Method for wrapping gold-silver alloy nanometer particles through silicon dioxide

A gold-silver alloy and nanoparticle technology, which is applied in the field of silica-coated gold-silver alloy nanoparticles, can solve the problems of increased process difficulty and process, long reaction time, and complexity, and achieves short reaction time, simple method, The effect of shape rules

Inactive Publication Date: 2015-12-23
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, silica-coated gold-silver alloy nanoparticles have great research value, but the previously reported methods for silica-coated precious metals are relatively complicated, requiring the addition of stabilizers or dispersants and long reaction times, which undoubtedly increases the Process difficulty and process, and there are no related reports on silica-coated gold-silver alloy particles

Method used

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  • Method for wrapping gold-silver alloy nanometer particles through silicon dioxide
  • Method for wrapping gold-silver alloy nanometer particles through silicon dioxide
  • Method for wrapping gold-silver alloy nanometer particles through silicon dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 1mL of 0.01mol / L silver nitrate aqueous solution and 1mL of 0.01mol / L chloroauric acid aqueous solution into 80mL of boiling distilled water, mix well, then add 8mL of 0.01mol / L sodium citrate aqueous solution, boil for 20 minutes, Centrifuge and wash twice with distilled water, and pour off the supernatant to obtain gold-silver alloy nanoparticles. Add the obtained gold-silver alloy nanoparticles into 45mL of isopropanol, place it in a water bath at 40°C, stir and mix evenly, then add 15mL of deionized water, 1.0mL of ammonia water, 4μL of tetraethyl orthosilicate, 40 ℃ and stirred for 3 hours. After the reaction was completed, it was naturally cooled to room temperature, and washed three times with distilled water and ethanol alternately to obtain SiO 2 Au-Ag alloy@SiO with a shell thickness of 2nm 2 Composite nanoparticles (see figure 1 ).

Embodiment 2

[0025] The preparation method of gold-silver alloy nanoparticles in this example is the same as that in Example 1. Add the obtained gold-silver alloy nanoparticles into 45mL of isopropanol, place it in a water bath at 40°C, stir and mix evenly, then add 15mL of deionized water, 1.5mL of ammonia water, 6 μL of tetraethyl orthosilicate, 40 ℃ and stirred for 3 hours. After the reaction was completed, it was naturally cooled to room temperature, and washed three times with distilled water and ethanol alternately to obtain SiO 2 Au-Ag alloy@SiO with a shell thickness of 5nm 2 Composite nanoparticles (see figure 2 ).

Embodiment 3

[0027] The preparation method of gold-silver alloy nanoparticles in this example is the same as that in Example 1. Add the obtained gold-silver alloy nanoparticles into 45mL of isopropanol, place it in a 40°C water bath, stir and mix evenly, then add 15mL of deionized water, 1.5mL of ammonia water, 9 μL of tetraethyl orthosilicate, 40 ℃ and stirred for 3 hours. After the reaction was completed, it was naturally cooled to room temperature, and washed three times with distilled water and ethanol alternately to obtain SiO 2 Au-Ag alloy@SiO with a shell thickness of 10nm 2 Composite nanoparticles (see image 3 ). From Figure 4 It can be seen from the figure that the Au-Ag alloy nanoparticles are well dispersed, the silica coating is uniform, and the Au-Ag alloy@SiO 2 The core-shell structure is monodisperse composite nanoparticles.

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Abstract

The invention discloses a method for wrapping gold-silver alloy nanometer particles through silicon dioxide. According to the method, isopropyl alcohol serves as a solvent, tetraethyl orthosilicate serves as a silicon source, a stirring reaction is conducted for 1-3 hours at the temperature of 40-60 DEG C by adjusting the proportion of the tetraethyl orthosilicate and the gold-silver alloy nanometer particles, and then the Au-Ag alloy@SiO2 composite nanometer particles wrapped by SiO2 of different thicknesses can be obtained. The method is simple, the reaction condition is gentle, the reaction time is short, no surface active agents need to be added, the prepared Au-Ag alloy@SiO2 composite nanometer particles are high in dispersity and regular in morphology, the thicknesses of silicon dioxide shell layers are uniform and controllable, quite high plasmon resonance peaks are achieved, and adjustable plasmon resonance peaks can be obtained by changing the thicknesses of the silicon dioxide shell layers.

Description

technical field [0001] The invention relates to a method for coating gold-silver alloy nanoparticles with silicon dioxide. Background technique [0002] Gold-silver alloy nanoparticles have special optical properties and catalytic properties, and their plasmon resonance peaks can be linearly adjusted between gold and silver plasmon resonance peaks as the composition changes, not only in biosensing, biomedicine, signal detection and other fields It is widely used and has potential application value as a SERS substrate. However, materials used in the biomedical field require biocompatibility and colloidal stability, and studies on surface-enhanced fluorescence have shown that the distance between the metal substrate and fluorescent molecules strongly affects the intensity of fluorescence. Therefore, modifying the surface of metal nanoparticles and coating them with a shell with biocompatibility, optical transparency and adjustable thickness can greatly expand the application ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24
Inventor 郑海荣张成云韩庆艳严龙翔张明娣
Owner SHAANXI NORMAL UNIV
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