention relates to a self-separating method of aqueous-phase semiconductor nanocrystalline under room temperature and belongs to the technical field of semiconductor nanocrystalline preparation. The self-separating method comprises the following steps of: adding a cadmium salt to a vessel, dissolving the cadmium salt by using water, then adding sulfydryl micromolecules and an ionic tellurium source or an ionic selenium source, then adding NaBH4, and finally adding an ammonia compound water solution to the reaction system; and slightly shaking, and placing for 3-5 hours at room temperature to obtain the semiconductor nanocrystalline self-separated at the bottom of the vessel, wherein in the reaction system, the concentration of the cadmium salt is 1.0*10<-4>-1.0*10<-2>mol / L, and the molar ratio of the cadmium salt to the ionic tellurium source or ionic selenium source to the micromolecules to the NaBH4 to ammonia compounds is 1:(0.1-0.2):(1.5-2.4):(3.3-10.5):(176-20000). The self-separating method is favorable in experimental repeatability; and meanwhile, the self-separated nanocrystalline keeps higher fluorescence quantum efficiency. The self-separating method can be applicable to a self-separating process of semiconductor nanocrystalline of various ligands.

Description

technical field [0001] The invention belongs to the technical field of semiconductor nanocrystal preparation, and in particular relates to a self-separation method of high-quality water-phase semiconductor nanocrystal at room temperature. Background technique [0002] Due to the quantum size effect, semiconductor nanocrystals show unique size-dependent luminescent properties, and are applied in many fields, such as optoelectronics and photovoltaic devices, bioluminescent labels, smart materials, sensors, etc., and thus gradually become a material research field. a hot spot. With the deepening of research, various high-quality semiconductor nanocrystals have been created. Because of low cost, less pollution, easy operation, and good biocompatibility, thiol ligand-stabilized aqueous semiconductor nanocrystals have attracted more attention. Generally, before using the aqueous phase nanocrystals, it usually needs to be purified. Usually, some poor solvents are added to the pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/88
Inventor 张皓周鼎刘敏潘洪兵杨柏
Owner JILIN UNIV