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Hollow core shell structure Au@TiO2 nano-composite material and preparation method thereof

A nanocomposite material, core-shell structure technology, applied in the field of hollow core-shell structure AuTiO2 nanocomposite material and its preparation, can solve the problems of complex synthesis steps, difficult to wash clean, cumbersome experimental operations, etc., and achieve the effect of simple steps

Inactive Publication Date: 2013-08-21
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The synthesis steps of this sacrificial template method are complex, the experimental operation is cumbersome, and the impurity Na introduced during the etching process + Ions are difficult to wash clean, and Na + Ions have a passivation effect on the catalyst
So far, hollow AuTiO has been prepared by a template-free method 2 Nanocomposites with core-shell structure have not been reported yet

Method used

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  • Hollow core shell structure Au@TiO2 nano-composite material and preparation method thereof
  • Hollow core shell structure Au@TiO2 nano-composite material and preparation method thereof
  • Hollow core shell structure Au@TiO2 nano-composite material and preparation method thereof

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preparation example Construction

[0023] The invention provides a hollow core-shell structure AuTiO 2 A method for preparing a nanocomposite, wherein the method comprises the following steps:

[0024] 1) preparing a colloidal solution of Au nanoparticles with a particle size of 3 to 7 nm;

[0025] 2) After first contacting the colloidal solution of Au nanoparticles obtained in step 1) with the mixed solution of alcohol and water with 1-4 carbon atoms, and then carrying out the second contact with the titanium source, the product after the second contact For hydrothermal crystallization, the titanium source is one or more of titanium tetrafluoride, tetrabutyl titanate and titanium trichloride.

[0026] According to the preparation method of the present invention, the content of Au nanoparticles in the colloidal solution of Au nanoparticles obtained in step 1) can be changed within a wide range. Generally, the content of Au nanoparticles in the colloidal solution of Au nanoparticles obtained in step 1) can be ...

Embodiment 1

[0048] 1) At 25°C, measure 190 mL of distilled water and place it in a 250 mL round-bottomed flask. After magnetically stirring for 5 minutes, add 5 mL of HAuCl dropwise into the round-bottomed flask 4 Aqueous solution (concentration is 10mmol / L), after magnetic stirring for 10min, add dropwise 5mL sodium citrate aqueous solution (concentration is 10mmol / L) to the round bottom flask, after magnetic stirring for 10min, add 3.0mL hydroboration to the round bottom flask instantly Sodium aqueous solution (concentration is 0.1mol / L), after continuing to stir at 25°C for 12 hours, a colloidal solution of Au nanoparticles of 3 to 7 nm can be obtained, wherein the content of Au nanoparticles in the colloidal solution of Au nanoparticles is 0.00485% by weight . Drop the colloidal solution of Au nanoparticles on the copper grid, and after air-drying, observe and take pictures with a transmission electron microscope, and obtain the transmission electron microscope photos of the Au nanopa...

Embodiment 2

[0051] Carry out according to the method in embodiment 1, difference is step 2) TiF 4 The amount of solution used is such that TiF 4 The molar amount added is 100 times the molar amount of Au nanoparticles in the Au colloid solution. Finally, the hollow core-shell structure AuTiO 2 nanocomposites. Its X-ray powder diffraction pattern ( figure 2 In b) shows AuTiO 2 Nanocomposites do contain Au and TiO 2 The characteristic diffraction peak; Scanning electron micrograph ( Figure 4 ) shows that the composite material presents a spherical morphology; transmission electron micrographs ( Figure 7 ) and high-angle dark-field scanning transmission electron microscopy ( Figure 10 ) shows that the edge of the sphere is darker, and the inner color of the sphere is lighter, that is, the interior is a cavity, indicating that the composite material is a hollow structure, and Au nanoparticles are coated on the hollow TiO 2 inside the cavity, through Figure 10 As shown, the shell...

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Abstract

The invention provides a hollow core shell structure Au@TiO2 nano-composite material and a preparation method thereof. The preparation method includes the steps: preparing colloidal solution of Au nano-particles with the particle size of 3-7nm; and firstly contacting the obtained colloidal solution of the Au nano-particles with alcohol and water mixed liquor with 1-4 carbon atoms, secondly contacting the colloidal solution with a titanium source, and performing hydrothermal crystallization for a product after second contact, wherein the titanium source includes one or more of titanium tetrafluoride, tetrabutyl titanate and titanium trichloride. The preparation method has simple steps, and template agents are omitted.

Description

technical field [0001] The invention relates to a hollow core-shell structure AuTiO 2 Nanocomposites and methods for their preparation. Background technique [0002] Nanomaterials with core-shell structure have attracted much attention due to their special optical, electrical, magnetic, and catalytic properties due to their different composition, size, and structural arrangement. However, currently AuTiO designed for the catalytic oxidation of CO 2 There are few research reports on core-shell materials. Zeng Huachun et al. (Angew.Chem.Int.Ed., 2005, 44, 4342-4345.) and Zhang Shoumin et al. (Catal.Commun., 2010, 11, 1003-1007.) successfully achieved AuTiO 2 Synthesis of core-shell catalysts. Although the catalyst solves the problem that the Au particles will not be aggregated due to falling off from the support during the reaction, the TiO 2 The shell is a solid shell, and the mass transfer efficiency of the pores is low, which limits the diffusion of reaction molecules ...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/02B01J13/02B82Y40/00B82Y30/00
Inventor 齐健唐智勇
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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