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Self-reduction preparation method of gold nanoparticle loaded tin dioxide nanoflower gas-sensing material

A technology of gold nanoparticles and tin dioxide, applied in chemical instruments and methods, alkali metal oxides/hydroxides, nanotechnology, etc., can solve problems such as material pollution and difficult experiments, simplify the experimental process, avoid Effects of contamination, increased sensitivity and response time

Active Publication Date: 2019-04-26
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when loading noble metals, it is usually necessary to control the size of the noble metals below 10nm in order to effectively improve its gas-sensing performance, and the experiment is difficult.
In addition, the agglomeration of nanoparticles usually requires the addition of stabilizers to control, making the material subject to a certain degree of contamination

Method used

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  • Self-reduction preparation method of gold nanoparticle loaded tin dioxide nanoflower gas-sensing material
  • Self-reduction preparation method of gold nanoparticle loaded tin dioxide nanoflower gas-sensing material
  • Self-reduction preparation method of gold nanoparticle loaded tin dioxide nanoflower gas-sensing material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Dissolve 10mmol of sodium citrate in 20ml of deionized water, and add 0.12g of sodium hydroxide. Dissolve 5mmol of stannous chloride in 20ml of ethanol. After the two solutions were completely dissolved, the ethanol solution was added to the aqueous solution and stirred at room temperature for 1 h.

[0026] (2) The solution obtained in step (1) was transferred to a 50ml reactor, reacted at 180°C for 12h, and then cooled naturally to room temperature.

[0027] (3) The product obtained in step (2) was centrifuged and washed several times with deionized water and ethanol, and dried at 60° C. for 12 hours to obtain tin trioxide nanoflowers.

[0028] (4) Ultrasonically disperse 0.1 g of the powder obtained in step (3) in 20 ml of deionized water to obtain a suspension.

[0029] (5) Add chloroauric acid solution (concentration: 10 mg / ml) to the suspension obtained in step (4), stir at room temperature for 1 h, and control the atomic ratio of gold and tin to 1:100.

[0...

Embodiment 2

[0034] (1) Dissolve 10mmol of sodium citrate in 20ml of deionized water, and add 0.14g of sodium hydroxide. Dissolve 5mmol of stannous chloride in 20ml of ethanol. After the two solutions were completely dissolved, the ethanol solution was added to the aqueous solution and stirred at room temperature for 1 h.

[0035] (2) The solution obtained in step (1) was transferred to a 50ml reactor, reacted at 180°C for 12h, and then cooled naturally to room temperature.

[0036] (3) The product obtained in step (2) was centrifuged and washed several times with deionized water and ethanol, and dried at 60° C. for 12 hours to obtain tin trioxide nanoflowers.

[0037] (4) Ultrasonically disperse 0.1 g of the powder obtained in step (3) in 20 ml of deionized water to obtain a suspension.

[0038] (5) Add chloroauric acid solution (concentration: 10 mg / ml) to the suspension obtained in step (4), stir at room temperature for 1 h, and control the atomic ratio of gold and tin to 0.5:100.

...

Embodiment 3

[0042] (1) Dissolve 10mmol of sodium citrate in 20ml of deionized water, and add 0.16g of sodium hydroxide. Dissolve 5mmol of stannous chloride in 20ml of ethanol. After the two solutions were completely dissolved, the ethanol solution was added to the aqueous solution and stirred at room temperature for 1 h.

[0043] (2) The solution obtained in step (1) was transferred to a 50ml reactor, reacted at 180°C for 12h, and then cooled naturally to room temperature.

[0044] (3) The product obtained in step (2) was centrifuged and washed several times with deionized water and ethanol, and dried at 60° C. for 12 hours to obtain tin trioxide nanoflowers.

[0045] (4) Ultrasonically disperse 0.1 g of the powder obtained in step (3) in 20 ml of deionized water to obtain a suspension.

[0046] (5) Add chloroauric acid solution (concentration: 10 mg / ml) to the suspension obtained in step (4), stir at room temperature for 1 h, and control the atomic ratio of gold and tin to 1.5:100.

...

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Abstract

The invention discloses a self-reduction preparation method of gold nanoparticle loaded tin dioxide nanoflower gas-sensing material. The method comprises the steps that a citrate sodium aqueous alkaline solution is mixed with a stannous chloride ethanol solution and placed in a reaction kettle to be heated to reach 180 DEG C, reaction is conducted for 12 hours, and floral stannic oxide powder is obtained after a product is washed and dried. The powder is dispersed in deionized water, a chloroauric acid solution is added, the reduction of the stannous oxide is used for reducing the chloroauricacid solution into gold nanoparticles, and the product is washed and dried after being stirred. Finally the gold nanoparticle loaded tin dioxide nanoflower gas-sensing material is obtained after calcination processing is conducted. The method has the advantages that the method is simple, the reaction conditions are mild, the method can be industrialized, prepared tin dioxide nanoflowers have the advantages of uniform size and large specific surface area, the experimental steps are simplified and the cost is reduced compared with a traditional method, the loaded gold nanoparticles have the advantages that the size is uniform, the distribution is uniform and nanoparticles do not aggregate, and more excellent gas-sensing performance on ethanol is shown by the gold particle loaded tin oxide nanoflowers.

Description

technical field [0001] The invention relates to a preparation method of a gas sensing material, which realizes highly sensitive detection of ethanol gas by preparing tin dioxide nanoflowers supported by precious metal particles, and belongs to the technical field of gas detection. Background technique [0002] Tin dioxide is an n-type wide bandgap (3.6eV@300K) semiconductor. Due to its low cost, non-toxicity, easy fabrication, high sensitivity, and long-term stability, it is considered as an excellent gas-sensing material and has been widely used in gas detection. The response value of the sensor device is mainly determined by the reaction of the gas adsorbed on its surface. Therefore, the morphology of the material will be a very important indicator to improve its gas-sensing properties. It has been confirmed that the three-dimensional nanomaterials with hierarchical structure, due to their high specific surface area and porosity, enable the gas to adsorb on the material ...

Claims

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Application Information

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IPC IPC(8): G01N27/12G01N27/26B01J20/28B01J20/06B01J20/02B82Y40/00
CPCB01J20/02B01J20/06G01N27/127G01N27/26B82Y40/00B01J20/28016B01J2220/4806B01J2220/4812B01J2220/42
Inventor 张铭崔艳雷李雪伟王炳荣王如志王波王长昊严辉
Owner BEIJING UNIV OF TECH
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