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Core-shell structure composite nanometer material and preparation method thereof

A technology of composite nanomaterials and core-shell structure, which is applied in the field of composite nanomaterials with dielectric metal core-shell structure and its preparation, can solve the problems of expensive and restricting the popularization and application of nanomaterials, and achieve simple steps, good economic benefits and promotion value , cheap effect

Inactive Publication Date: 2008-01-09
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

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Experimental program
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Effect test

Embodiment 1

[0025] (1) Prepare SiO by Stber method 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 for 12 hours and reflux for 1 hour, the mixed solution was centrifuged and washed 4-5 times under the condition of 6000 r / m to fully remove the remaining reactants. The BT-2003 laser particle size distribution analyzer was used to measure the 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 high-purity ...

Embodiment 2

[0030] (1) Prepare SiO by Stber method 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 fo...

Embodiment 3

[0035] (1) Prepare SiO by Stber method 2 Nanoparticles, 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 drop by drop, and after continuous stirring for 12h and reflux for 1h, the mixed solution was mixed under the condition of 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 2Nanoparticles 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...

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Abstract

The present invention relates to one kind of composite nanometer material in a core-shell structure including a dielectric core of nanometer SiO2 microsphere and a metal shell of Cu. The process of preparing the composite nanometer material includes: preparing colloidal SiO2 particle, self-assembling nanometer SiO2 sphere array on quartz chip, preparing composite SiO2 / Cu particle array, and ultrasonic separation to obtain nanometer SiO2 / Cu particle in a core-shell structure monodispersed inside solution. The composite nanometer material has surface plasma resonant absorption peak located in near infrared region, optical property in visible light and near infrared regions adjustable by means of controlling the diameter of the core and the thickness of the shell, blue shift with the increased shell thickness and red shift with increased SiO2 size. The nanometer material may find wide application in photocatalysis, sensor, optical information storing 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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IPC IPC(8): B22F1/00B22F9/16C04B35/624
Inventor 满石清张华利
Owner JINAN UNIVERSITY
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