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Synthesis method of nano quantum material

A synthesis method, quantum technology, applied in the field of synthesis of nano-quantum materials, can solve the problems of low synthesis output, low yield of quantum dots, difficulty in long-term stable storage, etc.

Inactive Publication Date: 2015-09-02
王鹏
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Chinese invention patent with the application number 201410269930.7 discloses a rapid and trace synthesis method of CdS quantum dots. The process is relatively simple, and the solvent is the water phase, but the synthesis yield is small, and the stabilization effect of only shell protective agents such as mercaptosuccinic acid is not good. ; Patent ZL200710134534.3 discloses a method for preparing cadmium telluride quantum dots with high fluorescence efficiency from a cathode tellurium electrode, using a compound containing a mercapto group or a compound capable of coordinating with cadmium ions as a stabilizer, and preparing a high fluorescence efficiency quantum dot in an aqueous phase CdTe quantum dots, but they need to be stored at 4 ℃, and they can only be stable for a few months at most
[0003] Generally speaking, the technology of synthesizing quantum dots in water phase is convenient and efficient, but because the existing methods only use thioglycolic acid, mercaptosuccinic acid, etc. as stabilizers, the synthesis The yield of the quantum dots produced is low, the stability is poor, and it is difficult to store them stably for a long time, which greatly limits the functional application of quantum dots and other quantum nanomaterials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Example 1 . Take 6.5 mg DMSA, 200 μL 1 M NaOH (a.q.), and 120 μL 0.1 M CdCl 2 (a.q.) were added to 20 mL ultrapure water in turn to form a mixed solution. Add Hg(CH 3 COO) 2 Make the concentration of Hg(II) 1.0 nM. in N 2 Under the atmosphere, the Te electrode was used to electrolyze at the potential of −1.0 V (vs. SCE) until the electrolysis capacity was 0.5 coulomb. The resulting solution was refluxed in a water bath at 50 °C for 20 h. After reflux for further purification, add an isopropanol solution equal in volume to the solution obtained after reflux, and centrifuge at 8000 rpm for 5 minutes. The resulting precipitate was carefully washed with a mixed solution of isopropanol and water at a volume ratio of 1:1, and redispersed in 20 mL of water to obtain a DMSA-CdTe quantum nanomaterial solution. The material is stable for more than a year, and scanning electron microscope images of its condensed state show particle sizes around 20 nm.

Embodiment 2

[0012] Example 2 . Take 8 mg MPA, 200 μL 1 M NaOH (a.q.), and 120 μL 0.1 M CdCl 2 (a.q.) were added to 20 mL ultrapure water in turn to form a mixed solution. Add Hg(NO 3 ) 2 Make the concentration of Hg(II) 2.0 nM. in N 2 Under the atmosphere, the Te electrode was used to electrolyze at the potential of −1.0 V (vs. SCE) until the electrolysis capacity was 0.5 coulomb. The resulting solution was refluxed in a water bath at 80 °C for 24 h. After reflux for further purification, add an isopropanol solution equal in volume to the solution obtained after reflux, and centrifuge at 8000 rpm for 5 minutes. The resulting precipitate was carefully washed with a mixed solution of isopropanol and water at a volume ratio of 1:1, and redispersed into 25 mL of water to obtain the MPA-CdTe quantum dot solution. Quantum dots are stable for more than a year.

Embodiment 3

[0013] Example 3. Take 6.5 mg DMSA, 200 μL 1 M NaOH (a.q.), and 120 μL 0.1 M CdCl 2 (a.q.) were added to 20 mL ultrapure water in turn to form a mixed solution. Add HgSO to the above solution 4 Make the concentration of Hg(II) 10.0 nM. in N 2 Under the atmosphere, the Te electrode was used to electrolyze at the potential of −1.0 V (vs. SCE) until the electrolysis capacity was 0.5 coulomb. The resulting solution was refluxed in a water bath at 80 °C for 10 h. After reflux for further purification, add an isopropanol solution equal in volume to the solution obtained after reflux, and centrifuge at 8000 rpm for 5 minutes. The resulting precipitate was carefully washed with a mixed solution of isopropanol and water at a volume ratio of 1:1, and redispersed in 20 mL of water to obtain a DMSA-CdTe quantum nanomaterial solution. The material is stable for over a year. The fluorescence spectrum shows that under the excitation of 380 nm, the emission peak is located at 580 nm...

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Abstract

The invention relates to a stable quantum nano-material aqueous-phase synthesis method. By adding soluble and / or micro-soluble salt of Hg (II) to a prepared water solution containing Cd (II), the concentration of Hg (II) is 0.1-100nM, and the molar ratio of Hg (II) to Cd (II) is less than 1: 100, in particular less than 1: 1000, so as to achieve electrolysis and / or hydrothermal synthesis. During synthesizing, a stable co-precipitated crystal nucleus is formed from Hg and Cd through the interaction of electronic shells, so as to promote the generation of a stable quantum dot solution. The prepared nano quantum material can be stably preserved in an aqueous phase for more than 1 year at room temperature.

Description

technical field [0001] The invention belongs to the technical field of material preparation and relates to a method for synthesizing a stable nanometer quantum material. Specifically, it is a quantum dot synthesis method prepared by electrolysis and capable of stably existing in the water phase for more than one year without coagulation. Background technique [0002] Nano-quantum materials refer to materials that are nano-scale in size and have quantum confinement effects, especially zero-dimensional nanomaterial quantum dots that are regarded as quasi-atoms. Quantum dots have extremely small size and quantum confinement effect, which makes them exhibit a series of excellent properties, such as high fluorescence yield, good stability, wide and continuous excitation light range, adjustable color and good biocompatibility. These properties enable numerous applications in fields such as photovoltaics, light sources, electronics, bioimaging, and information storage. The synthe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/89
Inventor 王鹏
Owner 王鹏
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