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Preparation method of silica/gold/ silica three-layer nano particles

A technology of gold nanoparticles and silicon dioxide, applied in the direction of coating, etc., to achieve the effect of simple experimental equipment, good dispersion, and easy to master the process

Inactive Publication Date: 2015-02-18
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, with the method of chemical synthesis, it is possible to synthesize core-shell nanoparticles with double-layer photothermal conversion with poor chemical inertness, and to prepare silica / gold / silica three-layer composite nanoparticles with a light-transmitting silica layer. There is no report yet, and there is no report on the preparation of this type of three-layer composite material by chemical synthesis.

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  • Preparation method of silica/gold/ silica three-layer nano particles
  • Preparation method of silica/gold/ silica three-layer nano particles

Examples

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Embodiment 1

[0019] A preparation method of silicon dioxide / gold / silicon dioxide three-layer nanoparticles, comprising the following steps:

[0020] 1) Preparation of silica / gold (core / shell) particle solution, comprising the following steps:

[0021] 1.1) Preparation of silica core particles: add 25mL of absolute ethanol to a 50mL conical flask, stir for 10min at a rotating speed of 500r / min, then add 2.5mL of 10% ammonia solution to it, then Stir for 10min, then adjust the speed of the stirrer to 1000r / min, at the same time add 1.1mL of ethyl orthosilicate to it within 5s and stir for 1min, and finally adjust the speed to 500r / min and continue the reaction for 8h;

[0022] 1.2) Amination modification of silica core particles: after the particles obtained in step 1.1) were washed three times with absolute ethanol, they were prepared into 25 mL of ethanol solution, and 20 uL of (3-aminopropyl) trimethoxy was added to the solution. Then, the solution was diluted with ethanol to 125 mL, an...

Embodiment 2

[0030] A preparation method of silicon dioxide / gold / silicon dioxide three-layer nanoparticles, comprising the following steps:

[0031] 1) Preparation of silica / gold (core / shell) particle solution, comprising the following steps:

[0032] 1.1) Preparation of silica core particles: add 25mL of absolute ethanol to a 50mL conical flask, stir for 10min at a rotating speed of 500r / min, then add 2.5mL of 10% ammonia solution to it, then Stir for 10min, then adjust the speed of the stirrer to 1000r / min, at the same time add 1.1mL of ethyl orthosilicate to it within 5s and stir for 1min, and finally adjust the speed to 500r / min and continue the reaction for 8h;

[0033] 1.2) Amination modification of silica core particles: after the particles obtained in step 1.1) were washed three times with absolute ethanol, they were prepared into 25 mL of ethanol solution, and 20 uL of (3-aminopropyl) trimethoxy was added to the solution. Then, the solution was diluted with ethanol to 125 mL, an...

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Abstract

The invention provides a preparation method of silica / gold / silica three-layer nano particles. The preparation method comprises the following steps: after performing amination modification on silica nuclear particles, absorbing nano gold particles; then putting in a gold hydroxide aqueous solution, adding formaldehyde used as a reducing agent and performing oxidation reduction reaction so as to form a gold shell; performing surface finishing on silica / gold double-layer core-shell particles by use of heavy polymer polyvinyl pyrrolidone; performing centrifugal cleaning, and adding a silicon source for growing a transparent silica layer and a catalyst, thereby preparing the silica / gold / silica three-layer nano particles. Raw materials used in the preparation method are easily available, required experimental equipment is simple, the technical process is easy to master, and the preparation method can be used for preparing compound particles with favorable dispersibility and uniform light-transmitting layer.

Description

technical field [0001] The invention belongs to the technical field of structured nanomaterials, and particularly relates to a preparation method of silicon dioxide / gold / silicon dioxide three-layer nanoparticles. Background technique [0002] Nanoparticles, as zero-dimensional nanomaterials, have unique optical, thermal, and electrical properties, and have broad application prospects in nanophotonics, nanobiomedicine, and solar cells. Silica / gold / silicon dioxide three-layer composite nanoparticles have the function of photothermal conversion in the physiological band, and can be used as a thermotherapy material in biomedicine. At present, chemical synthesis methods can be used to synthesize double-layer photothermal conversion core-shell nanoparticles with poor chemical inertness, and prepare silica / gold / silica three-layer composite nanoparticles with light-transmitting silica layer. There are no reports of or the preparation of such three-layer composites by chemical synth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/02
Inventor 江新兵李本强于伟张漫漫丁秋玉
Owner XI AN JIAOTONG UNIV
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