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Hydrogen sensor based on Pd-Ag alloy nanocrystalline and preparation method of hydrogen sensor

A technology of alloy nanocrystals and sensors, applied in instruments, scientific instruments, measuring devices, etc., can solve the problems of easy poisoning and loss of activity of palladium metal

Pending Publication Date: 2020-10-30
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But a single palladium metal is easily poisoned and loses its activity

Method used

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  • Hydrogen sensor based on Pd-Ag alloy nanocrystalline and preparation method of hydrogen sensor
  • Hydrogen sensor based on Pd-Ag alloy nanocrystalline and preparation method of hydrogen sensor
  • Hydrogen sensor based on Pd-Ag alloy nanocrystalline and preparation method of hydrogen sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1: Pd 80 Ag 20Preparation of ZnO Nanowire Sensitive Material Modified by Alloy Nanocrystals and Its Hydrogen Sensitive Properties

[0041] 0.012g black Pd 80 Ag 20 The alloy nanocrystal solid was dispersed in 50 mL of n-hexane to obtain a Pd-Ag bimetallic alloy nanocrystal dispersion solution 1*.

[0042] Take 2mL of Pd-Ag bimetallic alloy nanocrystal dispersion solution 1* and 0.05g of zinc oxide nanowires and stir and mix for 1min, put them into an ultrasonic tester for ultrasonic treatment for 1min, and obtain the required Pd 80 Ag 20 ZnO nanowires modified by alloy nanocrystals as hydrogen sensitive materials.

[0043] A small amount of the Pd-Ag bimetallic alloy nanocrystal dispersion solution 1* prepared above was taken for TEM observation. Scanning electron microscope photographs showed figure 1 As shown, the transmission electron micrograph results are as follows figure 2 As shown, the diameter of the nanoparticles in the Pd-Ag bimetallic alloy ...

Embodiment 2

[0049] Example 2: Pd 50 Ag 50 Preparation of ZnO Nanowire Sensitive Material Modified by Alloy Nanocrystals and Its Hydrogen Sensitive Properties

[0050] 0.013g black Pd 50 Ag 50 The alloy nanocrystal solid was dispersed in 50 mL of n-hexane to obtain a Pd-Ag bimetallic alloy nanocrystal dispersion solution 2*.

[0051] Take 2mL of Pd-Ag bimetallic alloy nanocrystal dispersion solution 2* and 0.05g of zinc oxide nanowires and stir and mix for 1min, then put it into an ultrasonic tester and ultrasonically treat it for 1min to obtain the required Pd 50 Ag 50 ZnO nanowires modified by alloy nanocrystals as hydrogen sensitive materials.

[0052] A small amount of the Pd-Ag bimetallic alloy nanocrystal dispersion solution 2* prepared above was taken for TEM observation. The diameter of the nanoparticles in the Pd-Ag bimetallic alloy nanocrystal dispersion solution 2* is 5-8nm. As shown in Table 2, the energy spectrum analysis results of the Pd-Ag bimetallic alloy nanocrysta...

Embodiment 3

[0056] Example 3: Pd 80 Ag 20 Alloy Nanocrystal Modified SnO 2 Preparation of Nanowire Sensitive Materials and Their Hydrogen Sensitive Properties

[0057] Take 2mL of the Pd-Ag bimetallic alloy nanocrystal dispersion solution 1* as shown in Example 1 and mix with 0.05g tin oxide nanowires for 1min, put them into an ultrasonic tester and ultrasonically for 1min, and obtain the required Pd-Ag bimetallic alloy nanocrystal dispersion solution 1* and 0.05g tin oxide nanowires. The metal alloy nanocrystal modified tin oxide nanowire hydrogen sensitive material, and the sensitive material is coated on the comb electrode of the microsensor chip, and the required resistive hydrogen sensor 3# is prepared. The hydrogen sensor 3# is used for hydrogen detection, the results show that Pd 80 Ag 20 Alloy nanocrystals can significantly enhance the sensitivity of the hydrogen sensor to detect hydrogen.

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Abstract

The invention provides a hydrogen sensor based on Pd-Ag alloy nanocrystalline. The hydrogen sensor comprises a metal oxide sensitive material, wherein Pd-Ag alloy nanocrystalline particles are loadedon the surface of the metal oxide sensitive material. The invention further provides a preparation method and application of the hydrogen sensor based on the Pd-Ag alloy nanocrystalline. According tothe hydrogen sensor based on the Pd-Ag alloy nanocrystalline and the preparation method of the hydrogen sensor, the hydrogen detection sensitivity of the hydrogen sensor can be enhanced, and synergistic catalysis is realized; and the preparation method is simple and mature, easy to operate, low in price and advanced in application, has practical application significance, and has positive significance in detection of flammable and combustible gas and the like.

Description

technical field [0001] The invention belongs to the technical field of gas sensors, and relates to a novel hydrogen sensor and a preparation method thereof, in particular to a hydrogen sensor based on Pd-Ag alloy nanocrystals and a preparation method thereof. Background technique [0002] High-sensitivity detection of hydrogen is of great significance in a wide range of applications such as fuel cells, the semiconductor industry, and power plants. Due to the high flammability and explosiveness of hydrogen, it is necessary to develop high-performance hydrogen sensors. Although traditional metal oxide sensitive materials (such as zinc oxide) have certain sensitivity to hydrogen, their sensitivity and selectivity still cannot meet the requirements of hydrogen detection in the actual detection environment. [0003] Palladium catalysts are often used to improve the hydrogen-sensitivity performance of sensing materials. However, single palladium metal is easily poisoned and lose...

Claims

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Application Information

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IPC IPC(8): G01N27/12
CPCG01N27/127
Inventor 许鹏程徐东升李昕欣王雪晴于海涛陈滢
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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