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Preparation method of nano ZnO material having room temperature ferromagnetic property

A room-temperature ferromagnetism and nano-material technology, applied in nano-structure manufacturing, magnetic objects, nano-technology, etc., can solve problems such as difficult to improve the room-temperature magnetic properties of ZnO, and achieve the effect of easy operation and simple process

Inactive Publication Date: 2010-02-10
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art that it is difficult to improve the room temperature magnetic properties of ZnO, and provide a new preparation method for ZnO materials with room temperature ferromagnetism, so as to achieve the purpose of significantly improving the room temperature ferromagnetism of ZnO samples

Method used

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  • Preparation method of nano ZnO material having room temperature ferromagnetic property
  • Preparation method of nano ZnO material having room temperature ferromagnetic property
  • Preparation method of nano ZnO material having room temperature ferromagnetic property

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example 1

[0015] The concrete processing steps of this example are as follows:

[0016] Weigh an appropriate amount of Zn(Ac) according to the molar ratio of 1:10 2 2H 2 O and NaOH, and then add the two into an appropriate amount of absolute ethanol, so that Zn(Ac) 2 2H 2 The concentration of O is 0.0125mol / L, and then the solution is ultrasonicated for 30min and then transferred to a 50mL hydrothermal reactor liner, sealed and kept at 120°C for 5h, and the clear liquid is removed after natural cooling, and the obtained product is centrifuged and used The samples were washed with deionized water and absolute ethanol, and finally dried at 70°C for 10 h. Put the dried ZnO nanorods into a strong magnetic field heating furnace for magnetic field heat treatment. The treatment temperature is 700°C, the treatment time is 2h, the atmosphere is air, and the magnetic field is 12T during the heat treatment process, and from the beginning to the end of the heat treatment process A constant magn...

example 2

[0019] ZnO nanoparticles were prepared by chemical water bath deposition. Concentration of 20mmol / L Zn(NO 3 ) 2 ·6H 2 O and hexamethylenetetramine (C 6 h 12 N 4 ) in ethanol solution at 70°C in a water bath for 20 h. Afterwards, the precipitate obtained is centrifuged, washed, and dried to obtain ZnO nanoparticles. Then ZnO nanoparticles are placed in a strong magnetic field heating furnace with an air atmosphere for magnetic field heat treatment. The treatment temperature is 400°C, the treatment time is 5h, the atmosphere is air, and the magnetic field is 12T during the heat treatment process. A constant magnetic field was applied until the end, and the samples were taken out after natural cooling to room temperature.

example 3

[0021] Preparation of ZnO nanowires. ZnO nanowires were prepared by chemical vapor deposition. Then place the ZnO nanowires in a strong magnetic field heating furnace with an air atmosphere for magnetic field heat treatment. The treatment temperature is 800°C, the treatment time is 3h, the atmosphere is air, and the magnetic field is 12T during the heat treatment process. A constant magnetic field was applied until the end, and the samples were taken out after natural cooling to room temperature.

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Abstract

The invention relates to a preparation method of nano ZnO material having a room temperature ferromagnetic property, comprising the following processing steps: utilizing a common chemical or physicalmethod to prepare a nano ZnO precursor and a ZnO film sample or directly prepare ZnO nano material (comprising nanoparticles, nanorods, nanowires, nanotubes, quantum dots and the like), and then placing the sample in an intense magnetic field sintering furnace in an atmosphere of air or other gases (such as oxygen) for heat treatment, applying a magnetic field during the whole heat treatment process, and after natural cooling, obtaining nano ZnO material having room the temperature ferromagnetic property. Through magnetic property analysis, the preparation method is proved to be capable of obviously improving the room temperature ferromagnetic property of the nano ZnO material.

Description

technical field [0001] The invention relates to a preparation method of nanometer ZnO material. Background technique [0002] In modern information technology, semiconductor technology mainly uses the charge degree of freedom of electrons to process information, while magnetic materials use the degree of freedom of electron spin to store information. Magnetoelectronics is a new and rapidly developing field. Here, the electron's charge degree of freedom and spin degree of freedom are simultaneously applied to generate new functionalities. In a broader sense, this new field is spintronics, which includes devices that exploit spin without the need for an external magnetic field or other magnetic materials. [0003] ZnO is an n-type semiconductor with a hexagonal wurtzite crystal structure. As an important inorganic functional oxide, it has a wide range of applications in electronics, optoelectronics, photocatalysis, sensors, etc. Applications. Theoretical analysis and exper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F13/00B82B3/00C01G9/02
Inventor 王军红王栋樑马衍伟
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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