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Surface modified PD-SNO 2 Preparation method and application of microspheres

A surface modification, pd-sno2 technology, applied in the field of preparation of Pd-SnO2 microspheres, can solve the problems of limited application range and place of use, poor stability, poor selectivity, etc., and achieve simple use method and good crystallinity , the effect of simple method

Active Publication Date: 2020-06-16
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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  • Surface modified PD-SNO <sub>2</sub> Preparation method and application of microspheres
  • Surface modified PD-SNO <sub>2</sub> Preparation method and application of microspheres
  • Surface modified PD-SNO <sub>2</sub> Preparation method and application of microspheres

Examples

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Embodiment 1

[0032] The invention provides a surface modified Pd-SnO 2 Microspheres, its preparation method is specifically carried out according to the following steps:

[0033] (1) Mix 25mL deionized water and 25mL absolute ethanol as a solvent, weigh a certain amount of SnCl 4 ·5H 2 O is used as a raw material, and the raw material taken by weighing is added in the solvent and stirred to make it dissolve completely;

[0034] (2) Weigh a certain amount of PdCl 2 Add hydrochloric acid, ultrasonically dissolve, then add to the solution of step (1), and stir the obtained mixed solution at room temperature, wherein the molar ratio of tin tetrachloride to palladium in chloropalladium acid is 1:0.03;

[0035] (3) After the mixed solution in step 2 was stirred evenly, 0.1 mL of CTAB solution was added, and stirred vigorously at room temperature to obtain a precursor solution, wherein the molar ratio of tin tetrachloride to CTAB was 1:5;

[0036] (4) Transfer the precursor solution prepared ...

Embodiment 2

[0040] The invention provides a surface modified Pd-SnO2 Microspheres, its preparation method is specifically carried out according to the following steps:

[0041] (1) Mix 25mL deionized water and 25mL absolute ethanol as a solvent, weigh a certain amount of SnCl 4 ·5H 2 O is used as a raw material, and the raw material taken by weighing is added in the solvent and stirred to make it dissolve completely;

[0042] (2) Weigh a certain amount of PdCl 2 Add hydrochloric acid, sonicate and dissolve so that its palladium accounts for a mass percentage of 5%, then add in the solution of step (1), and the mixed solution obtained is stirred at room temperature; wherein, the mole of palladium in tin tetrachloride and chloropalladium acid The ratio is 1:0.05;

[0043] (3) After the mixed solution in step 2 was stirred evenly, 0.2mL of CTAB solution was added, and stirred vigorously at room temperature to obtain a precursor solution; wherein the molar ratio of tin tetrachloride to CTA...

experiment example 1

[0048] Surface-modified Pd-SnO in the above-mentioned embodiment 1 2 The application of microspheres is carried out as follows:

[0049] Surface-modified Pd-SnO 2 Microspheres are used as sensitive materials to prepare gas sensors. 2 to test;

[0050] The method for preparing the gas sensor is: the surface modified Pd-SnO 2 Put the microspheres in a mortar, add an appropriate amount of distilled water, and grind to obtain a uniform suspension, then spin-coat the suspension on the Au interdigitated electrode, and dry it in a blast drying oven at 80 °C for 4 h, that is, Get the gas sensor.

[0051] figure 1 It is the surface-modified Pd-SnO obtained in Example 1 2 The scanning electron microscope image of the microsphere shows that the material has a three-dimensional spherical morphology under the action of the surfactant CTAB, with an average diameter of about 1.2 μm. There are a large number of Pd nanoparticles on the surface of the sphere. These Pd nanoparticles Metal...

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Abstract

The invention provides a preparation method and application of a surface modified Pd-SnO2 microsphere. The preparation method of the surface modified Pd-SnO2 microsphere comprises the following stepsthat a palladium chloride acid solution and a CTAB solution are sequentially added into a stannic chloride solution, and a hydrothermal reaction is conducted for 20-24 hours at the temperature of 160-180 DEG C; the molar ratio of stannic chloride to palladium in palladium chloride acid is 1 to (0.01-0.009); and the molar ratio of stannic chloride to CTAB is 1 to (1-10). A CTAB surface modifying agent is used to conduct surface modification on a Pd-loading SnO2 nano material, and the surface modified Pd-SnO2 microsphere is obtained. The method is simple and easy to repeat, the obtained surfacemodified Pd-SnO2 microsphere is in a three-dimensional nano spherical shape, a great amount of Pd nano particles exist on the surface of the sphere, the catalytic sites of gas are increased which is conductive to adsorption and desorption of gas, and accordingly the gas sensibility is improved.

Description

technical field [0001] The invention relates to the technical field of gas sensing materials, more specifically, to a surface-modified Pd-SnO 2 Preparation method and application of microspheres. Background technique [0002] Hydrogen is a colorless, odorless, non-toxic, flammable and explosive gas. It is lighter than air. When it is used and stored indoors, the gas leaks and rises and stays and is not easy to discharge. It will cause an explosion when it encounters sparks. , oxygen, carbon monoxide, and air mixtures can also cause an explosion. 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 improv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G19/02B22F9/30B82Y30/00G01N27/12
CPCB22F9/30B82Y30/00C01G19/02C01P2002/72C01P2004/03C01P2004/32C01P2004/61C01P2004/80G01N27/127
Inventor 周姣田陆
Owner 河北镭传科技有限责任公司
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