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Preparation method of Cr-doped TiO2 nanometer magnetic film with room-temperature ferromagnetic effect

A ferromagnetic effect and nano-magnetic technology, applied in the direction of surface reaction electrolytic coating, electrolytic coating, coating, etc., to achieve the effect of high controllability, low cost and low cost

Inactive Publication Date: 2014-01-22
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, it has been found in practice that some of the TiO prepared by the above technology 2 There is segregation of magnetic ions in dilute magnetic thin film materials, and the formation of magnetic agglomerates or second phases (such as elemental Co and CoTiO 3 etc.), causing great controversy over the intrinsic properties of room temperature ferromagnetism

Method used

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  • Preparation method of Cr-doped TiO2 nanometer magnetic film with room-temperature ferromagnetic effect
  • Preparation method of Cr-doped TiO2 nanometer magnetic film with room-temperature ferromagnetic effect
  • Preparation method of Cr-doped TiO2 nanometer magnetic film with room-temperature ferromagnetic effect

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Effect test

Embodiment 1

[0025] 1) Dissolve a certain mass of ammonium fluoride in a mixed solution of ethylene glycol and deionized water with a volume ratio of 294:6 to make a mass percentage of ammonium fluoride of 2.4×10 -3 organic fluorine-containing electrolyte;

[0026] 2) Ultrasonic cleaning the metal titanium sheet with acetone, absolute ethanol and deionized water for 10 minutes respectively, and then drying it naturally for use;

[0027] 3) Then clamp and fix the cleaned titanium sheet as the anode, and place the platinum electrode parallel to it as the cathode to form an electrode system, and the distance between them is 2.5cm;

[0028] 4) Immerse the electrode system assembled as in step 3) into the electrolyte as in step 1), use a DC constant voltage source as the power supply, adjust the open circuit voltage directly from 0V to 60V, control the reaction temperature at 15°C, and react after 3 hours Obtaining Amorphous TiO on the Surface of Metal Titanium Sheet 2 nanotube film.

[0029...

Embodiment 2

[0033] 1) Dissolve a certain mass of ammonium fluoride in a mixed solution of ethylene glycol and deionized water with a volume ratio of 294:6 to make a mass percentage of ammonium fluoride of 3.6×10 -3 % organic fluorine-containing electrolyte;

[0034] 2) Ultrasonic cleaning the metal titanium sheet with acetone, absolute ethanol and deionized water for 10 minutes respectively, and then drying it naturally for use;

[0035] 3) Then clamp and fix the cleaned titanium sheet as an anode, and place a platinum electrode parallel to it as a cathode to form an electrode system, and the distance between them is 3cm;

[0036]4) Immerse the electrode system assembled as in step 3) into the electrolyte as in step 1), use a DC constant voltage source as the power supply, adjust the open circuit voltage directly from 0V to 60V, control the reaction temperature at 45°C, and react after 1 hour Obtaining Amorphous TiO on the Surface of Metal Titanium Sheet 2 nanotube film.

[0037] 5) A ...

Embodiment 3

[0041] 1) Dissolve a certain mass of ammonium fluoride in a mixed solution of ethylene glycol and deionized water with a volume ratio of 294:6 to make a mass percent of ammonium fluoride of 2.6×10 -3 % organic fluorine-containing electrolyte;

[0042] 2) Ultrasonic cleaning the metal titanium sheet with acetone, absolute ethanol and deionized water for 10 minutes respectively, and then drying it naturally for use;

[0043] 3) Then clamp and fix the cleaned titanium sheet as the anode, and place the platinum electrode parallel to it as the cathode to form an electrode system, and the distance between them is 2.5cm;

[0044] 4) Immerse the electrode system assembled as in step 3) into the electrolyte as in step 1), use a DC constant voltage source as the power supply, adjust the open circuit voltage directly from 0V to 60V, control the reaction temperature at 25°C, and react after 3 hours Obtaining Amorphous TiO on the Surface of Metal Titanium Sheet 2 nanotube film.

[0045]...

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Abstract

The invention relates to a preparation method of a Cr-doped TiO2 nanometer magnetic film with a room-temperature ferromagnetic effect, belonging to the technical field of a functionalized material. The preparation method comprises the steps of: by taking a TiO2 nanotube array thin film, prepared by but not limited to electrochemical anode oxidization technology, as a starting material, firstly carrying out CrNO3 aqueous solution soaked novel homogeneous-phase low-temperature Cr doping, then carrying out high-temperature annealing treatment, introducing composite vacancy and oxygen vacancy defects into the TiO2 nanotube array thin film, to obtain the TiO2 nanometer magnetic film which is high in room-temperature ferromagnetic property and controllability, low in cost, good in repeatability and can be manufactured in large scale. The preparation method has the characteristics of simple technology, low cost and good controllability and is suitable for mass production.

Description

technical field [0001] The invention belongs to the technical field of functional materials, relates to a magnetic thin film material and its preparation technology, in particular to a TiO with room temperature ferromagnetic effect 2 A method for nanomagnetic thin films. technical background [0002] Diluted magnetic semiconductors (DMSs) have broad application prospects in the fields of spintronics, magnetism, and microelectronics because they have both semiconducting properties and ferromagnetism. It usually refers to a new type of semiconductor material formed by partially replacing the cations in the semiconductor with magnetic ions. Compared with ordinary magnetic semiconductors, dilute magnetic semiconductors contain fewer magnetic ions, and the distribution of magnetic ions is disordered. It has the comprehensive properties of ferromagnetic materials and semiconductors. The key to the realization of spintronic devices is to prepare room temperature dilute magnetic s...

Claims

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Application Information

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IPC IPC(8): C25D11/26
Inventor 廖宇龙张怀武白飞明钟智勇贾利军李颉周廷川
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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