Method for preparing gold/titanium dioxide core-shell nanoparticle

A technology of nanoparticles and core-shell structure, which is applied in the field of preparation of gold/titanium dioxide core-shell structure nanoparticles, can solve the problems of complex synthesis process, harsh reaction conditions, long production cycle, etc., and achieve simple process flow, mild reaction conditions, The effect of the integrity of the shell structure

Inactive Publication Date: 2012-09-19
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Lee et al. [Angew.Chem.Int.Ed.50, 10208, (2011)] used silica as a template to first synthesize gold nanoparticles, then coat the silica shell, and then coat the silica shell The layer is covered with a titanium dioxide shell, and finally the silicon dioxide shell is selectively etched away by sodium hydroxide to obtain a gold/titanium dioxide yolk/shell structure, but this method has a complex synthesis process and a long production cycle; Park et al [Adv. Mater.Vol.20, 1523, (2008)] Utilize the reaction of gold and cyanide to first synthesize gold nanoparticles, coat the silica shell, and then use potassium cyanide to etch away part of the gold nanoparticles. Thus, a gold/silicon dioxide yolk/shell structure is obtained, but the synthesis cost of this method is high, and the etching degr

Method used

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  • Method for preparing gold/titanium dioxide core-shell nanoparticle
  • Method for preparing gold/titanium dioxide core-shell nanoparticle
  • Method for preparing gold/titanium dioxide core-shell nanoparticle

Examples

Experimental program
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Embodiment 1

[0022] 1) Preparation of carbon nanospheres containing gold nuclei

[0023] Dissolve 2g of sugar compounds in 35ml of deionized water to make a 0.289mol / L solution, then add 170μL of 0.0243mol / L chloroauric acid aqueous solution, mix well, and put it into a 50ml polytetrafluoroethylene reaction kettle , reacted under hydrothermal conditions at 180°C for 4 hours, filtered and washed to obtain the product, washed three times with water, then washed three times with alcohol, and then dried at 40°C for 12 hours to obtain carbon nanospheres containing gold nuclei. The diameter of carbon spheres is 160-200nm, and the diameter of gold particles is 20-40nm.

[0024] 2) Titanium dioxide shells are coated on the nanocarbon spheres containing gold nuclei

[0025] Take 0.02g of the prepared gold-nucleated carbon nanospheres, disperse them in 20ml of absolute ethanol, make a 0.1g / L solution, and ultrasonically vibrate for 15 minutes at room temperature, then add 0.2ml of ammonia water, an...

Embodiment 2

[0029] 1) Preparation of carbon nanospheres containing gold nuclei

[0030] Dissolve 4g of sugar compounds in 35ml of deionized water to make a 0.577mol / L solution, then add 170μL of 0.0243mol / L chloroauric acid aqueous solution, mix well, and put it into a 50ml polytetrafluoroethylene reaction kettle , reacted under hydrothermal conditions at 190°C for 3 hours, filtered and washed to obtain the product, washed three times with water, then washed three times with alcohol, and then dried at 40°C for 12 hours to obtain carbon nanospheres containing gold nuclei. Carbon spheres have a diameter of 140-190nm, and gold particles have a diameter of 20-40nm.

[0031] 2) Titanium dioxide shells are coated on the nanocarbon spheres containing gold nuclei

[0032] Take 0.02g of the prepared gold-nucleated carbon nanospheres, disperse them in 20ml of absolute ethanol, make a 0.1g / L solution, and ultrasonically vibrate for 15 minutes at room temperature, then add 0.2ml of ammonia water, an...

Embodiment 3

[0036] 1) Preparation of carbon nanospheres containing gold nuclei

[0037] Dissolve 1g of sugar compound in 35ml of deionized water to make a solution of 0.144mol / L, then add 340μL of 0.0243mol / L chloroauric acid aqueous solution, mix well, and put it into a 50ml polytetrafluoroethylene reaction kettle , reacted under hydrothermal conditions at 200°C for 1 hour, filtered and washed to obtain the product, washed with water three times, then washed with alcohol three times, and then dried at 40°C for 12 hours to obtain carbon nanospheres containing gold nuclei. Carbon spheres have a diameter of 150-300nm, and gold particles have a diameter of 40-60nm.

[0038] 2) Titanium dioxide shells are coated on the nanocarbon spheres containing gold nuclei

[0039] Take 0.02g of the prepared gold-nucleated carbon nanospheres, disperse them in 10ml of absolute ethanol, make a 0.2g / L solution, and ultrasonically vibrate for 15 minutes at room temperature, then add 0.1ml of ammonia water, a...

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Abstract

The invention discloses a method for preparing a core-shell nanoparticle which contains a noble metal core. The method comprises the following processing steps of: (1) preparing a carbon nanosphere which contains noble metal; (2) covering a shell on the outside of the carbon nanosphere which contains the noble metal; and (3) preparing the core-shell nanoparticle which contains the noble metal core. In the step (2), the shell is covered by dissolving the carbon nanosphere which contains the noble metal core in absolute ethyl alcohol, utilizing ammonia to control the hydrolytic speed of tetrabutyl titanate or ethyl orthosilicate, and reacting to obtain the shell covered on the outside of the carbon nanosphere which contains the noble metal. In the step (3), processes of slow heating and low-temperature preservation are adopted for calcination. According to the process, the ammonia is utilized to control the hydrolytic speed of the tetrabutyl titanate or the ethyl orthosilicate, and high-temperature backflow of an organic solvent is not needed so that reaction conditions are milder. The method has the advantages of simple process flow and suitability for industrial production. The noble metal core obtained by using the method has the advantages of uniform size, good granularity and integral shell structure.

Description

technical field [0001] The invention belongs to the field of material chemistry and nanometer materials, in particular to a preparation method of gold / titanium dioxide core-shell nanoparticle. Background technique [0002] With the in-depth development and application of nanotechnology, the synthesis of nanocomposite structures with multiple functions has become an important research focus and development trend in the field of nanoscience. The Yolk / Shell (core / shell) structure is a novel core-shell structure recently studied, which means that there are other particles in an empty shell and there is a gap between the two, and the Yolk / Shell structure The particles are free to move. The Yolk / Shell structure combines the properties of Yolk and Shell. The Shell part has characteristics such as low density and large specific surface area. At the same time, the nanoparticles (such as gold nanoparticles) in the Yolk part also have excellent properties, making them widely used in m...

Claims

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Application Information

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IPC IPC(8): B22F1/02B82Y40/00
Inventor 王戈陈晨日杨穆高鸿毅王倩
Owner UNIV OF SCI & TECH BEIJING
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