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Core-shell Au@TiO2 nano-particles and preparation method thereof

A nanoparticle, core-shell technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as low solar utilization, achieve uniform particle size, controllable shape, The effect of large specific surface area

Inactive Publication Date: 2016-05-04
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But TiO 2 It can only absorb ultraviolet light, while the energy of sunlight is mainly concentrated in the visible and infrared bands, so its solar utilization rate is very low

Method used

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  • Core-shell Au@TiO2 nano-particles and preparation method thereof
  • Core-shell Au@TiO2 nano-particles and preparation method thereof
  • Core-shell Au@TiO2 nano-particles and preparation method thereof

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Experimental program
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Embodiment 1

[0032] (1) Prepare 0.3ml (0.01M) tetrachloroauric acid aqueous solution;

[0033] (2) Add 4.5ml (0.01M) sodium citrate aqueous solution, stir vigorously with a magnetic stirrer for 2min;

[0034] (3) Use a medical infusion set to add 6ml (0.01M) ascorbic acid aqueous solution drop by drop at a constant speed, and continue stirring with a magnetic stirrer for 5 minutes;

[0035] (4) Then add 6ml (0.04M) titanium tetrafluoride aqueous solution, after it is mixed evenly, add distilled water to dilute to 80ml;

[0036] (5) Then transfer to a stainless steel reaction kettle lined with polytetrafluoroethylene, heat in an electric furnace for 48h (heating temperature 180°C, heating rate 1°C / min), and finally cool down to room temperature naturally;

[0037] (6) Wash 4 times with deionized water, and then dry in a drying oven at 80°C to obtain AuTiO with a core-shell structure with a small core and almost no core, and a shell thickness of about 200 nm. 2 Nanoparticles ( figure 2 )...

Embodiment 2

[0039] (1) Prepare 2ml (0.01M) tetrachloroauric acid aqueous solution;

[0040] (2) Add 4.5ml (0.01M) sodium citrate aqueous solution and stir vigorously with a magnetic stirrer for 2 minutes;

[0041] (3) Use a medical infusion set to add 6ml (0.01M) ascorbic acid aqueous solution drop by drop at a constant speed, and continue stirring with a magnetic stirrer for 5 minutes;

[0042] (4) Then add 6ml (0.04M) titanium tetrafluoride aqueous solution, after it is mixed evenly, add distilled water to dilute to 80ml;

[0043] (5) Then transfer to a stainless steel reaction kettle lined with polytetrafluoroethylene, heat in an electric furnace for 48h (heating temperature 180°C, heating rate 1°C / min), and finally cool down to room temperature naturally;

[0044] (6) Wash 4 times with deionized water, and then dry in a drying oven at 80°C to obtain a core-shell structure AuTiO with a core diameter of 40-60 nm and a shell thickness of 160-200 nm. 2 Nanoparticles ( image 3 ).

Embodiment 3

[0046] (1) Prepare 4.5ml (0.01M) tetrachloroauric acid aqueous solution;

[0047] (2) Add 4.5ml (0.01M) sodium citrate aqueous solution and stir vigorously with a magnetic stirrer for 2 minutes;

[0048] (3) Use a medical infusion set to add 1.2ml (0.01M) ascorbic acid aqueous solution drop by drop at a constant speed, and continue stirring with a magnetic stirrer for 5 minutes;

[0049] (4) Then add 6ml (0.04M) titanium tetrafluoride aqueous solution, after it is mixed evenly, add distilled water to dilute to 80ml;

[0050](5) Then transfer to a stainless steel reaction kettle lined with polytetrafluoroethylene, heat in an electric furnace for 48h (heating temperature 180°C, heating rate 1°C / min), and finally cool down to room temperature naturally;

[0051] (6) Wash 4 times with deionized water, and then dry in a drying oven at 80°C to obtain a core-shell structure AuTiO with a core diameter of about 200 nm and a shell thickness of about 300 nm. 2 Nanoparticles;( Figure ...

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Abstract

The invention discloses core-shell Au@TiO2 nano-particles and a preparation method thereof. Cores of the nano-particles are made of Au, and shells of the nano-particle are made of TiO2. The preparation method of the core-shell Au@TiO2 nano-particles includes the following steps that (1) 0.3-6 ml of a 0.01M tetrachloroauric acid aqueous solution is prepared; (2) 4.5 ml of a 0.01M sodium citrate aqueous solution is added, and the mixture is stirred for 2 min; (3) 0.3-6 ml of a 0.01M ascorbic acid aqueous solution is added, and the mixture is stirred for 5 min; (4) then 0.5-6 ml of a 0.04M titanium tetrafluoride aqueous solution is added, and the mixture is evenly mixed and then diluted to 80 ml with distilled water added therein; (5) the mixture is transferred to a stainless steel reaction kettle with polytetrafluoroethylene serving as a liner, and the stainless steel reaction kettle is heated for 48 h in an electric furnace and naturally cooled to the room temperature finally; and (6) products are washed with deionized water and dried in a drying oven, so that the Au@TiO2 nano-particles of core-shell structures are obtained. The products obtained by the method are uniform in particle size, large in specific surface area and controllable in shape, and the core-shell structures in different diameters can be obtained.

Description

technical field [0001] The invention relates to a core-shell AuTiO 2 Nanoparticles and methods for their preparation. Background technique [0002] The properties of a single nanoparticle are always limited. With the development of material science and modern engineering, composite materials have gradually become a major trend. The orderly assembled composite nanostructure formed by compounding or covering several single nanoparticles on the micro-nano scale will obtain many new properties in addition to the original properties. Among them, the core-shell structure is widely used in materials, drug delivery, biochemistry, etc. The field has a wide range of applications. [0003] TiO 2 As a semiconductor material, it has been widely used as an efficient photocatalyst in the fields of sewage treatment, air purification, cleaning and sterilization, and solar energy utilization due to its acid and alkali resistance, photochemical corrosion resistance, low cost, non-toxicity,...

Claims

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Application Information

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IPC IPC(8): B22F1/02B22F9/24B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00B22F9/24B22F1/16B22F1/054
Inventor 何玉荣黄健陈梅洁李浩然汪新智
Owner HARBIN INST OF TECH