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Universal synthesis method for nanocrystals

A synthesis method and nanocrystal technology, applied in the fields of nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problems of uneven particle size, application limitations of nanomaterials, and inability to universally prepare a variety of nanocrystals.

Inactive Publication Date: 2016-07-20
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] (2) Precipitation method: The advantage of the precipitation method is that the reaction process is simple, the cost is low, and it is convenient for industrial production, but the particle size of the prepared material is not easy to control, and the particle size is uneven, which limits the application of nanomaterials in the fields of electricity and optics;
[0011] The above-mentioned preparation methods all have their own disadvantages, and cannot be used universally for the preparation of various nanocrystals. Therefore, it is of great practical significance to invent a simple and versatile preparation method for various nanocrystals.

Method used

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  • Universal synthesis method for nanocrystals
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  • Universal synthesis method for nanocrystals

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Experimental program
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Effect test

Embodiment 1Z

[0039] The synthesis of embodiment 1ZnO nanocrystal

[0040] Dissolve 0.05mol of zinc acetate in 10mL of water and 30mL of pyridine in a mixed solvent; at the same time, dissolve 0.05mol of potassium hydroxide in 30mL of water; then, drop the potassium hydroxide solution into the zinc acetate solution for 20 minutes; finally, the reaction The temperature of the solution was raised to 80°C, and the reaction was carried out for 2 hours. The zinc oxide nanoparticles were precipitated with acetone and centrifuged to obtain a white solid. Add 30mL of water, sonicate for 10min; then add 30mL of acetone, and centrifuge to obtain pure zinc oxide nanoparticles. figure 1 shown.

Embodiment 2

[0041] The synthesis of embodiment 2CuO nanocrystals

[0042] Dissolve 0.05mol of copper acetate in 10mL of water and 30mL of pyridine mixed solvent, then heat up to 80°C; at the same time, dissolve 0.05mol of potassium hydroxide in 30mL of water, drop into the copper acetate solution, finish dripping in 20min, and react for 2h. The copper sulfide nanoparticles were precipitated with acetone and centrifuged to obtain a dark brown solid. Add 30mL of water, sonicate for 10min; then add 30mL of acetone, and centrifuge to obtain pure copper oxide nanoparticles. The transmission electron microscope and XRD images are as follows figure 2 shown.

Embodiment 3

[0043] The synthesis of embodiment 3CdS nanocrystals

[0044] Dissolve 0.05mol cadmium acetate in a mixed solvent of 10mL water and 30mL pyridine, then raise the temperature to 80°C; at the same time, dissolve 0.05mol sodium sulfide in 30mL water, drop into the cadmium acetate solution, finish dripping in 20min, and react for 2h. The cadmium sulfide nanoparticles were settled down with acetone and centrifuged to obtain an orange-yellow solid. Add 30mL water, sonicate for 10min; then add 30mL acetone, and centrifuge to obtain pure cadmium sulfide nanoparticles. The TEM and XRD images are as follows: image 3 shown.

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Abstract

The invention discloses a universal synthesis method for nanocrystals. The method comprises the steps: firstly, mixing a metal source with a water / pyridine mixed solvent so as to obtain a metal source solution, wherein the metal source is selected from zinc acetate, copper acetate, lead acetate, silver acetate, nickel acetate, cadmium acetate, ferric acetate, magnesium acetate or barium acetate, and the concentration of the metal source solution is 1mol / L to 5mol / L; then, mixing a nonmetal source with water so as to obtain a nonmetal source solution, wherein the nonmetal source is sodium sulfide or potassium hydroxide, and the concentration of the nonmetal source solution is 1mol / L to 5mol / L; and finally, adding the nonmetal source solution into the metal source solution, carrying out a reaction for 2 to 20 hours at the temperature of 60 DEG C to 100 DEG C, and carrying out centrifugal separation, thereby obtaining the nanocrystals. According to the universal synthesis method for the nanocrystals, pyridine serves as a ligand; the universal synthesis method has the characteristics that the reaction conditions are mild, the preparation process and product morphology are controllable, and the universality is high; and the prepared nanocrystals have hydrophilicity and have lipophilicity after ligand exchange, so that the field of application of the nanocrystals is enlarged.

Description

technical field [0001] The invention relates to the field of nanomaterial preparation, in particular to a general synthesis method of nanocrystals. Background technique [0002] Compared with bulk materials, nanomaterials have three major characteristics: (1) quantum size effect; (2) surface effect; (3) macroscopic quantum tunneling effect. These characteristics enable nanomaterials to exhibit new optical, electrical, catalytic, fluorescent, and mechanical properties, so that nanomaterials have a wide range of applications in electronics, catalytic chemistry, pharmacy, and magnetic media. [0003] The preparation methods of nanomaterials can be divided into three categories: gas phase method, liquid phase method and high energy ball milling method. The first two methods are mostly used, but the gas-phase method requires complex equipment, high preparation costs, and cannot meet the requirements of mass production; on the contrary, the liquid-phase method requires simple equ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G9/02C01G3/02C01G11/02C01G11/00C01G53/04C01G5/00C01G21/21C01B17/42C01F5/22C01F11/02C01G49/02B82Y30/00
Inventor 酒同钢方俊锋罗维宁
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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