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Core-shell structured silica @ mesoporous silica supported gold nanoparticle microbead and preparation method of same

A technology of mesoporous silica and gold nanoparticles, applied in the preparation of microspheres, microcapsule preparations, etc., can solve the problems of poor quality of Raman spectra of metal nanostructures, achieve controllable size and shape, and enhance Raman spectra , High stability effect

Inactive Publication Date: 2013-08-14
HEILONGJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the technical problem of the poor quality of the existing metal nanostructure Raman spectrum, and to provide a core-shell structure silica mesoporous silica supported gold nanoparticle microbead and its preparation method

Method used

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  • Core-shell structured silica @ mesoporous silica supported gold nanoparticle microbead and preparation method of same
  • Core-shell structured silica @ mesoporous silica supported gold nanoparticle microbead and preparation method of same
  • Core-shell structured silica @ mesoporous silica supported gold nanoparticle microbead and preparation method of same

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specific Embodiment approach 1

[0035] Specific embodiment one: In this embodiment, the core-shell structure silica mesoporous silica-supported gold nanoparticle microbeads are composed of a core layer and a shell layer, and the core layer is silica spherical nanoparticles; the shell layer It consists of mesoporous silica and gold nanoparticles, and the gold nanoparticles are adsorbed in the mesopores of mesoporous silica.

specific Embodiment approach 2

[0036] Embodiment 2: Embodiment 1 The preparation method of the core-shell structure silica mesoporous silica supporting gold nanoparticle microbeads is as follows:

[0037] 1. Preparation of silica nanoparticles:

[0038] Stir and mix 150-160mL absolute ethanol and 32-38mL ammonia water with a mass concentration of 30% at a speed of 190-210rpm, raise the temperature to 60°C at a rate of 5-10°C / min, and then add 2.2mL of For tetraethyl silicate, keep the temperature of 60°C and the rotation speed of 190-210rpm to continue the reaction for 24h to obtain small silica nanoparticles;

[0039] Two, preparation of silica nano-seeds:

[0040] Stir and mix 150-160mL absolute ethanol and 12-18mL concentrated ammonia water with a mass concentration of 30% at a speed of 200rpm, and add the silicon dioxide obtained in step 1 dropwise in a constant temperature water bath at 25°C with a stirring speed of 200rpm. Nano small particles, react for 15min, then add tetraethyl orthosilicate etha...

specific Embodiment approach 3

[0052] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that in step one, 160mL of absolute ethanol and 36mL of ammonia water with a mass concentration of 30% are stirred and mixed evenly at a speed of 200rpm. The heating rate of °C / min was increased to 60 °C, and then 2.2 mL of tetraethyl orthosilicate was added, and the temperature was maintained at 60 °C and the rotation speed was 200 rpm to continue the reaction for 24 hours to obtain small silica nanoparticles. Others are different from the first or second specific embodiment.

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Abstract

The invention discloses a core-shell structured silica @ mesoporous silica supported gold nanoparticle microbead and a preparation method of the same, relates to the gold nanoparticle microbead and the preparation method of the same, and aims at solving the technical problem of poor quality of Raman spectrum of the existing metal nano structure. The core-shell structured silica @ mesoporous silica supported gold nanoparticle microbead is composed of a core layer and a shell layer. The preparation method comprises the following steps of: preparing small silica nanoparticle; preparing silica nano seeds; preparing core-shell structured silica @ mesoporous silica nanoparticle sol solution; preparing silica @ mesoporous silica nanoparticle; preparing silica @ mesoporous silica nanoparticle of which the shell layer comprises amino groups; preparing the core-shell structured silica @ mesoporous silica supported gold nanoparticle; and preparing the core-shell structured silica @ mesoporous silica supported gold nanoparticle microbead. The microbead prepared by the method is controllable in size and appearance, high in stability and capable of effectively enhancing the Raman spectrum.

Description

technical field [0001] The invention relates to a mesoporous silicon dioxide loaded gold nanoparticle microbead and a preparation method thereof. Background technique [0002] Surface-enhanced Raman spectroscopy (SERS) is a special surface-enhanced optical phenomenon at the nanometer scale. The ideal surface enhancement effect can be obtained by controlling the surface roughness and the size of particles such as sol. For example, transition metals Pt, Rh, Fe, Co and Ni are electrochemically treated to obtain nanoscale rough surfaces, thereby obtaining a series of SERS spectra of organic molecules or inorganic ions; another example is silver or gold with a certain diameter. The surface of nanoparticles exhibits a very high surface enhancement factor, which makes detection at the single-molecule level possible. The breakthroughs above are all related to the nanostructure of the surface, and the development of nanostructure material preparation technology provides abundant exp...

Claims

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Application Information

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IPC IPC(8): B01J13/02
Inventor 孙立国吕莉丽赵冬梅张艳红汪成
Owner HEILONGJIANG UNIV
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