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A kind of preparation method of ultrathin metal shell nanoparticle

A nanoparticle and ultra-thin metal technology is applied in the field of preparation of ultra-thin metal shell nanoparticles to achieve the effects of easy implementation, simple operation and flexible control

Active Publication Date: 2017-04-12
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation of ultra-thin metal-shell nanoparticles is still in a bottleneck state. The shell thickness of the metal-shell nanoparticles prepared by the prior art is generally above 15nm.

Method used

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  • A kind of preparation method of ultrathin metal shell nanoparticle
  • A kind of preparation method of ultrathin metal shell nanoparticle
  • A kind of preparation method of ultrathin metal shell nanoparticle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The preparation of ultra-thin gold-shell silica nanoparticles is carried out according to the following process steps:

[0045] (1) Preparation of silica colloidal microspheres with hydroxyl groups on the surface: Mix 150mL of isopropanol, 60mL of water and 30mL of ammonia water evenly at room temperature, control the stirring speed at 270-300rpm, add 14mL of ethyl orthosilicate dropwise to the system ester, the rate of addition was 1mL / min, the reaction temperature was controlled at 25-30°C, and the reaction time was 30 minutes. The silica colloidal microspheres were obtained by centrifugation. The silica colloidal microspheres were dispersed in ethanol and ultrasonically oscillated for 10 minutes to obtain Hydroxyl silica colloidal microspheres;

[0046] (2) Surface modification of silica colloidal microspheres: add aminopropyltrimethoxysilane dropwise to the ethanol solution of silica colloidal microspheres with hydroxyl groups on the surface, the amount of aminoprop...

Embodiment 2

[0052] The preparation of ultra-thin gold-shell polystyrene nanoparticles is carried out according to the following process steps:

[0053] (1) Preparation of polystyrene colloidal microspheres with hydroxyl groups on the surface: mix 30mL water, 40mL ethanol, 0.5g sodium lauryl sulfate and 0.2g potassium persulfate at room temperature, and control the stirring speed to 270-300rpm, Add 10mL of styrene and 0.5g of divinylbenzene, control the reaction temperature to 50-60°C, and the reaction time is 10h, under nitrogen protection throughout the reaction, centrifuge to obtain polystyrene colloidal microspheres; disperse polystyrene colloidal microspheres in concentrated Sonicate in sulfuric acid for 50 minutes, and centrifuge to obtain polystyrene colloidal microspheres with sulfonic acid groups on the surface;

[0054] (2) Surface modification of polystyrene colloidal microspheres: disperse polystyrene colloidal microspheres with sulfonic acid groups on the surface into ethanol,...

Embodiment 3

[0060] The preparation of the ultra-thin gold shell layer ferric iron tetroxide fusiform colloidal particle is carried out according to the following process steps:

[0061] (1) Preparation of ferric oxide fusiform colloidal particles with hydroxyl groups on the surface: mix water and potassium dihydrogen phosphate evenly at room temperature, wherein the concentration of potassium dihydrogen phosphate in the aqueous solution is 5 × 10 -4 M, control the stirring speed at 270-300rpm, add ferric chloride, control the concentration of ferric chloride in the aqueous solution to 0.05M, control the reaction temperature at 85-90°C, and the reaction time is 36h, centrifuge to obtain the fusiform iron tetraoxide Colloidal particles; disperse ferric oxide fusiform colloidal particles in ethanol and ultrasonically vibrate for 30 minutes to obtain ferric ferric oxide fusiform colloidal particles with hydroxyl groups on the surface, and its scanning electron microscope picture is as follows ...

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Abstract

The invention provides a preparation method of ultra-thin metal shell layer nano-particles. The preparation method includes the process steps that (1) colloid particle kernels with hydroxyl or sulfonyl or carboxyl formed on the surfaces are prepared; (2) the colloid particle kernels with hydroxyl or sulfonyl or carboxyl formed on the surfaces are subjected to surface modification through a surface modifier; (3) gold seeds are prepared; (4) primary gold seed adsorption is conducted on the surfaces of the colloid particle kernels subjected to surface modification; (5) secondary gold seed adsorption is conducted on the surfaces, subjected to primary gold seed absorption, of the colloid particle kernels; and (6) the colloid particle kernels prepared in the step (5) are added to a metal precursor water solution, a metal precursor is reduced through a reducing agent, and finally the ultra-thin metal shell layer nano-particles are obtained. The method is easy to operate and implement; the varieties and the thicknesses of metal shell layers can be flexibly controlled; the prepared ultra-thin metal shell layer nano-particles have good integrity and optical properties; and the thicknesses of the shell layers range from 8 nm to 15 nm and can be adjusted.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and in particular relates to a preparation method of ultrathin metal shell nanoparticles. Background technique [0002] The special surface plasmon resonance (SPR) properties of metal micro-nano materials have become an important part of the field of modern nanophotonics. Designing and preparing metal nanoparticles with special optical properties is a research hotspot in this field. Metal-shell nanoparticles are core-shell nanoparticles with a dielectric colloidal particle as the core and a continuous metal film as the shell. This special structure makes its optical properties very different from traditional nanoparticles. For example, only changing the thickness of the metal shell can realize the wide-spectrum adjustment of the resonant extinction peak of a single nanoparticle from the visible region to the infrared region. The unique properties of metal-shelled nanoparticles make them ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24
Inventor 张学民罗金敏赵雪祁
Owner NORTHEASTERN UNIV LIAONING
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