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Anisotropic wurtzite MnSe nanocrystal synthesized by utilizing solvothermal method

A wurtzite and anisotropic technology, which is applied in the field of preparing anisotropic wurtzite MnSe nanocrystals, can solve the problems of uncontrollable, impure nanocrystalline crystal structure, irregular shape, etc., and achieve repeatability Effects with high height, controllable shape and aspect ratio, and short synthesis time

Inactive Publication Date: 2012-08-15
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But these MnSe nanocrystals have very wide particle size distribution (25~75 nanometers), and appearance is irregular, uncontrollable; The crystal structure of the nanocrystal of making is impure (85% wurtzite and 15% sphalerite)

Method used

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  • Anisotropic wurtzite MnSe nanocrystal synthesized by utilizing solvothermal method
  • Anisotropic wurtzite MnSe nanocrystal synthesized by utilizing solvothermal method
  • Anisotropic wurtzite MnSe nanocrystal synthesized by utilizing solvothermal method

Examples

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Effect test

Embodiment 1

[0031] Example 1 Synthesis of Anisotropic Wurtzite MnSe Nanocrystals

[0032] The synthesis of anisotropic wurtzite MnSe nanocrystals is carried out in a Schlenk system, and the synthesis process requires nitrogen protection. The specific synthesis process is as follows: 0.032g of anhydrous MnCl 2 , 0.02g Se powder, 4mL oleic acid and 4mL oleylamine were put into a three-necked flask, then the two sides of the three-necked flask were plugged with rubber stoppers, the middle port was connected to the Schlenk system, and the thermocouple was connected from the three-necked flask to the Schlenk system. One side was inserted under the liquid surface, stirred and heated to 200 °C, and a pale yellow clear solution was obtained after about 4 hours. The solution was heated to 300°C at a heating rate of 2°C / min, and the transparent pale yellow solution gradually became turbid, that is, anisotropic wurtzite MnSe nanocrystals were formed, and the sample was extracted after 30 minutes.

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Embodiment 2

[0034] Example 2 Synthesis of Anisotropic Wurtzite MnSe Nanocrystals

[0035] The synthesis of anisotropic wurtzite MnSe nanocrystals is carried out in a Schlenk system, and the synthesis process requires nitrogen protection. The specific synthesis process is as follows: 0.032g of anhydrous MnCl 2 , 0.02g Se powder, 4mL oleic acid and 4mL oleylamine were put into a three-necked flask, then the two sides of the three-necked flask were plugged with rubber stoppers, the middle port was connected to the Schlenk system, and the thermocouple was connected from the three-necked flask to the Schlenk system. One side was inserted under the liquid surface, stirred and heated to 200 °C, and a pale yellow clear solution was obtained after about 4 hours. The solution was heated to 300°C at a heating rate of 15°C / min, and the transparent pale yellow solution gradually became turbid, that is, anisotropic wurtzite MnSe nanocrystals were formed, and the sample was extracted after 30 minutes. ...

Embodiment 3

[0037] Example 3 Synthesis of Anisotropic Wurtzite MnSe Nanocrystals

[0038] The synthesis of anisotropic wurtzite MnSe nanocrystals is carried out in a Schlenk system, and the synthesis process requires nitrogen protection. The specific synthesis process is as follows: 0.032g of anhydrous MnCl 2, 0.02g Se powder, 4mL oleic acid and 4mL oleylamine were put into a three-necked flask, then the two sides of the three-necked flask were plugged with rubber stoppers, the middle port was connected to the Schlenk system, and the thermocouple was connected from the three-necked flask to the Schlenk system. One side was inserted under the liquid surface, stirred and heated to 200 °C, and a pale yellow clear solution was obtained after about 4 hours. The solution was heated to 300°C at a heating rate of 25°C / min, and the transparent pale yellow solution gradually became turbid, that is, anisotropic wurtzite MnSe nanocrystals were formed, and the sample was extracted after 30 minutes.

...

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Abstract

The invention discloses an anisotropic wurtzite MnSe nanocrystal synthesized by utilizing a solvothermal method, belonging to the technical field of nanometer material preparation. Synthetization is carried out under the protection of nitrogen in a schlenk system; manganese chloride and selenium powder are taken as raw materials, oleyl amine and oleic acid are used as ligands; the raw materials and the ligands are placed into a three-necked bottle to be stirred and heated until a clarified faint yellow solution is obtained; the solution is heated to the temperature of 290-320 DEG C in a heating rate of 2-25 DEG C / min; and the temperature is kept for 30-60 minutes to obtain an anisotropic four-footed shape wurtzite MnSe nanocrystal or / and an anisotropic water-drop wurtzite MnSe nanocrystal. The sample prepared by the invention is high in phase purity, good in crystallinity and uniform in particle size distribution. The preparation method is simple in process, short in synthesized time, controllable in morphology and aspect ratio of the product and high in repeatability and the like.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, in particular to a method for preparing anisotropic wurtzite MnSe nanocrystals. Background technique [0002] As an important magnetic semiconductor material, MnSe exhibits various important optical, magnetic, and electronic transport properties. In particular, MnSe is an antiferromagnetic semiconductor material with interesting magnetic arrangements. In thin-film superlattices, this magnetic alignment can be tuned by controlling dimension, thickness and tension. Due to their wide application potential, the synthesis and properties of metastable phase wurtzite MnSe nanocrystals with controllable morphology and size have attracted extensive research interest. [0003] MnSe has three crystal structures: halite, sphalerite and wurtzite. In contrast to many studies focusing on the synthesis and properties of stable rock-salt MnSe, only few works reported the synthesis of sphalerit...

Claims

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Application Information

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IPC IPC(8): C01B19/04B82Y40/00
Inventor 邹勃王英楠杨新一
Owner JILIN UNIV
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