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Method of preparing high temperature ferromagnetism ZnO:(Co,Al) nano-material using sol-gel method

A technology of nanomaterials and gel method, which is applied in the field of ZnO-based dilute magnetic semiconductor nanofilms and powders, can solve the problems that cannot meet the requirements of devices, cannot exclude metal Co clusters, and the repetition rate of films is not high, so as to improve the current carrying capacity. Sub-concentration, low cost, simple technology effect

Inactive Publication Date: 2007-04-18
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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Problems solved by technology

In the thin film system of ZnO: Co, some research groups obtained ferromagnetism, but T c Low, can not meet the requirements of the device; some researchers have obtained room temperature ferromagnetic film, but the possibility of metal Co clusters cannot be ruled out for its magnetic source, and the repetition rate of the film is not high

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  • Method of preparing high temperature ferromagnetism ZnO:(Co,Al) nano-material using sol-gel method
  • Method of preparing high temperature ferromagnetism ZnO:(Co,Al) nano-material using sol-gel method
  • Method of preparing high temperature ferromagnetism ZnO:(Co,Al) nano-material using sol-gel method

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Embodiment Construction

[0013] Preparation of ZnO:(Co,Al) colloidal solution. Analytical pure zinc acetate, cobalt acetate and aluminum chloride were dissolved in ethylene glycol methyl ether in a molar ratio of Zn:Co:Al=94:5:1. Then add ethanolamine equimolar to the metal cation, and configure the solution with a concentration of 0.7 mol / l. Stir at room temperature until the solute is completely dissolved, then magnetically stir for 2 hours in a water bath at 60°C, and finally obtain a uniform and transparent sol. The sol stood for 48 hours without precipitation.

[0014] Drop a few drops of colloidal solution on the pre-cleaned Si wafer or other substrates (quartz glass, sapphire, SiC, etc.), and rotate the substrate at a rate of 2500 rpm for 25 seconds, so that the colloidal solution is evenly coated on the Si wafer. .

[0015] The film was placed in an oven at 125°C for 20 minutes, and then heat-treated at 300°C for 15 minutes.

[0016] Repeat steps 2 and 3 several times to obtain films with ...

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Abstract

The present invention relates to a sol-gel method for preparing ZnO:(Co, Al) nano powder body and film with ferromagnetism, its Curie point is above 360 K. Said sol-gel method includes the following steps: firstly, preparing Co and Al codoped ZnO colloid solution, drop-adding colloid on the precleaned Si chip or other substrate (quartz glass, sapphire and SiC, etc.), utilizing the mode of rotating substrate to make the colloid solution be uniformly coated on the substrate surface, preheating said substrate on which the colloid solution is uniformly coated for a period of time, making heat treatment at 300-350 deg.C, then making annealing treatment at 600-800 deg.C under the condition of argon atmosphere so as to obtain the invented product.

Description

technical field [0001] The invention relates to a preparation technology for obtaining high-temperature ferromagnetic ZnO-based dilute magnetic semiconductor nanomaterials, mainly adopting a sol-gel method combined with a co-doping approach (such as Co and Al co-doping) to prepare a material with a Curie temperature higher than that of a greenhouse ZnO-based dilute magnetic semiconductor nano film and powder. Background technique [0002] In the 21st century, human beings have entered into a highly electronic and information-based society. Information transmission, processing and storage will require unprecedented scale and speed. How to realize the above-mentioned leap in electronic information technology has become a major scientific problem at the beginning of this century. one. The charge and spin of electrons are the two most important physical quantities that identify their characteristics. Semiconductors and magnetic substances based on them are the two most importan...

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Application Information

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IPC IPC(8): C04B35/624C04B35/453H01F1/40
Inventor 刘学超施尔畏陈之战张华伟肖兵宋力昕
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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