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Method for synthesizing macronucleus-silica-coated gold core-shell structure nanoparticles

A gold nanoparticle and silicon dioxide technology, which is applied in the synthesis field of large-core silica-coated gold-core-shell structure nanoparticles, can solve problems such as long preparation period, and achieve the effects of good chemical compatibility and wide application prospect.

Inactive Publication Date: 2011-06-01
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the whole preparation cycle is relatively long, and it takes 2 to 3 days
In addition, the particle size of the core gold nanoparticles used in the existing method is below 50nm

Method used

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  • Method for synthesizing macronucleus-silica-coated gold core-shell structure nanoparticles
  • Method for synthesizing macronucleus-silica-coated gold core-shell structure nanoparticles
  • Method for synthesizing macronucleus-silica-coated gold core-shell structure nanoparticles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) Synthetic gold species

[0027] Add 99ml of water to a 250ml single-mouthed round bottom flask, then add 1.2ml of 24.28mM chloroauric acid solution, heat, and after reflux, add 1ml of 1% sodium citrate solution. Continue heating for 30min to obtain 40nm gold species (see figure 1 ).

[0028] 2) The gold species was further grown to 130nm by the reduction method of hydroxylamine hydrochloride

[0029] Take 4ml of gold species into a single-mouth 250ml round-bottom flask, add 83ml of water, stir, then add 1ml of sodium citrate with a mass fraction of 1%, then add 0.9ml of chloroauric acid solution with a concentration of 24.28mM, stir for 5min, and finally add 1.4 ml of hydroxylamine hydrochloride solution with a concentration of 10 mM, and continue to stir for 30 min. Promptly synthesized the gold particle of 130nm (see figure 2 ).

[0030] 3) Synthesis of Au@SiO 2 particle

[0031] Take 2ml of sodium silicate solution with a mass fraction of 27% to a 100ml vo...

Embodiment 2

[0034] 1) Synthetic gold species

[0035] Add 99ml of water into a 250ml single-mouthed round bottom flask, then add 1.2ml of chloroauric acid solution with a concentration of 24.28mM, heat, and after reflux, add 3ml of sodium citrate solution with a mass fraction of 1%, and continue heating for 30min to obtain 16nm gold species.

[0036] 2) The gold species was further grown to 80nm by the reduction method of hydroxylamine hydrochloride

[0037] Take 4ml of gold species into a single-mouth 250ml round bottom flask, then add 190ml of water, stir, then add 3ml of sodium citrate with a mass fraction of 5%, then add 5ml of chloroauric acid solution with a concentration of 24.28mM, stir for 5min, and finally slowly add 1ml of 30mM hydroxylamine hydrochloride solution was stirred for 30min to obtain 80nm gold particles.

[0038] 4) Synthesis of Au@SiO2 particles

[0039] Take 2ml of sodium silicate solution with a mass fraction of 27% to a 100ml volumetric flask, add 60ml of water...

Embodiment 3

[0042] 1) Synthetic gold species

[0043] Add 99ml of water in the 250ml round-bottomed flask of single port, then add the chloroauric acid solution of 1.2ml concentration 24.28mM, heat, after reflux, add the sodium citrate solution of 0.65ml mass volume fraction 1%, continue heating 30min, can obtain 60nm gold species.

[0044] 2) The gold species was further grown to 200nm by the reduction method of hydroxylamine hydrochloride

[0045] Take 4ml of gold species into a single-mouthed 100ml round-bottom flask, add 44ml of water, stir, then add 5ml of sodium citrate with a mass fraction of 1%, then add 1.4ml of chloroauric acid solution with a concentration of 24.28mM, stir for 5min, and finally add 20ml of 1.5mM hydroxylamine hydrochloride solution, continue to stir for 30min, that is to synthesize 200nm gold particles.

[0046] 4) Synthesis of Au@SiO 2 particle

[0047] Take 2ml of sodium silicate solution with a mass fraction of 27% to a 100ml volumetric flask, add 20ml o...

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Abstract

The invention discloses a method for synthesizing macronucleus-silica-coated gold core-shell structure nanoparticles, relating to core-shell structure nanoparticles. The method has a simple synthesis process, a short period and a high yield, and the prepared core gold nanoparticles have large particle sizes. The cores of the macronucleus-silica-coated gold core-shell structure nanoparticles are gold nanoparticles with a particle size of 80 to 200 nm; an external layer is silica with a particle size of 1 to 20 nm. The method comprises: firstly, synthesizing gold nanoparticles with a particle size of 12 to 60 nm; then using the gold nanoparticles with a particle size of 12 to 60 nm as seeds to synthesize gold nanoparticles with a particle size of 80 to 200 nm; finally, synthesizing silica shell layers with a particle size of 1 to 20 nm on surfaces of the gold nanoparticles with a particle size of 80 to 200 nm. The synthesis method of the invention is widely used in electro-catalysis, bio-sensing, bio-imaging and surface enhanced raman technology.

Description

technical field [0001] The invention relates to a nanoparticle with a core-shell structure, in particular to a method for synthesizing a large-core silica gold-coated core-shell structure nanoparticle. Background technique [0002] Nanotechnology is a new technology that emerged in the late 1980s, and has broad application prospects in many fields such as materials, optics, chemicals, medicine, and life sciences. One of the core keys of nanotechnology is the synthesis method of nanoparticles. Nanomaterials with different compositions and shapes obtained through different synthesis methods have unique physical and chemical properties. These novel nanomaterials can greatly deepen and expand the application fields of nanotechnology. It should be pointed out that there is a very special class of nanostructured materials in the field of nanomaterials, that is, core-shell composite nanomaterials. Since the core-shell nanoparticles have the advantages of both the core and the she...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/02
Inventor 田向东田中群李剑锋周勇亮
Owner XIAMEN UNIV
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