Preparation method of carbon-coated gold-doped tin dioxide composite material

A technology of tin dioxide and composite materials, applied in the preparation/purification of carbon, tin oxide, metal material coating technology, etc., can solve the problems of low sensitivity of tin dioxide, high optimal response temperature, and small optimal response value To achieve the effect of improving the adsorption capacity and transmission capacity, increasing the maximum response value, and enhancing the gas-sensing performance

Inactive Publication Date: 2019-03-08
DONGGUAN UNIV OF TECH
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AI Technical Summary

Problems solved by technology

[0003] Tin dioxide is one of the earliest researched semiconductor gas sensor materials. During its decades of development, its good electrical conductivity, crystal structure and applicability have made it the research and application field in the field of semiconductor gas sensors. However, due to the single material and small specific surface area of ​​pure tin dioxide gas-sensitive materials, the optimum response temperature is high and the optimum response value is small, resulting in the low sensitivity of a single tin dioxide, which is difficult to meet actual needs, and the preparation process Complex, time-consuming and labor-intensive, high cost, therefore, providing a preparation method of tin dioxide and doping and wrapping is one of the effective ways to increase its gas-sensing performance

Method used

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  • Preparation method of carbon-coated gold-doped tin dioxide composite material
  • Preparation method of carbon-coated gold-doped tin dioxide composite material
  • Preparation method of carbon-coated gold-doped tin dioxide composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-4

[0022] A method for preparing a carbon-wrapped gold-doped tin dioxide composite material, comprising the steps of:

[0023] S1. Preparation of tin dioxide: Add the ammonia solution into the tin protochloride aqueous solution, stir evenly, add it into the polytetrafluoroethylene reaction kettle, carry out the hydrothermal reaction, after the reaction is completed, obtain the solid through centrifugation , and then washed with deionized water until neutral, rinsed with ethanol, placed in an oven, and dried at a constant temperature to prepare tin dioxide;

[0024] S2. Preparation of gold-doped tin dioxide: add the tin dioxide prepared in step S1 into deionized water, and stir evenly. During the stirring process, add chloroauric acid solution and ammonia solution, chloroauric acid and ammonia water add The ratio of volume to deionized water is 1:3:6. After continuous stirring, the solid is obtained by centrifugation, and then washed with deionized water until neutral, then rinsed...

Embodiment 1

[0036] The tin dioxide SEM figure that step S1 prepares in embodiment 1 is as follows figure 2 Shown in middle a, as can be seen from the SEM figure, the prepared tin dioxide has a larger specific surface area, and the prepared tin dioxide has a uniform size; the prepared tin dioxide X-ray diffraction pattern is as follows image 3 As shown, it can be seen from the X-ray diffraction pattern that all the main diffraction peaks (110), (101), (200), (211), (220), (002), (310), (112), (301 ), (202), (321) are consistent with the standard spectrum, and no miscellaneous peaks appear, indicating that the prepared tin dioxide is pure phase tin dioxide without impurities.

[0037] The TEM figure of the gold-doped tin dioxide prepared in step S2 in Example 1 is as follows figure 2 As shown in middle b, it can be seen from the TEM image that the gold particles generated on the surface of tin dioxide are uniform in size and uniformly dispersed on the surface of tin dioxide without aggl...

Embodiment 5

[0040] The carbon-wrapped gold-doped tin dioxide composite materials prepared in Examples 1-4 were respectively placed in an agate mortar, and an appropriate amount of deionized water was added to grind them into a homogeneous and fine slurry, and then coated on trioxide On the aluminum-based gold finger electrode, the sensing layer of the gas sensor is prepared by coating about 100um. After coating, it is dried in the shade, and then placed in the gas sensitivity tester to assemble a complete circuit to form a complete The gas sensor device was subjected to current aging for 24 hours, and the gas sensor prepared by the carbon-wrapped gold-doped tin dioxide composite material prepared in Examples 1-4 was tested for its gas sensitivity response to 100 ppm formaldehyde from 50°C to 230°C.

[0041] Figure 4 The line graph of the gas sensitivity response to 100ppm formaldehyde of the gas sensor prepared for the carbon-wrapped gold-doped tin dioxide composite material prepared in ...

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Abstract

The invention belongs to the field of a gas sensor, and particularly relates to a preparation method of a carbon-coated gold-doped tin dioxide composite material. Firstly, ammonia water is added intoa tin dichloride water solution; stirring, hydrothermal reaction, centrifugation, washing and drying are sequentially performed to obtain tin dioxide; secondly, the tin dioxide is added into water; stirring is performed; chloroauric acid and ammonia water are added; centrifugation, washing, drying and roasting are performed to prepare gold-doped tin dioxide; finally, the gold-doped tin dioxide isadded into helium gas; the temperature is raised; the temperature is constant; acetylene is introduced; meanwhile, helium gas is introduced; the temperature lowering and annealing treatment is performed; the carbon-coated gold-doped tin dioxide composite material is prepared. The preparation method is simple; the cost is low; the prepared carbon-coated gold-doped tin dioxide composite material hasthe large specific surface area; through the gold doping and carbon coating, the gas sensitive characteristics of the composite material is greatly improved; the optimum response temperature is reduced; the maximum response value is improved; good gas sensitive performance is realized.

Description

technical field [0001] The invention belongs to the field of gas sensors, and in particular relates to a preparation method of a carbon-wrapped gold-doped tin dioxide composite material. Background technique [0002] With the development of human society, environmental issues are increasingly concerned by people. The detection of air quality is one of the important issues. Gas sensors are becoming more and more important. Therefore, the application of gas sensors is becoming more and more extensive. They are often used in The detection of air pollutants sulfur dioxide, nitrogen dioxide, carbon monoxide and volatile organic pollutants, as well as the detection of leaked gas in the production process and the determination of indoor air pollutants in life, semiconductor metal oxide gas sensors have high sensitivity and low consumption Therefore, it is of great significance and value to vigorously develop new high-performance semiconductor gas-sensitive materials. [0003] Tin ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G19/02C01B32/05B22F9/24C23C16/26G01N33/00
CPCG01N33/0047C23C16/26C01B32/05C01G19/02B22F9/24C01P2002/72C01P2004/03C01P2004/04
Inventor 徐进谢春晓
Owner DONGGUAN UNIV OF TECH
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