Preparation of pd-sno2 nanocomposite and its application in hydrogen sensor

A nano-composite material, pd-sno2 technology, applied in the analysis of materials, material analysis by electromagnetic means, instruments, etc., can solve the problems of limiting the scope of applications and places of use, poor selectivity, indistinguishable, etc. In adsorption and desorption, good crystallinity, and the effect of preventing aggregation

Active Publication Date: 2020-12-22
河北镭传科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing tin dioxide-based semiconductor gas sensor also has the following problems: (1) poor stability, the average life of the tin dioxide-based semiconductor gas sensor used in industry is less than three years; (2) poor selectivity, In the detection of gas, the electronic characteristics of the existing tin dioxide-based semiconductor gas sensor are not only affected by the gas molecules to be detected but also by other gases, especially when used in a variety of gases with similar physical and chemical properties. When detecting a certain gas in a mixed gas, it is difficult to distinguish; (3) the working temperature is too high, the existing tin dioxide-based semiconductor gas sensor needs to work normally at 200-350 ° C, which greatly limits the Scope of application and place of use

Method used

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  • Preparation of pd-sno2 nanocomposite and its application in hydrogen sensor
  • Preparation of pd-sno2 nanocomposite and its application in hydrogen sensor
  • Preparation of pd-sno2 nanocomposite and its application in hydrogen sensor

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Effect test

Embodiment 1

[0041] The invention provides a Pd-SnO 2 Nanocomposite material, its preparation method is specifically carried out according to the following steps:

[0042] (1) Weigh 3.17g SnCl 2 2H 2 O was dissolved in 20mL ethanol, stirred for 30min to dissolve, and then weighed 0.0125g of PdCl 2 Add 1.5mL 2M hydrochloric acid, dissolve it by ultrasonication for 30min, and then add it to the former. After stirring the mixed solution for 1.5 hours, slowly and evenly add 2g of SBA-15, and vigorously stir at room temperature for 6 hours. After the SBA-15 is completely dissolved, dry the sample at 80°C for 15 hours;

[0043] (2) Grind the sample obtained after drying in step (1) to turn the block sample into powder, then raise the temperature to 550°C at 5°C / min, and calcinate at 550°C for 6h;

[0044] (3) Remove SBA-15 from the sample obtained in step (2) with 60ml 4M NaOH, and stir at room temperature for 4 days;

[0045] (4) Dilute the alkaline solution in step (3) with 1000 mL of dis...

Embodiment 2

[0047] The invention provides a Pd-SnO 2 Nanocomposite material, its preparation method is specifically carried out according to the following steps:

[0048] (1) Weigh 3.17g SnCl 2 2H 2 O was dissolved in 20mL ethanol, stirred for 30min to dissolve, and then weighed 0.013g of PdCl 2 Add 1.5ml of 2M hydrochloric acid, dissolve it by ultrasonication for 30min, and then add it to the former. After stirring the mixed solution for 1.5 hours, slowly and evenly add 2g of SBA-15, and vigorously stir at room temperature for 5 hours. After the SBA-15 is completely dissolved, dry the sample at 80°C for 20 hours;

[0049] (2) Grind the sample obtained after drying in step (1) to turn the block sample into powder, then raise the temperature to 600°C at 3°C / min, and calcinate at 600°C for 4h;

[0050] (3) Remove SBA-15 from the sample obtained in step (2) with 60mL 2M NaOH, and stir at room temperature for 4 days;

[0051] (4) Wash the alkaline solution in step (3) by centrifugation s...

Embodiment 3

[0053] The invention provides a Pd-SnO 2 Nanocomposite material, its preparation method is specifically carried out according to the following steps:

[0054] (1) Weigh 3.17g SnCl 2 2H 2 O was dissolved in 20mL ethanol and stirred for 30min to dissolve it. Then weigh 0.0128g of PdCl 2 Add 1.5ml of 2M hydrochloric acid, dissolve it by ultrasonication for 30min, and then add it to the former. After the mixed solution was stirred for 1.5 hours, 1.8 g of SBA-15 was added slowly and evenly, and vigorously stirred at room temperature for 6 hours. After the SBA-15 was completely dissolved, the sample was dried at 80°C for 18 hours;

[0055] (2) Grind the sample obtained after drying in step (1) to turn the block sample into powder, then raise the temperature to 550°C at 3°C / min, and calcinate at 550°C for 6h;

[0056] (3) Use 60mL 2M NaOH to remove SBA-15 from the sample obtained in step (2), and stir at room temperature for 5 days;

[0057] (4) Dilute the alkaline solution in ...

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Abstract

The invention provides a preparation method for a Pd-SnO2 nano composite material and application of the Pd-SnO2 nano composite material in a hydrogen gas sensor. The preparation method for the Pd-SnO2 nano composite material comprises the following steps: 1) sequentially adding a palladium chloride acid solution and a mesoporous molecular sieve into an alcohol solution of stannous chloride in sequence, and drying after uniformly drying to obtain a Pd-SnO2 composite material precursor; 2) roasting the Pd-SnO2 composite material precursor for 6 hours at a temperature of 550 DEG C, and removingthe mesoporous molecular sieve to obtain the Pd-SnO2 nano composite material. The preparation method provided by the invention is simple in process; by performing multi-time preparation material testand increasing a proportion to prepare a sample, the obtained nano composite material can stabilize gas-sensitive property to be 80% or higher; and on the premise of guaranteeing the gas-sensitive property of the material, the sample can be produced on a large scale, and therefore, the preparation method is suitable for industrial production.

Description

technical field [0001] The present invention relates to the technical field of gas sensing materials, more specifically, to a Pd-SnO 2 Preparation of nanocomposites and their application in hydrogen sensors. Background technique [0002] As we all know, hydrogen is a colorless, odorless, non-toxic, flammable and explosive gas. , chlorine, oxygen, carbon monoxide, and air mixtures can also cause explosions. Therefore, the development of various types of gas sensors is crucial to human life, production and other activities in the rapid and accurate detection of explosive hydrogen. Metal oxide semiconductor gas sensors have the advantages of simple structure, low price, high sensitivity, and rapid response. After long-term research and development, they are widely used in various industries such as the environment, food, and home improvement. However, it is difficult for a single semiconductor metal oxide to meet the above requirements, so composite oxide sensitive materials...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/407
CPCG01N27/4074
Inventor 周姣田陆
Owner 河北镭传科技有限责任公司
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