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A transition layer surface modification method capable of regulating interfacial nanoparticles

A nanoparticle and surface modification technology, applied in the field of high-temperature superconducting material preparation, can solve the problems of difficulty in controlling particle dispersion, size and particle density, limited effect, and difficulty in pinning the number of defects, preventing particle agglomeration, Good particle shape, avoid the effect of agglomeration

Active Publication Date: 2016-06-22
深创超导(深圳)科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under this route, only the van der Waals force is used to regulate the shape of the nanoparticles, which plays a limited role. Therefore, how to control the shape of the particles is a difficult research point.
In the current method, only by adjusting the preparation parameters, it is difficult to control the dispersion, size and particle density of the particles, so it is difficult to ensure the number of pinning defects.

Method used

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  • A transition layer surface modification method capable of regulating interfacial nanoparticles
  • A transition layer surface modification method capable of regulating interfacial nanoparticles
  • A transition layer surface modification method capable of regulating interfacial nanoparticles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) Cut and polish the (001)-LAO single crystal substrate away from (001) by 10°.

[0025] 2) Dissolve zirconium acetylacetonate and yttrium acetylacetonate in n-propionic acid at a molar ratio of zirconium ions to cerium ions of 0.9:0.1 and a total concentration of zirconium ions and yttrium ions of 0.001mol / L to obtain a precursor solution;

[0026] 3) Apply the precursor solution in step 2) to the single crystal substrate treated in step 1) by spin coating, the rotation speed is 1000rpm, and the time is 100s to obtain the precursor film;

[0027] 4) in H 2 Mixing with Ar (H 2 The volume percentages of Ar and Ar were 4% and 96%, respectively) under gas protection conditions, the precursor film was sintered at 1300 °C for 200 minutes to obtain YSZ nanodots.

[0028] 5) The surface topography of YSZ is as follows figure 1 As shown, the AFM-3D photos show that the nanodots are completely dispersed by the step flow, and the particle size is the same as the width of the ...

Embodiment 2

[0030] 1) Cut and polish the (001)-LAO single crystal substrate away from (001) by 20°.

[0031] 2) Dissolve zirconium acetylacetonate and cerium acetylacetonate in n-propionic acid, according to the molar ratio of zirconium ions and cerium ions of 0.8:0.2, and the total concentration of zirconium ions and cerium ions at 0.003 mol / L, to obtain a precursor solution;

[0032] 3) Apply the precursor liquid obtained in step 2) to the single crystal substrate processed in step 1) by spin coating, the rotation speed is 5000rpm, and the time is 40s to obtain the precursor film;

[0033] 4) in H 2 Mixing with Ar (H 2 The volume percentages of Ar and Ar are 4% and 96%, respectively) under gas protection conditions, the precursor film obtained in step 3) was sintered at 1150°C for 300 minutes to obtain CZO nanodots.

[0034] 5) The three-dimensional surface morphology of CZO as figure 2 It can be seen from the AFM-3D diagram that the number of prepared nanoparticles is affected by t...

Embodiment 3

[0036] 1) Prepare scratches on the LAO single crystal substrate with a nanoindenter, where the indentation force is 0.6mN and the interval is 500nm;

[0037] 2) Dissolve lanthanum acetylacetonate into n-propionic acid to obtain a precursor solution with a concentration of 0.03mol / L;

[0038] 3) Apply the precursor solution obtained in step 2) to the single crystal substrate processed in step 1) by spin coating, the rotation speed is 6000rpm, and the time is 200s to obtain the precursor film;

[0039] 4) Under the protection of Ar gas, the precursor film obtained in step 3) was sintered at 1300°C for 200 minutes to obtain La 2 o 3 nano dots.

[0040] 5) La 2 o 3 The line scan diagram is as follows image 3 As shown, the nanoparticles are about 5 nm high and spaced about 500 nm apart, which is comparable to the pitch of the indentation.

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Abstract

The invention relates to a surface modification method of a transitional layer capable of normalizing boundary nano-particles, belonging to the technical field of high-temperature superconducting materials. The method comprises the following steps: pre-scratching a certain amount of scratches on the surface of a deposition basal plate as the nucleation center so as to effectively control the amount of particles; effectively limiting the particle size by adjusting the intervals of the scratches to prevent the particles from aggregating, after preparing a precursor liquid by adopting a chemical liquor method, coating the precursor liquid to single crystal substrates with different angles by a spin-coating method, and then obtaining shape-controllable nano points on the surfaces of single crystals through a thermal treatment process; adjusting the directions of the deposition faces of the single crystal substrates of the transitional layers, wherein the step flows generated buy sintering are taken as the nucleation centers of the particles so as to control the amount of the particles; and adjusting the particle size and dispersity according to size of the step so as to provide a high-performance engineering surface for the high-temperature superconducting material with the controllable surface according to demand.

Description

technical field [0001] The invention belongs to the technical field of high-temperature superconducting material preparation, and in particular relates to a preparation technology for surface modification of a high-temperature superconducting coating conductor transition layer. Background technique [0002] YBCO high-temperature coated superconducting materials have a wide range of potential applications in electricity, medical equipment, communications, etc. These applications require high-temperature superconductors to have a high critical current, especially under an applied magnetic field. However, YBCO superconductors belong to the second type of superconducting materials. Under an external magnetic field, part of the magnetic flux will pass through the interior, and the flux will creep when the current passes through, resulting in its critical current density (J e ) decreases sharply with the increase of the applied magnetic field. [0003] Studies have shown that by...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/50
Inventor 索红莉徐燕刘敏任程仪宁田辉王毅马麟
Owner 深创超导(深圳)科技有限公司
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