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SiO2-precious metal nano composite material of core-shell structure and preparation method of SiO2-precious metal nano composite material

A technology of nano-composite material and core-shell structure is applied in the field of core-shell structure SiO2@precious metal nano-composite material and its preparation, which can solve problems such as being unfavorable to environmental protection, and achieve the effects of uniform particle size, particle size control, and short growth time.

Inactive Publication Date: 2020-05-12
WEST ANHUI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is the introduction of Sn 4+ , not conducive to environmental protection

Method used

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  • SiO2-precious metal nano composite material of core-shell structure and preparation method of SiO2-precious metal nano composite material
  • SiO2-precious metal nano composite material of core-shell structure and preparation method of SiO2-precious metal nano composite material
  • SiO2-precious metal nano composite material of core-shell structure and preparation method of SiO2-precious metal nano composite material

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Effect test

Embodiment 1

[0044] The core-shell structure SiO proposed by the present invention 2 The preparation method of @Pt nanocomposite material, method step is as follows:

[0045] S1: Preparation of Amino Silica Nanoparticles

[0046] S11: add absolute ethanol and ultrapure water into the container, and stir at room temperature for 5 minutes;

[0047] S12: Add ethyl orthosilicate to the mixed solution of S11, stir for 30 minutes, add ammonia water, and continue stirring for 2 hours;

[0048] S13: Centrifuge the solution stirred in S12, and then wash it twice with ethanol and water respectively to obtain silica nanoparticles;

[0049] S14: Disperse the silicon dioxide nanoparticles obtained in S13 in absolute ethanol, then add 3-aminopropyltriethoxysilane, heat the solution to 6°C, and reflux for 12h;

[0050] S15: Centrifuge the reaction product in S14, wash the product twice with ethanol and water respectively, and dry to obtain amino silicon dioxide nanoparticles.

[0051] S2: Generation ...

Embodiment 2

[0074] The core-shell structure SiO proposed by the present invention 2 The preparation method of @Pt nanocomposite material, method step is as follows:

[0075] S1: Preparation of Amino Silica Nanoparticles

[0076] S11: add absolute ethanol and ultrapure water into the container, and stir at room temperature for 3 minutes;

[0077] S12: Add ethyl orthosilicate to the mixed solution of S11, stir for 20 min, add ammonia water, and continue stirring for 1.5 h;

[0078] S13: Centrifuge the solution stirred in S12, and then wash it twice with ethanol and water respectively to obtain silica nanoparticles;

[0079] S14: Disperse the silica nanoparticles obtained in S13 in absolute ethanol, then add 3-aminopropyltriethoxysilane, heat the solution to 50° C., and reflux for 10 h;

[0080] S15: Centrifuge the reaction product in S14, wash the product twice with ethanol and water respectively, and dry to obtain amino silicon dioxide nanoparticles.

[0081] S2: Generation of Platinum...

Embodiment 3

[0097] The core-shell structure SiO proposed by the present invention 2 The preparation method of @Pt nanocomposite material, method step is as follows:

[0098] S1: Preparation of Amino Silica Nanoparticles

[0099] S11: add absolute ethanol and ultrapure water into the container, and stir at room temperature for 7 minutes;

[0100] S12: Add ethyl orthosilicate to the mixed solution of S11, stir for 40 minutes, add ammonia water, and continue stirring for 2.5 hours;

[0101] S13: Centrifuge the solution stirred in S12, and then wash it twice with ethanol and water respectively to obtain silica nanoparticles;

[0102] S14: Disperse the silica nanoparticles obtained in S13 in absolute ethanol, then add 3-aminopropyltriethoxysilane, heat the solution to 70°C, and reflux for 14h;

[0103] S15: Centrifuge the reaction product in S14, wash the product twice with ethanol and water respectively, and dry to obtain amino silicon dioxide nanoparticles.

[0104] S2: Generation of Pla...

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Abstract

The invention discloses a SiO2-precious metal nano composite material of a core-shell structure and a preparation method thereof. The preparation method comprises the following steps: S1, preparing amino silicon dioxide nano particles; S2, generation of noble metal nanoparticles on the surfaces of the amino silicon dioxide nanoparticles: S21, adding the amino silicon dioxide nanoparticles preparedin S1 into ultrapure water, and performing ultrasonic treatment at room temperature for 2-4 minutes to uniformly disperse the nanoparticles; S22, under an ice bath condition, adding a noble metal acid aqueous solution into the dispersion liquid in the step S21, and stirring for 2-4 minutes; S23, adding sodium citrate into the solution stirred in the step S22, stirring for 2-4 minutes, then addinga NaBH4 solution, and continuously stirring for 4-8 minutes; and S24, carrying out centrifugal treatment on the solution obtained after the reaction in the step S23, and then respectively dissolvingethanol and washing with water twice to obtain the SiO2 and precious metal composite nanoparticles. The composite nanoparticle has very strong absorption strength in an ultraviolet visible region, isan excellent nano-functional composite material, can be used for constructing a detection platform based on electrochemiluminescence or fluorescence resonance energy transfer, and is used for quantitative detection of a target object and the like.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to core-shell structure SiO 2 @Precious metal nanocomposite materials and their preparation methods. Background technique [0002] In addition to the surface and interface of nanoparticles, small size, quantum size, and macroscopic quantum tunneling effect, noble metal nanoparticles are widely used in industrial catalysis, fuel cells, and petroleum due to their high catalytic activity, high corrosion resistance, and special electrical properties. It has broad application prospects in pyrolysis, automobile exhaust treatment, antibacterial materials, biocatalysis, electrochemical sensing and other fields. Due to their high surface energy and severe tendency to agglomerate, ultrafine noble metal nanoparticles often exhibit poor reusability and stability during application. Therefore, it is very necessary to study the preparation of supporting materials with excellent performanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/76G01N21/64G01N21/33G01N23/04G01N23/20C01B33/18B22F1/02B22F1/00B22F9/24
CPCG01N21/76G01N21/64G01N21/33G01N23/04G01N23/20C01B33/18B22F9/24C01P2004/64C01P2004/62C01P2004/32C01P2004/03C01P2004/04B22F1/07B22F1/054B22F1/17
Inventor 代盼盼柯家骏常文贵张宇翔王硕
Owner WEST ANHUI UNIV
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