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Core-shell structure composite nanometer material and preparation method thereof

A composite nanomaterial and core-shell structure technology, which is applied in the field of dielectric metal core-shell structure composite nanomaterials and their preparation, can solve the problems of limiting the popularization and application of nanomaterials, being expensive, and achieve good economic benefits and popularization value, and the steps are simple and convenient. , the preparation method is simple

Inactive Publication Date: 2009-07-22
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the research on core-shell nanomaterials with reduced symmetry is mainly concentrated in the range of gold and silver precious metal materials, but the expensive price of precious metal materials limits the popularization and application of nanomaterials to a certain extent.

Method used

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  • Core-shell structure composite nanometer material and preparation method thereof
  • Core-shell structure composite nanometer material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) use Method to prepare SiO 2 Nanoparticles, 20mL of water and 50mL of absolute ethanol as a solvent, mixed with 5mL of ethyl orthosilicate evenly under the action of magnetic stirring, then added about 10mL of ammonia water drop by drop, a few minutes after the reaction started, milky white gradually appeared in the solution, indicating that SiO 2 Nanoparticles began to form. After stirring continuously for 12 hours and refluxing for 1 hour, the mixed solution was centrifuged and washed 4-5 times under the condition of 6000r / m to fully remove the remaining reactants. The BT-2003 laser particle size distribution analyzer was used to measure SiO 2 The particle size of the nanoparticles is 200nm. Finally SiO 2 Nanoparticles were dispersed in 20 mL of absolute ethanol to make SiO 2 Sol spare.

[0026] (2) Soak the quartz plate in a mixture of concentrated sulfuric acid and hydrogen peroxide with a volume ratio of 7:3 for 3 hours, then ultrasonically clean it with hi...

Embodiment 2

[0030] (1) use Method to prepare SiO 2 Nanoparticles, 20mL of water and 50mL of absolute ethanol as a solvent were mixed with 3, 5, 8, and 15mL of ethyl orthosilicate under the action of magnetic stirring, and then about 10mL of ammonia water was added drop by drop. After continuous stirring for 12 hours and reflux for 1 hour, the The mixed solution was centrifuged and washed 4-5 times under the condition of 6000r / min to fully remove the remaining reactants, and the BT-2003 laser particle size distribution analyzer was used to measure SiO 2 The diameters of the nanoparticles are about 120, 200, 300, 500 nm, respectively. Finally SiO 2 Nanoparticles were dispersed in 20 mL of absolute ethanol to make SiO 2 Sol spare.

[0031] (2) Soak the quartz plate in a mixture of concentrated sulfuric acid and hydrogen peroxide with a volume ratio of 6:4 for 2 hours, then ultrasonically clean it with high-purity water and absolute ethanol, and then bake it in a drying oven at 110°C for...

Embodiment 3

[0035] (1) use Method to prepare SiO 2Nanoparticles, 20mL of water and 50mL of absolute ethanol were mixed with 5mL of ethyl orthosilicate evenly under the action of magnetic stirring, and then 10mL of ammonia water was added dropwise, stirring was continued for 12h and refluxed for 1h, and the mixture was mixed at 6000r / min Centrifuge and wash 4-5 times to fully remove the remaining reactants, and use BT-2003 laser particle size distribution analyzer to measure SiO 2 The particle size of the nanoparticles is 200nm. Finally SiO 2 Nanoparticles were dispersed in 20 mL of absolute ethanol to make SiO 2 Sol spare.

[0036] (2) Soak the quartz plate in a mixture of concentrated sulfuric acid and hydrogen peroxide with a volume ratio of 8:2 for 4 hours, then ultrasonically clean it with high-purity water and absolute ethanol, and then bake it in a drying oven at 130°C for 1 hour. Put the quartz slice on the KW-4A desktop glue homogenizer, drop about 50μL of SiO 2 The sol was...

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Abstract

The invention relates to a composite nano material with a core-shell structure, which comprises a dielectric core and a metal shell, the dielectric core is SiO2 nano microspheres, and the metal shell is a Cu shell. The preparation method comprises: preparing SiO2 colloidal particles by Stber method; array of self-assembled SiO2 nanospheres on quartz sheet; preparing SiO2 / Cu composite particle array; ultrasonic separation to obtain monodispersed SiO2 / Cu core-shell nanoparticle in solution. The surface plasmon resonance absorption peak of the obtained composite nanoparticles is located in the near-infrared region. By controlling the difference between the diameter of the inner core and the thickness of the outer layer, the optical properties can be adjusted in the visible and near-infrared region. Blue shift occurs with the increase of SiO2 particle size, and red shift occurs with the increase of SiO2 particle size. It provides broad prospects for the application of nanomaterials in photocatalysis, sensors, optical information storage, biophotonics, biomedicine and other fields.

Description

technical field [0001] The invention relates to a nano material and a preparation method of the material, in particular to a dielectric metal core-shell structure composite nano material with reduced symmetry and a preparation method thereof. Background technique [0002] In recent years, core-shell composite nanomaterials are gradually becoming a research hotspot in the field of nanotechnology. Since the structure and composition of core-shell composite particles can be tailored and designed at the nanometer scale, they have many unique physical and chemical properties, such as optical, electrical, magnetic, and catalytic, which are different from single-component particles. At present, there are many types of core-shell structure composite particles involved in research at home and abroad, mainly including semiconductor core-semiconductor shell, metal core-metal shell, semiconductor core-metal shell dielectric, plasma core-metal shell and other types of composite particles...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00B22F9/16C04B35/624
Inventor 满石清张华利
Owner JINAN UNIVERSITY
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