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Method for preparing precious metal titanium dioxide core-shell structure

A technology of titanium dioxide and core-shell structure is applied in the field of preparation of core-shell structure, which can solve the problems that synthesis is limited by harsh conditions, increase difficulty, and easy to coagulate, and achieves simple preparation method, good repeatability, and monodispersity. good effect

Active Publication Date: 2014-07-23
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

However, because precious metals such as gold rods, platinum rods, etc. are unstable in strong alkaline solutions or at high temperatures, they are easy to coagulate and precipitate, so the synthesis of gold rods, platinum rods, etc. as noble metals and titanium dioxide composite systems is limited by harsh conditions. condition
The controllable synthesis of noble metal titania core-shell structure will further increase the difficulty of synthesis

Method used

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  • Method for preparing precious metal titanium dioxide core-shell structure
  • Method for preparing precious metal titanium dioxide core-shell structure
  • Method for preparing precious metal titanium dioxide core-shell structure

Examples

Experimental program
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Effect test

Embodiment 1

[0051] Embodiment 1 prepares gold rod

[0052] 1) Measure 7.5ml, 100mmol / L cetyltrimethylammonium bromide, 1.65ml water, and 0.25ml, 10mmol / L chloroauric acid into a 20ml serum bottle in a 30°C water bath. After stirring for 5 minutes, add 0.6ml, 10mmol / L newly configured sodium borohydride solution to the serum bottle. After adding sodium borohydride, a brown gold seed solution can be obtained. After stirring for 30 seconds, move it to a water bath at 30°C for 3-5 hours.

[0053] 2) Measure 200ml, 100mmol / L cetyltrimethylammonium bromide solution into a blue cap bottle, add 10ml, 10mmol / L chloroauric acid, 2ml, 10mmol in a water bath at 30°C with vigorous stirring / L silver nitrate, 1.16ml, 1mmol ascorbic acid, after the reaction solution is mixed evenly, add 0.24ml of the seed solution obtained in 1), stir for 1min, put it in a 30°C water bath and let it stand for 12 hours. The aspect ratio of the obtained gold rods can be regulated by adding the volume of silver nitrate. ...

Embodiment 2

[0054] Embodiment 2 prepares platinum nanoparticles

[0055] At 25°C, measure 5ml of water into the serum bottle, then measure 0.2ml, 25mmol / L chloroplatinic acid solution, 1ml, 50mmol / L sodium citrate and 2ml, 30mmol / L ascorbic acid, After stirring evenly, put it into an 80° C. water bath and react for 10 minutes to obtain a colloidal solution of platinum nanoparticles. figure 2 It is a transmission electron microscope picture of platinum nanoparticles prepared in this example.

Embodiment 3

[0056] Example 3 Preparation of Gold Rod Titanium Dioxide Core-Shell Structure

[0057] At 25°C, measure 60ml of water into a serum bottle, then add 2ml of titanium trichloride precursor therein, stir for 2 minutes and mix well. Add 1mol / L, 12ml sodium bicarbonate solution dropwise to the reaction system, bubbles are generated during the reaction, and the pH of the system gradually increases (the pH changes from 1.5 to 5.48 during the dropwise addition). Then add the ligand-exchanged gold rod solution dropwise therein, and the reaction lasts for 10-30 minutes. Finally, the gold rod titania core-shell structure is obtained. After the reaction, the product was centrifuged at 6000r / min for 10 minutes, and the solution in the upper layer was removed to obtain a solid with a core-shell structure. After lyophilization for 12 hours, a solid titanium dioxide core-shell structure was finally obtained. image 3 It is an electron microscope picture of the gold rod titanium dioxide core...

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Abstract

The invention discloses a method for preparing a precious metal titanium dioxide core-shell structure. The method comprises the following steps: (1) preparing a precious metal nano particle colloidal solution; (2) adjusting the pH value of a titanium trichloride solution by adding alkaline matter; (3) adding the solution prepared in the step (1) to the solution obtained in the step (2) and reacting; (4) carrying out solid-liquid separation so as to obtain a nano material with the precious metal titanium dioxide core-shell structure. The preparation method disclosed by the invention is simple and feasible, and is good in repeatability, the prepared core-shell structure is good in monodispersity, and the thickness of a titanium dioxide shell layer can be controlled by adjusting the pH of the reaction system. Therefore, the core-shell structure can be applied to the field of hydrogen production of photocatalytic decomposition of water.

Description

technical field [0001] The present invention relates to a preparation method of a core-shell structure, in particular to a preparation method of a precious metal titanium dioxide core-shell structure. The nano-particles synthesized by the method of the present invention have good monodispersity, and the controllable synthesis of the shell thickness can be achieved. This core-shell structure can be applied to photolysis of water. Background technique [0002] In the 21st century, hydrogen is an efficient and clean energy with great potential. When it burns, it just produces pure water, with the release of a large amount of energy. But the current main way to obtain hydrogen is through reforming oil and gas resources, such as reforming methane. This process is often accompanied by the production of carbon dioxide. From this point of view, the only clean source of hydrogen can only be water. Therefore, finding a clean and renewable energy to drive the water splitting reacti...

Claims

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Application Information

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IPC IPC(8): B01J23/42B01J23/44B01J23/46B01J23/50B01J23/52B01J35/02C01B3/04
CPCY02E60/36
Inventor 马翔唐智勇刘薇
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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