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A method for in-situ controllable radiation synthesis of water-soluble CDS quantum dots with different emission wavelengths

A technology of emission wavelength and synthesis method, applied in chemical instruments and methods, luminescent materials, nanotechnology for materials and surface science, etc. diameter, dispersion and stability

Active Publication Date: 2018-07-17
HUBEI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] After searching, there is no patent application identical to the present invention in China

Method used

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  • A method for in-situ controllable radiation synthesis of water-soluble CDS quantum dots with different emission wavelengths
  • A method for in-situ controllable radiation synthesis of water-soluble CDS quantum dots with different emission wavelengths
  • A method for in-situ controllable radiation synthesis of water-soluble CDS quantum dots with different emission wavelengths

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Experimental program
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Embodiment 1

[0028] First, weigh 0.05-0.2 mol of CdCl with an analytical balance 2 Dissolve in 100mL deionized water, add MPA solution dropwise and stir, MPA and CdCl 2 The molar ratio of the solution is 5:1. After stirring evenly, adjust the pH to 10 with 1M NaOH solution. During this process, the solution turns from clear to cloudy. Continue to add NaOH solution dropwise to become clear and transparent again. Add 3mL of isopropanol IPA as a scavenger for oxidative groups generated during the irradiation process; transfer this solution to a PE plastic bag, seal it, and irradiate; the operating voltage of the electron accelerator is 1000KeV, and the electron beam current is 20mA , the electron beam energy is 1MeV, the running speed of the irradiation car is 7m / s, the irradiation dose rate is 50kGy / pass, and the total irradiation dose is 50kGy. After irradiation, a light yellow CdS quantum dot solution is obtained. The fluorescence spectrometer measures its The emission wavelength is locat...

Embodiment 2

[0030] First, weigh 0.05-0.2 mol of CdCl with an analytical balance 2 Dissolve in 100mL deionized water, add MPA solution dropwise and stir, MPA and CdCl 2The molar ratio of the solution is 8:1. After stirring evenly, adjust the pH to 12 with 1M NaOH solution. During this process, the solution turns from clear to cloudy. Continue to add NaOH solution dropwise until it becomes clear and transparent again. Add 5 mL of isopropanol IPA as a scavenger for oxidative groups generated during the irradiation process; transfer this solution to a PE plastic bag, seal it, and irradiate; the operating voltage of the electron accelerator is 1000KeV, and the electron beam current is 20mA , the energy of the electron beam is 1MeV, the running speed of the irradiation car is 7m / s, the irradiation dose rate is 30kGy / pass, and the total irradiation dose is 30kGy. After irradiation, a light yellow CdS quantum dot solution is obtained. The emission wavelength is located at 540nm under the excitat...

Embodiment 3

[0032] First, weigh 0.05-0.2 mol of CdCl with an analytical balance 2 Dissolve in 100mL deionized water, add MPA solution dropwise and stir, MPA and CdCl 2 The molar ratio of the solution is 3:1. After stirring evenly, adjust the pH to 9.0 with 1M NaOH solution. During this process, the solution turns from clear to cloudy. Continue to add NaOH solution dropwise until it becomes clear and transparent again. Finally, add it to the above mixed solution Add 10mL of isopropanol IPA as a scavenger for oxidative groups generated during the irradiation process; transfer this solution to a PE plastic bag, seal it, and irradiate; the operating voltage of the electron accelerator is 1000KeV, and the electron beam current is 20mA , the electron beam energy is 1MeV, the running speed of the irradiation car is 7m / s, the irradiation dose rate is 10kGy / pass, and the total irradiation dose is 20kGy. After irradiation, a colorless CdS quantum dot solution is obtained. The fluorescence spectrome...

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Abstract

The invention relates to an in-situ controllable radiation synthesis method of water-soluble CdS quantum dots with different emission wavelengths, the in-situ controllable radiation synthesis method comprises the following steps: (1) weighing a certain amount of CdCl2 to dissolve in deionized water, adding mercaptopropionic acid MPA, regulating mixed solution pH, and adding isopropanol; (2) filling the prepared solution into a colorless and transparent PE plastic bag, sealing, using an electronic accelerator, and putting the solution in electron beams for irradiation; and (3) performing rotary evaporation and dialysis on the irradiated solution, adding the isopropanol, centrifuging and drying to obtain the water-soluble CdS quantum dot products. The series of water-soluble CdS quantum dot products prepared by the method have excellent water solubility, controllable different particle sizes, controllable different emission wavelengths, high fluorescence quantum yield, strong dispersion and stability and other characteristics, have the advantages of mild synthesis conditions, easy adjustment, fastness and safety, greenness, environmental friendliness, reduction of use cost, significant comprehensive economic benefits, and can be widely used in solar cells, photocatalytic materials, fluorescent probes, 3D imaging and other various fields.

Description

technical field [0001] The invention relates to an in-situ controllable radiation synthesis method of water-soluble CdS quantum dots with different emission wavelengths, belonging to the technical field of inorganic semiconductor nanomaterial preparation technology. Background technique [0002] At present, the study of nanomaterials has become the focus of global attention, and quantum dots as nanomaterials are favored by many disciplines. When the particle size of semiconductor materials gradually decreases from the bulk phase to a certain critical size (less than or equal to its Exciton Bohr radius of the bulk phase) has quantum properties, the movement of electrons in the material is restricted by three-dimensional space, and the structure and properties of the material also change from macroscopic to microscopic. At this time, the material is called a quantum dot. The particle size of quantum dots is generally between 1 and 10 nm. Since both electrons and holes are quan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G11/02C09K11/56B82Y30/00
CPCB82Y30/00C01G11/02C01P2002/84C01P2004/64C09K11/565
Inventor 李月生韩炎刘义秦江涛孙绍发
Owner HUBEI UNIV OF SCI & TECH
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